def test_geometryexport(self):
expectedpoints_simple = ("POINT (1 1)", "POINT (2 2)", "POINT (3 3)",
"POINT (0.9 0.9)", "POINT (4 2)")
expectedlines_simple = ("LINESTRING (1 1,2 2)", "LINESTRING (2 2,3 3)",
"LINESTRING (0.9 0.9,4.0 0.9,4 2)")
expectedpoints = ("POINT (1 1)", "POINT (2 2)", "POINT (3 3)",
"POINT (0.9 0.9)", "POINT (4.0 0.9)", "POINT (4 2)")
expectedlines = ("LINESTRING (1 1,2 2)", "LINESTRING (2 2,3 3)",
"LINESTRING (0.9 0.9,4.0 0.9)",
"LINESTRING (4.0 0.9,4 2)")
tpath = os.path.join(tempfile.gettempdir(), 'shpdir')
G = nx.read_shp(self.shppath)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
self.checkgeom(shpdir.GetLayerByName("nodes"), expectedpoints_simple)
self.checkgeom(shpdir.GetLayerByName("edges"), expectedlines_simple)
# Test unsimplified
# Nodes should have additional point,
# edges should be 'flattened'
G = nx.read_shp(self.shppath, simplify=False)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
self.checkgeom(shpdir.GetLayerByName("nodes"), expectedpoints)
self.checkgeom(shpdir.GetLayerByName("edges"), expectedlines)
def nx_shp(shp_pts, shp_lines, site_col='site'):
"""
Function to import shapefiles into nx networks. The lines become the edges and the points are used as the node (names). The points shapefile should have a site name column that is precisely at the intersection of the shp_lines.
"""
## Read in shapefiles
t2 = nx.read_shp(shp_pts)
t3 = nx.read_shp(shp_lines)
## extract the site names
sites = [i[1][site_col] for i in t2.nodes(data=True)]
## Set up rename dictionaries
rename1 = {(i[0], i[1]): (round(i[0]), round(i[1])) for i in t3.nodes()}
rename2 = {(round(i[0][0]), round(i[0][1])): i[1]['site']
for i in t2.nodes(data=True)}
## Rename nodes
g2 = nx.relabel_nodes(t3, rename1)
g3 = nx.relabel_nodes(g2, rename2)
## Remove unnecessary nodes
remove1 = [g3.nodes()[i] for i in np.where(~np.in1d(g3.nodes(), sites))[0]]
g3.remove_nodes_from(remove1)
return g3
def run_script(iface):
catchment = []
r = 2000
i = 0
while i > len(cost):
if cost < r:
# next node
if cost(next) < r:
upperbound.append(i)
i = i + 1
G = nx.Graph() # creating an empty graph
nx.read_shp(str(iface.activeLayer().source()))
G.add_edge(1, 2, weight=4.7 )
M = nx.single_source_shortest_path_length(G,0,)
M = nx.ego_graph(G, (679980.26234586, 6059164.91455736), 1, center=True, undirected=False, distance=2000)
nx.write_shp()
layer = iface.mapCanvas().currentLayer()
for f in layer.getFeatures():
geom = f.geometry()
G.add_node(geom)
def shortest_distance(rp, calc_path, road_path, communes_TH, places_TH,
spatial_places):
if rp is not 'no_flood':
# read path to save new shapefile
flooded_road_path = os.path.join(
calc_path, 'Thanh_Hoa_river_flooded_roads_%s.shp' % rp)
# load network
sg = nx.read_shp(flooded_road_path).to_undirected()
else:
g = nx.read_shp(road_path)
sg = max(nx.connected_component_subgraphs(g.to_undirected()), key=len)
commune_dist = {}
for id_, commune in communes_TH.iterrows():
# find nearest points of interest (places in this case)
nearest_places = places_TH.iloc[list(
spatial_places.nearest(commune.geometry.bounds, 3))]
k = 0
for idplace, place in nearest_places.iterrows():
# Compute the shortest path based on travel time
try:
path = nx.shortest_path(sg,
source=tuple(commune['nearest_node']),
target=tuple(place['nearest_node']),
weight='t_time')
except:
path = []
# save path
if len(path) == 1:
distance = 0
elif len(path) == 0:
distance = 9999
else:
distance = pd.DataFrame(
[sg[path[i]][path[i + 1]] for i in range(len(path) - 1)],
columns=['length']).sum()[0]
if k == 0:
shortest_distance = distance
else:
if distance < shortest_distance:
shortest_distance = distance
k += 1
commune_dist[commune['commune_id']] = shortest_distance
# create dataframe of distances
commune_dist = pd.DataFrame.from_dict(commune_dist, orient='index')
commune_dist.columns = [rp]
return commune_dist
def testload(self):
expected = nx.DiGraph()
for p in self.paths:
expected.add_path(p)
actual = nx.read_shp(self.shppath)
assert_equal(sorted(expected.node), sorted(actual.node))
assert_equal(sorted(expected.edges()), sorted(actual.edges()))
def buildNetwork(self):
'''Method to create NetworkX nodes and edges shapefiles.'''
try:
layer = str(self.filelist[self.ui.comboBoxInput.currentIndex()])
if layer == "Available layers:":
raise IOError, "Please specify input shapefile layer."
DG1 = nx.read_shp(layer)
if str(self.ui.lineEditSave.text()) == '':
raise IOError, "No output directory specified."
WriteNetworkShapefiles(DG1, self.fd, overwrite=True)
#self.writeNetworkShapefiles(DG1)
if self.ui.checkBoxAdd.isChecked():
# Get created files
nodes = self.fd+"/nodes.shp"
edges = self.fd+"/edges.shp"
# Add to QGIS instance
qgis.utils.iface.addVectorLayer(edges, "Network Edges", "ogr")
qgis.utils.iface.addVectorLayer(nodes, "Network Nodes", "ogr")
self.close()
except (AttributeError, IOError) as e:
QtGui.QMessageBox.warning( self, "NetworkX Plugin Error",
"%s" % e)
def shp_adj(networkShp):
G = nx.read_shp(networkShp)
mat = nx.adjacency_matrix(G)
maxNumConn = max((mat).sum(1))
connectionMat = np.zeros(shape=(mat.shape[0], maxNumConn))
for i in xrange(mat.shape[0]):
noZero = np.nonzero(mat[i])
z = np.asarray(noZero[1])
connectionMat[i, 0:z.shape[0]] = (z[0:z.shape[0]] + 1)
shpAdj = np.zeros(shape=(len(G.nodes()), maxNumConn * 2 + 5))
Gnodes = np.array(G.nodes())
shpAdj[:, 0] = range(1, len(G.nodes()) + 1)
shpAdj[:, 1] = Gnodes[:, 0]
shpAdj[:, 2] = Gnodes[:, 1]
for i in xrange(maxNumConn):
shpAdj[:, 3 + i] = connectionMat[:, i]
nonZero = np.nonzero(shpAdj[:, 3 + i])
shpAdj[nonZero[0], 5 + i + maxNumConn] = haversine(
shpAdj[nonZero[0], 1], shpAdj[nonZero[0], 2],
shpAdj[(shpAdj[nonZero[0], 3 + i] - 1).astype(int),
1], shpAdj[(shpAdj[nonZero[0], 3 + i] - 1).astype(int), 2])
#np.savetxt(resultsFolder+'network-shpAdj.txt', shpAdj, fmt='%i %f %f %i %i %i %i %i %i %i %f %f %f %f %f', delimiter=',')
return shpAdj, maxNumConn
def updateContourEdgeInfo(urlShpFile, graphPicklePath):
roadGraphd = nx.read_shp(urlShpFile)
roadGraph = roadGraphd.to_undirected()
_edgeList = nx.to_edgelist(roadGraph)
contourAttribute = dict()
# spline parameters
s=0.0 # smoothness parameter
k=4 # spline order
for _edge in _edgeList:
_edgePts = getEdgePoints(_edge)
_r = [item[0] for item in _edgePts]
_c = [item[1] for item in _edgePts]
# _r2,_c2 = getUniformSampledPoints(_r,_c)
_r2,_c2 = getMeasuredSamplePoints(_r,_c)
x = _r2
y = _c2
# M = 2*( len(x) + k)
M = len(x)
if M <= k:
M = 2*k
t = np.linspace(0, len(x), M)
x = np.interp(t, np.arange(len(x)), x)
y = np.interp(t, np.arange(len(y)), y)
z = t
# find the knot points
tckp,u = splprep([x,y,z],s=s,k=k,nest=-1)
# evaluate spline, including interpolated points
xnew,ynew,znew = splev(linspace(0,1,M),tckp)
dx,dy,dz = splev(linspace(0,1,M), tckp, der=1)
slp = []
cnv = 180/ np.pi
for i in xrange(len(dx)):
slp.append(np.arctan((dy[i]/dx[i]))*cnv )
pass
# quantize the slope and assign to edge descriptor list
roadLetFeat = []
for elem in slp:
feat = genFeat(elem, _alphabetSize)
roadLetFeat.append(feat)
pass
contourAttribute[(_edge[0],_edge[1])] = roadLetFeat
pass
nx.set_edge_attributes(roadGraph, 'contour', contourAttribute)
nx.write_gpickle(roadGraph, graphPicklePath)
pass
def shp_to_G(shp_file):
'''Ingest G from shapefile
DOES NOT APPEAR TO WORK CORRECTLY'''
G = nx.read_shp(shp_file)
return G
def test_geometryexport(self):
def testgeom(lyr, expected):
feature = lyr.GetNextFeature()
actualwkt = []
while feature:
actualwkt.append(feature.GetGeometryRef().ExportToWkt())
feature = lyr.GetNextFeature()
assert_equal(sorted(expected), sorted(actualwkt))
expectedpoints = (
"POINT (1 1)",
"POINT (2 2)",
"POINT (3 3)",
"POINT (0.9 0.9)",
"POINT (4 2)"
)
expectedlines = (
"LINESTRING (1 1,2 2)",
"LINESTRING (2 2,3 3)",
"LINESTRING (0.9 0.9,4 2)"
)
tpath = os.path.join(tempfile.gettempdir(),'shpdir')
G = nx.read_shp(self.shppath)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
testgeom(shpdir.GetLayerByName("nodes"), expectedpoints)
testgeom(shpdir.GetLayerByName("edges"), expectedlines)
def showShpFileData(shpFileURL):
shpData = nx.read_shp(shpFileURL)
shpData = shpData.to_undirected()
print shpData.nodes(data=True)
for edge in shpData.edges(data=True):
print edge
nodeList = shpData.nodes(data=True)
nNode = len(nodeList)
pos = []
for i in xrange(nNode):
pos.append(nodeList[i][0])
pass
shpLayout = dict(zip(shpData, pos))
plt.figure(1)
nx.draw_networkx_edges(shpData,
pos=shpLayout,
edgelist=None,
width=1,
edge_color='b',
style='-',
alpha=0.5)
nx.draw_networkx_nodes(shpData, pos=shpLayout, nodelist=None, node_size=2)
print len(shpData.nodes(data=False))
print len(shpData.edges(data=False))
plt.show()
def shortestpath(STlist, filename, cwd):
if len(STlist) >= 2:
#SETup part for this function, it read in the the road shapefile, but only store four bounding
#box value
shxFile = open(filename + ".shx", "rb")
s = shxFile.read(28)
header = struct.unpack(">iiiiiii", s) # convert into 7 integers
s = shxFile.read(72)
header2 = struct.unpack("<iidddddddd", s)
minX, minY, maxX, maxY = header2[2], header2[3], header2[4], header2[5]
Arcxylist = []
windowWidth, windowHeight = 800, 600 # define window size
#calculate the ratio, same as 'openFile' function
ratiox = (maxX - minX) / windowWidth
ratioy = (maxY - minY) / windowHeight
ratio = ratiox
if ratioy > ratio:
ratio = ratioy
dsc = arcpy.Describe(filename + ".shp")
coord_sys = dsc.spatialReference
#The for loop below will convert Tkinter coordinates into Arcgis-real-world coorinates
for i in range(1, len(STlist), 2):
Arcxylist.append([
minX + STlist[i - 1][0] * ratio,
maxY - STlist[i - 1][1] * ratio
]) #[minX + source.x* ratio, maxY + source.y* ratio]
Arcxylist.append(
[minX + STlist[i][0] * ratio, maxY - STlist[i][1] * ratio])
#set up a relative small distance to compare
minD = 10000000
minD2 = 10000000
G = nx.read_shp("main_road_separte.shp")
Conlist = list(nx.connected_component_subgraphs(G.to_undirected()))
g = Conlist[0]
nodelist = g.nodes(data=True)
nodelist2 = g.nodes(data=True)
source = target = ()
for nodes in nodelist:
distance = Eucl(nodes[0][0], nodes[0][1], Arcxylist[i - 1][0],
Arcxylist[i - 1][1])
if distance < minD:
minD = distance
source = nodes[0]
for nodes2 in nodelist2:
distance2 = Eucl(nodes2[0][0], nodes2[0][1], Arcxylist[i][0],
Arcxylist[i][1])
if distance2 < minD2:
minD2 = distance2
target = nodes2[0]
result_graph = g.subgraph(nx.shortest_path(g, source, target))
directory = cwd + "sss" + "a" * i
if not os.path.exists(directory):
os.makedirs(directory)
nx.write_shp(result_graph, directory)
arcpy.DefineProjection_management(directory + "\\edges.shp",
coord_sys)
openFile(directory + "\\edges.shx", directory + "\\edges.shp",
"black")
else:
print "Selected Points not enough"
def randomWalk(urlShpFile):
roadGraph = nx.read_shp(urlShpFile)
# use two random nodes in the graph and generate shortest path between them as vehicle trace
nodeList = roadGraph.nodes(data=False)
nNode = len(nodeList)
trace = []
_node = random.choice(nodeList)
visited = []
count = 0
while count < 10:
_neighbors = [x for x in nx.all_neighbors(roadGraph, _node)]
_neighbor = random.choice(_neighbors)
while _neighbor in visited:
pass
if not _neighbor in trace:
trace.append(_neighbor)
count += 1
_node = _neighbor
print trace
pass
def mysubgraph(_urlShpFile):
roadGraphd = nx.read_shp(_urlShpFile)
roadGraph = roadGraphd.to_undirected()
nodeList = roadGraph.nodes(data=True)
_nodeList = roadGraph.nodes(data=False)
nNode = len(nodeList)
pos = []
for i in xrange(nNode):
pos.append(nodeList[i][0])
pass
shpLayout = dict(zip(roadGraph, pos))
_node1 = random.choice(_nodeList)
_node2 = random.choice(_nodeList)
_path = nx.astar_path(roadGraph, _node1, _node2, None)
subG = nx.subgraph(roadGraph, _path)
plt.figure(1, figsize=(12, 12))
nx.draw_networkx(subG,
pos=shpLayout,
edgelist=None,
node_size=40,
node_color='r',
node_shape='d',
edgewidth=10,
edge_color='r',
with_labels=False)
plt.show()
def roadNetStats(_urlShpFile):
roadGraphd = nx.read_shp(_urlShpFile)
roadGraph = roadGraphd.to_undirected()
print "graph has been read"
nodeList = roadGraph.nodes(data=True)
_nodeList = roadGraph.nodes(data=False)
nNode = len(nodeList)
pos = []
for i in xrange(nNode):
pos.append(nodeList[i][0])
pass
shpLayout = dict(zip(roadGraph, pos))
print "number of nodes: " + str(nx.number_of_nodes(roadGraph))
print "number of edges: " + str(nx.number_of_edges(roadGraph))
neighborCount = {}
for node in _nodeList:
neighbors = list(nx.all_neighbors(roadGraph, node))
n = len(neighbors)
if neighborCount.has_key(n):
neighborCount[n] += 1
pass
else:
neighborCount[n] = 1
pass
for item in neighborCount.keys():
print item, ":", neighborCount[item]
pass
def testload(self):
expected = nx.DiGraph()
for p in self.paths:
expected.add_path(p)
actual = nx.read_shp(self.shppath)
assert_equal(sorted(expected.node), sorted(actual.node))
assert_equal(sorted(expected.edges()), sorted(actual.edges()))
def getNetworkGraph(shapefile, segmentlengths):
g = nx.read_shp(shapefile)
sg = g.to_undirected()
for n0, n1 in sg.edges_iter():
oid = int(sg[n0][n1]["OBJECTID"])
sg.edge[n0][n1]['length'] = segmentlengths[oid]
return sg
def shp2rnet(args):
graph = networkx.read_shp(args["shape_file"])
edges = list(graph.edges)
nodes = {}
node_id = 0
edge_id = 0
with open(args["out"], 'w') as f_out:
for edge in edges:
from_lng = edge[0][0]
from_lat = edge[0][1]
to_lng = edge[1][0]
to_lat = edge[1][1]
from_key = str(from_lng) + "-" + str(from_lat)
to_key = str(to_lng) + "-" + str(to_lat)
if from_key not in nodes:
nodes[from_key] = node_id
node_id+=1
if to_key not in nodes:
nodes[to_key] = node_id
node_id+=1
from_id = nodes[from_key]
to_id = nodes[to_key]
row = "{} {} {} {} {} {} {}\n".format(edge_id, from_id, to_id,
from_lng, from_lat, to_lng, to_lat)
f_out.write(row)
edge_id+=1
def load_shp(shp_path):
""" loads a shapefile into a networkx based GeoGraph object
Args:
shp_path: string path to a line or point shapefile
Returns:
geograph: GeoGraph
"""
# NOTE: if shp_path is unicode io doesn't work for some reason
shp_path = shp_path.encode('ascii', 'ignore')
g = nx.read_shp(shp_path)
coords = dict(enumerate(g.nodes()))
driver = ogr.GetDriverByName('ESRI Shapefile')
shp = driver.Open(shp_path)
layer = shp.GetLayer()
spatial_ref = layer.GetSpatialRef()
proj4 = None
if not spatial_ref:
if gm.is_in_lon_lat(coords):
proj4 = gm.PROJ4_LATLONG
else:
warnings.warn("Spatial Reference could not be set for {}".
format(shp_path))
else:
proj4 = spatial_ref.ExportToProj4()
g = nx.convert_node_labels_to_integers(g)
return GeoGraph(srs=proj4, coords=coords, data=g)
def neighorCount(urlShpFile):
roadGraph = nx.read_shp(urlShpFile)
nodeList = roadGraph.nodes(data=False)
nNode = len(nodeList)
print nNode
edgesLst = nx.to_edgelist(roadGraph)
print len(edgesLst)
nodeNeighorhood = dict()
neighborhoodSize = dict()
nsize = [x for x in xrange(15)]
for i in nsize:
neighborhoodSize[i] = 0
pass
singleNeighborNodeList = []
for _node in nodeList:
_neighbors = [x for x in nx.all_neighbors(roadGraph, _node)]
if not _node in nodeNeighorhood:
nNeighbor = len(_neighbors)
nodeNeighorhood[_node] = nNeighbor
neighborhoodSize[nNeighbor] += 1
pass
pass
for key in neighborhoodSize.keys():
print key, '\t:', neighborhoodSize[key]
pass
pass
def save_graph_pickle(shp_file, pickle_name):
G = nt.read_shp(shp_file)
G_un = G.to_undirected()
with open(pickle_name, 'wb') as file:
pickle.dump(G_un, file)
return
def roadData2():
roadGraph = nx.read_shp(urlShpFile)
nodeList = roadGraph.nodes(data=False)
nNode = len(nodeList)
_node = random.choice(nodeList)
_nodeEdgeList = nx.edges(roadGraph, _node)
count = 0
while (len(_nodeEdgeList) < 2):
_node = random.choice(nodeList)
_nodeEdgeList = nx.edges(roadGraph, _node)
count += 1
print _nodeEdgeList
_nodeEdgeLst = nx.to_edgelist(roadGraph, _node)
for _edge in _nodeEdgeLst:
_edgePts = getEdgePoints(_edge)
print _edgePts
edgePointsLst = []
for roadEdge in _nodeEdgeLst:
edgePointPairLst = getEdgePoints(roadEdge)
edgePointsLst.append(edgePointPairLst)
dispNodeEdgeGraph(edgePointsLst)
pass
def roadData1():
roadGraph = nx.read_shp(urlShpFile)
roadEdgeList = nx.to_edgelist(roadGraph)
_flag = True
for roadEdge in roadEdgeList:
while _flag:
print roadEdge[0]
print roadEdge[1]
roadEdgeData = roadEdge[2]
edgeKeyList = roadEdgeData.keys()
for edgeKey in edgeKeyList:
print edgeKey
print roadEdgeData[edgeKey]
pass
edgePointStr = roadEdgeData['Wkt']
b1 = edgePointStr.find('(')
b2 = edgePointStr.find(')')
edgePointsSubStr = edgePointStr[b1 + 1:b2]
print edgePointsSubStr
edgePointPairStrLst = edgePointsSubStr.split(',')
edgePointPairLst = []
for edgePointPairStr in edgePointPairStrLst:
edgePointPair = [float(x) for x in edgePointPairStr.split(' ')]
edgePointPairLst.append(edgePointPair)
pass
# coordinates of points in an edge
for _item in edgePointPairLst:
print _item
pass
_flag = False
pass
def roadData():
roadGraph = nx.read_shp(urlShpFile)
nodeList = roadGraph.nodes(data=False)
nNode = len(nodeList)
qnodeList = []
for i in xrange(1):
qnodeList.append(random.choice(nodeList))
pass
print 'qnodelist', qnodeList
roadEdgeList = nx.to_edgelist(roadGraph, qnodeList)
_flag = 10
for roadEdge in roadEdgeList:
if _flag:
edgePointPairLst = getEdgePoints(roadEdge)
nAlpha = [float(x) for x in roadEdge[0]]
nOmega = [float(x) for x in roadEdge[1]]
# print nAlpha
# print nOmega
# for edgePointPair in edgePointPairLst:
# print edgePointPair
# pass
edgePoints = []
edgePoints.append(nAlpha)
for edgePointPair in edgePointPairLst:
edgePoints.append(edgePointPair)
pass
edgePoints.append(nOmega)
dispEdgeGraph(edgePoints)
_flag -= 1
pass
pass
def graph_from_shp(pth=r'test_processed_01',
idcol='facilityid',
crs={'init': 'epsg:4326'}):
#import well-known-text load func
from shapely import wkt
G = nx.read_shp(pth)
G.graph['crs'] = crs
G = nx.convert_node_labels_to_integers(G, label_attribute='coords')
for u, v, d in G.edges(data=True):
#create a shapely line geometry object
d['geometry'] = wkt.loads(d['Wkt'])
d['length'] = d['geometry'].length
#get rid of other geom formats
del d['Wkb'], d['Wkt'], d['Json']
#generate a uniq id if necessary
if idcol not in d:
d[idcol] = generate_facility_id()
return G
def __init__(self, file_path, coastline_shp=None, calc_dist_weights=True):
"""
Build a graph from a shapefile and provide methods to prune, or read
a gpickle file and convert it to a `RiverGraph`.
"""
if os.path.exists(file_path) == True and os.path.isfile(
file_path) == True:
self.coast_fn = coastline_shp
if os.path.splitext(file_path)[1] == '.shp':
g = nx.read_shp(file_path)
elif os.path.splitext(file_path)[1] == '.graphml':
g = nx.read_graphml(file_path)
elif os.path.splitext(file_path)[1] == '.gpickle':
g = nx.read_gpickle(file_path)
else:
#assert False, "path does not have a valid extention (.shp, .graphml, .gpickle): %s" % file_path
print "path does not have a valid extension (.shp, .graphml, .gpickle)"
self.graph = RiverGraph(data=g, coastline_shp=self.coast_fn)
if calc_dist_weights:
print "Weighting Edges with Distances"
self.graph = self.graph.weight_edges()
else:
if os.path.exists(file_path) == False:
print "file does not exist"
if os.path.isfile(file_path) == False:
print "path is not a file or does not exist: %s" % file_path
def preprocessRoutes(routeFile):
edges = nx.read_shp(routeFile)
posNodes = pre.getPositionOfNodesFromEdges(edges)
posEdges = pre.getPositionOfEdges(edges)
edg = pre.getEdges(posEdges,posNodes)
network = pre.createNetwork(posNodes,edg)
return network
def readGraph(csadir, method):
"""
Load the graph network and line shapefiles and combine both to construct a graph data model.
First, nodes are loaded from the network shp, then the relations between the nodes is extracted from the lines shp.
:param csadir: folder to find shapefiles
:param method: subfolder indicating which method to use. One of ['Addnode', 'Steiner-like', 'Closestnode']
:return: graph
"""
dir = '{}{}/'.format(csadir, method)
graph = loadFiles(dir, 'NWB')['NWB']
atts = graph[1]
# Read the network shp and convert to undirected graph
print ">> Reading graph..."
G = nx.read_shp('{}network.shp'.format(dir), simplify=True)
SG = G.to_undirected()
# Create mapping dictionary for relabeling of nodes
mapping = {node: int(a['Id']) for (node, a) in SG.nodes(data=True)}
# Relabel nodes with IDs from shapefile for adding edges
print ">> Relabeling nodes..."
nx.relabel_nodes(SG, mapping, copy=False)
ebunch = [(int(u), int(v), float(w)) for i, u, v, w in atts]
print ">> Adding edges to graph..."
SG.add_weighted_edges_from(ebunch)
# nx.write_gml(SG, '{}test.gml'.format(dir), stringify)
return SG
def parseGraph(urlShpFile):
roadGraphd = nx.read_shp(urlShpFile)
roadGraph = roadGraphd.to_undirected()
# roadGraph = nx.read_shp(urlShpFile)
# roadGraph = list(nx.connected_component_subgraphs(roadGraph.to_undirected()))[0]
nodeLst = roadGraph.nodes(data=False)
roadEdgeList = nx.to_edgelist(roadGraph)
weightAttribute = dict()
for roadEdge in roadEdgeList:
weightAttribute[(roadEdge[0], roadEdge[1])] = 1
pass
nx.set_edge_attributes(roadGraph, 'weight', weightAttribute)
for node in nodeLst:
_n = roadGraph.neighbors(node)
print len(_n), node
if (len(_n) > 4):
findTree(roadGraph, node)
# findmst(roadGraph, node)
pass
def test():
import networkx as nx
import pandas as pd
bj_roads = r'data/test/bj_small_roads_sample/bj_small_roads_sample.shp'
bj_speeds = r'data/roads-20180801-20180831.parquet'
road_net = nx.read_shp(bj_roads)
edges = EdgesLookup(
[(GeneralNode(None, o, None, None), GeneralNode(
None, d, None, None), float(road_net.edges[(o, d)]['length']))
for o, d in road_net.edges], lambda a, _: a)
since = time.perf_counter()
res = edges.k_shortest_path(
GeneralNode(None, (116.331194, 39.957388), None, None),
GeneralNode(None, (116.417038, 40.002861), None, None), 0)
print('since', time.perf_counter() - since)
print(*map(lambda i: (i[0], i[1][:5]), res), sep='\n')
edges = gen_dynamic_edges(road_net, pd.read_parquet(bj_speeds))
for _ in range(3):
ts = random.randint(0, 24 * 60 * 60)
since = time.perf_counter()
res = edges.k_shortest_path(
GeneralNode(None, (116.331194, 39.957388), None, None),
GeneralNode(None, (116.417038, 40.002861), None, None), ts)
print('since', time.perf_counter() - since)
print(*map(lambda i: (i[0], i[1][:5]), res), sep='\n')
def convert_shp_to_graph(input_shp, directed, multigraph, parallel_edges_attribute):
"""Converts a shapefile to networkx graph object in accordance to the given parameters.
It can directed or undirected, simple graph or multigraph
Parameters
----------
input_shp: shapefile path
directed: 'true' or 'false'
If value is true – directed graph will be created.
If value is false - undirected graph will be created
multigraph: 'true' or 'false'
If value is true – multigraph will be created
If value is false – simple graph will be created
parallel_edges_attribute: string
Field of the shapefile which allows to distinguish parallel edges.
Note that it could be a field of different types, but all values of this attribute should be filled
Returns
-------
Graph
"""
if multigraph == 'true':
G = nx_multi_shp.read_shp(r'{0}'.format(input_shp), parallel_edges_attribute, simplify=True,
geom_attrs=True, strict=True)
else:
G = nx.read_shp(r'{0}'.format(input_shp))
if directed == 'true':
graph = G
else:
graph = G.to_undirected()
return graph
def read_network_graph_from_file(filename, is_directed=False):
"""Get network graph from filename.
Args:
filename (str): A name of a geo dataset resource recognized by Fiona package.
is_directed (bool, optional (Defaults to False)): Graph type. True for directed Graph,
False for Graph.
Returns:
obj, dict: Graph and node coordinates.
"""
geom = nx.read_shp(filename)
node_coords = {k: v for k, v in enumerate(geom.nodes())}
# create graph
graph = None
if is_directed:
graph = nx.DiGraph()
else:
graph = nx.Graph()
graph.add_nodes_from(node_coords.keys())
l = [set(x) for x in geom.edges()]
edg = [tuple(k for k, v in node_coords.items() if v in sl) for sl in l]
graph.add_edges_from(edg)
return graph, node_coords
def init(shp_path, civici_tpn_path, coords_path):
G = nt.read_shp(shp_path)
G_un = G.to_undirected()
civici_tpn = np.loadtxt(civici_tpn_path, delimiter=";", dtype='str')
coords = np.loadtxt(coords_path)
return G_un, civici_tpn, coords
def from_files(cls, shp, csv, **kwargs):
"""
Parameters
----------
shp : file or string (File, directory, or filename to read).
csv : string or file handle / StringIO.
Example
----------
NetworkPlan.from_files('networks-proposed.shp',
'metrics-local.csv')
"""
# Only supports longlat format for now
# with fiona.open(shp) as shapefile:
# # Pass along the projection
# if 'proj' in shapefile.crs:
# kwargs['proj'] = shapefile.crs['proj']
# Ignore the PROJ.4 header if there
skip_rows = 0
with open(csv) as csv_stream:
if csv_stream.readline().startswith('PROJ.4'):
skip_rows = 1
# networkx read_shp fails on unicode paths, so try ascii
if isinstance(shp, unicode):
shp = shp.encode("ascii")
return cls(nx.read_shp(shp), pd.read_csv(csv, skiprows=skip_rows), **kwargs)
def testload(self):
expected = nx.DiGraph()
map(expected.add_path, self.paths)
G = nx.read_shp(self.shppath)
assert_equal(sorted(expected.node), sorted(G.node))
assert_equal(sorted(expected.edges()), sorted(G.edges()))
names = [G.get_edge_data(s,e)['Name'] for s,e in G.edges()]
assert_equal(self.names, sorted(names))
def test_geometryexport(self):
expectedpoints_simple = (
"POINT (1 1)",
"POINT (2 2)",
"POINT (3 3)",
"POINT (0.9 0.9)",
"POINT (4 2)"
)
expectedlines_simple = (
"LINESTRING (1 1,2 2)",
"LINESTRING (2 2,3 3)",
"LINESTRING (0.9 0.9,4.0 0.9,4 2)"
)
expectedpoints = (
"POINT (1 1)",
"POINT (2 2)",
"POINT (3 3)",
"POINT (0.9 0.9)",
"POINT (4.0 0.9)",
"POINT (4 2)"
)
expectedlines = (
"LINESTRING (1 1,2 2)",
"LINESTRING (2 2,3 3)",
"LINESTRING (0.9 0.9,4.0 0.9)",
"LINESTRING (4.0 0.9,4 2)"
)
tpath = os.path.join(tempfile.gettempdir(), 'shpdir')
G = nx.read_shp(self.shppath)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
self.checkgeom(shpdir.GetLayerByName("nodes"), expectedpoints_simple)
self.checkgeom(shpdir.GetLayerByName("edges"), expectedlines_simple)
# Test unsimplified
# Nodes should have additional point,
# edges should be 'flattened'
G = nx.read_shp(self.shppath, simplify=False)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
self.checkgeom(shpdir.GetLayerByName("nodes"), expectedpoints)
self.checkgeom(shpdir.GetLayerByName("edges"), expectedlines)
def testload(self):
def compare_graph_paths_names(g, paths, names):
expected = nx.DiGraph()
for p in paths:
expected.add_path(p)
assert_equal(sorted(expected.node), sorted(g.node))
assert_equal(sorted(expected.edges()), sorted(g.edges()))
g_names = [g.get_edge_data(s, e)['Name'] for s, e in g.edges()]
assert_equal(names, sorted(g_names))
# simplified
G = nx.read_shp(self.shppath)
compare_graph_paths_names(G, self.simplified_paths, \
self.simplified_names)
# unsimplified
G = nx.read_shp(self.shppath, simplify=False)
compare_graph_paths_names(G, self.paths, self.names)
def shp_to_graph(shp_path):
graph_shp = nx.read_shp(str(shp_path))
shp = QgsVectorLayer(shp_path, "network", "ogr")
# parallel edges are excluded of the graph because read_shp does not return a multi-graph, self-loops are included
#self_loops = [[feat.id(), feat.geometry().asPolyline()[0],feat.attributes()]for feat in shp.getFeatures() if feat.geometry().asPolyline()[0] == feat.geometry().asPolyline()[-1] ]
# parallel_edges =
graph = graph_shp.to_undirected(reciprocal=False)
#column_names = [i.name() for i in shp.pendingFields()]
#for i in self_loops:
# graph.add_edge(i[1],i[1],dict(zip(column_names,i[2])))
return graph
def __init__(self, shapefile, edge_weighted_by_distance=True):
g = nx.read_shp(shapefile)
mg = max(nx.connected_component_subgraphs(g.to_undirected()), key=len)
if edge_weighted_by_distance:
for n0, n1 in mg.edges_iter():
path = np.array(json.loads(mg[n0][n1]['Json'])['coordinates'])
distance = np.sum(
greate_circle_distance(path[1:,0],path[1:,1], path[:-1,0], path[:-1,1])
)
mg.edge[n0][n1]['distance'] = distance
self.graph = mg
self._cache = {}
self._cache_nn = {}
def test_attributeexport(self):
def testattributes(lyr, expected):
feature = lyr.GetNextFeature()
actualvalues = []
while feature:
actualvalues.append(feature.GetGeometryRef().ExportToWkt())
feature = lyr.GetNextFeature()
assert_equal(sorted(expected), sorted(actualvalues))
tpath = os.path.join(tempfile.gettempdir(),'shpdir')
G = nx.read_shp(self.shppath)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
nodes = shpdir.GetLayerByName("nodes")
def mappingOneDay():
for i in range(13340):
try:
g = nx.read_shp('./Graph/edges.shp')
G = nx.Graph()
G.add_edges_from(g.edges())
filename = './data/' + str(i) + '.txt'
Graph = MapReader().mapGraph
mappingOneTaxi(filename, Graph, G)
del g
del G
except Exception,e:
fp = open('log_taxi.txt','a')
fp.write(str(e)+'\n'+str(i)+'.txt'+'\n')
fp.close()
def read_shp_to_graph(shp_path):
graph_shp = nx.read_shp(str(shp_path), simplify=True)
shp = QgsVectorLayer(shp_path, "network", "ogr")
graph = nx.MultiGraph(graph_shp.to_undirected(reciprocal=False))
# parallel edges are excluded of the graph because read_shp does not return a multi-graph, self-loops are included
all_ids = [i.id() for i in shp.getFeatures()]
ids_incl = [i[2]['feat_id'] for i in graph.edges(data=True)]
ids_excl = set(all_ids) - set(ids_incl)
request = QgsFeatureRequest().setFilterFids(list(ids_excl))
excl_features = [feat for feat in shp.getFeatures(request)]
ids_excl_attr = [[i.geometry().asPolyline()[0], i.geometry().asPolyline()[-1], i.attributes()] for i in excl_features]
column_names = [i.name() for i in shp.dataProvider().fields()]
for i in ids_excl_attr:
graph.add_edge(i[0], i[1], attr_dict=dict(zip(column_names,i[2])))
return graph
def test_missing_attributes(self):
G = nx.DiGraph()
A = (0, 0)
B = (1, 1)
C = (2, 2)
G.add_edge(A, B, foo=100)
G.add_edge(A, C)
nx.write_shp(G, self.path)
H = nx.read_shp(self.path)
for u, v, d in H.edges(data=True):
if u == A and v == B:
assert_equal(d['foo'], 100)
if u == A and v == C:
assert_equal(d['foo'], None)
def test_geometryexport(self):
expectedpoints = (
"POINT (1 1)",
"POINT (2 2)",
"POINT (3 3)",
"POINT (0.9 0.9)",
"POINT (4 2)"
)
expectedlines = (
"LINESTRING (1 1,2 2)",
"LINESTRING (2 2,3 3)",
"LINESTRING (0.9 0.9,4 2)"
)
tpath = os.path.join(tempfile.gettempdir(),'shpdir')
G = nx.read_shp(self.shppath)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
self.checkgeom(shpdir.GetLayerByName("nodes"), expectedpoints)
self.checkgeom(shpdir.GetLayerByName("edges"), expectedlines)
def test_attributeexport(self):
def testattributes(lyr, graph):
feature = lyr.GetNextFeature()
while feature:
coords = []
ref = feature.GetGeometryRef()
last = ref.GetPointCount() - 1
edge_nodes = (ref.GetPoint_2D(0), ref.GetPoint_2D(last))
name = feature.GetFieldAsString('Name')
assert_equal(graph.get_edge_data(*edge_nodes)['Name'], name)
feature = lyr.GetNextFeature()
tpath = os.path.join(tempfile.gettempdir(), 'shpdir')
G = nx.read_shp(self.shppath)
nx.write_shp(G, tpath)
shpdir = ogr.Open(tpath)
edges = shpdir.GetLayerByName("edges")
testattributes(edges, G)
def __init__(self, shp, csv, **kwargs):
self.shp_p, self.csv_p = shp, csv
self.priority_metric = kwargs['prioritize'] if 'prioritize' in kwargs else 'population'
# logger.info('Asserting Input Projections Match')
# self._assert_proj_match(shp, csv)
from geometryIO import load
proj4 = load(shp)[0]
self.measure = 'haversine' if 'longlat' in proj4 else 'euclidean'
# Load in and align input data
logger.info('Aligning Network Nodes With Input Metrics')
self._network, self._metrics = prep_data( nx.read_shp(shp),
# pd.read_csv(csv, header=1),
pd.read_csv(csv),
loc_tol = self.TOL)
logger.info('Computing Pairwise Distances')
self.distance_matrix = self._distance_matrix()
if len(self.distance_matrix[(self.distance_matrix > 0) & (self.distance_matrix < self.TOL)]) > 0:
logger.error("""Dataset Contains Edges, Less Than {tolerance} Meters!
This can result in incorrect alignment of metrics and network,
where fake nodes are incorrectly assigned metrics.
This error is resolved by buffering your input data.""".format(tolerance=self.TOL))
# Set the edge weight to the distance between those nodes
self._weight_edges()
logger.info('Directing Network Away From Roots')
# Transform edges to a rooted graph
self.direct_network()
# Assert that the netork is a tree
self.assert_is_tree()
# Build list of fake nodes
self.fake_nodes = self.fakes(self.metrics.index)
#Fillna values with Zero
self._metrics = self.metrics.fillna(0)
def __init__(self):
self.MapData = nx.read_shp('./map/111.shp')
import networkx as nx
import numpy as np
import pandas as pd
import json
import smopy
import matplotlib.pyplot as plt
import matplotlib as mpl
mpl.rcParams['figure.dpi'] = mpl.rcParams['savefig.dpi'] = 300
# g = nx.read_shp("eotroads_49/eotroads_49.shp")
g = nx.read_shp("data/tl_2013_06_prisecroads.shp")
print len(g.edges())
# print g.adjacency_list()
sgs = list(nx.connected_component_subgraphs(g.to_undirected()))
sg = sgs[0]
for element in sgs:
if element.order() > sg.order():
sg = element
print sg.order()
print len(sg.edges())
print sg.adjacency_list()
# pos2 = (36.6026, -121.9026)
# pos1 = (34.0569, -118.2427)
#Silicon Valley
# pos0 = (37.3627, -122.0323)
#LA
pos1 = (34.045536, -118.446065)
min_distance = None
for node in graph.nodes():
distance = calc_distance(node[1], node[0], latitude, longitude)
if closest_node == None:
closest_node = node
min_distance = distance
elif distance < min_distance:
closest_node = node
min_distance = distance
return closest_node
#############################################################################
print "Loading road network into memory..."
graph = networkx.read_shp("split_roads/split_roads.shp")
print "graph has %d nodes and %d edges" % (len(graph.nodes()),
len(graph.edges()))
graph = networkx.connected_component_subgraphs(graph.to_undirected()).next()
print "Calculating road lengths..."
num_roads = len(graph.edges())
num_done = 0
for node1,node2 in graph.edges():
if num_done % 1000 == 0:
print " %d%% done" % int(100 * float(num_done) / float(num_roads))
num_done = num_done + 1
wkt = graph[node1][node2]['Wkt']
def test_read_shp_nofile():
try:
from osgeo import ogr
except ImportError:
raise SkipTest('ogr not available.')
G = nx.read_shp("hopefully_this_file_will_not_be_available")
def find_connected_components(self):
"""finds "islands" in the network """
index = self.dlg.ui.layerCombo.currentIndex()
if index < 0:
# it may occur if there's no layer in the combo/legend
pass
else:
layer = self.dlg.ui.layerCombo.itemData(index)
# layer = QgsVectorLayer(self.fileName, "layer_name", "ogr")
index = self.dlg.ui.lts_combo.currentIndex()
if index < 0:
# it may occur if there's no layer in the combo/legend
pass
else:
lts_column = self.dlg.ui.lts_combo.itemData(index)
# with open("C:\Users\Peyman.n\Dropbox\Boulder\Plugin\LTS\log.txt","w")as file:
# file.write(lts_column +"\n")
lts1_existed = self.make_column(layer,"_isl_lts1")
lts2_existed = self.make_column(layer,"_isl_lts2")
lts3_existed = self.make_column(layer,"_isl_lts3")
lts4_existed = self.make_column(layer,"_isl_lts4")
# path = "C:/Users/Peyman.n/Dropbox/Boulder/BoulderStreetsRating_20140407_Peter/for_test.shp"
# out_path = "C:/Users/Peyman.n/Dropbox/Boulder/BoulderStreetsRating_20140407_Peter"
# get the path from selected layer
myfilepath= os.path.dirname( unicode( layer.dataProvider().dataSourceUri() ) ) ;
layer_name = layer.name()
path2 = myfilepath +"/"+layer_name+".shp"
out_path = myfilepath
# with open("C:\Users\Peyman.n\Dropbox\Boulder\Plugin\LTS\log.txt","a")as file:
# file.write(path2 +"\n")
# ##
# path3="C:/Users/Peyman.n/Dropbox/Boulder/BoulderStreetsRating_20140407_Peter/BoulderStreetsWProjection_20140407_Joined.shp"
layer2 = nx.read_shp(str(path2))
self.dlg.ui.progressBar.setValue(5)
G=layer2.to_undirected()
self.dlg.ui.progressBar.setValue(10)
lts_threshs = [(1,"_isl_lts1"),(2,"_isl_lts2"),(3,"_isl_lts3"),(4,"_isl_lts4")]
field = str(lts_column)
# with open("C:\Users\Peyman.n\Dropbox\Boulder\Plugin\LTS\log.txt","a")as file:
# file.write(field +"\n")
prog =0
for lts_thresh,attr in (lts_threshs):
prog +=1
temp = [(u,v,d) for u,v,d in G.edges_iter(data=True) if d[field] <= lts_thresh] # set the edges numbers to zero
g2 = nx.Graph(temp)
H=nx.connected_component_subgraphs(g2)
for idx, cc in enumerate(H):
for edge in cc.edges(data=True):
G[edge[0]][edge[1]][attr]=idx+1 # zero means it was filtered out
j= prog * 20
self.dlg.ui.progressBar.setValue(j)
# order attributes table
for index, edge in enumerate (G.edges(data=True)):
edge = list(edge)
edge[2] = OrderedDict(sorted(edge[2].items()))
edge=tuple(edge)
G[edge[0]][edge[1]] = edge[2]
self.remove_column(layer,"_isl_lts1",lts1_existed)
self.remove_column(layer,"_isl_lts2",lts2_existed)
self.remove_column(layer,"_isl_lts3",lts3_existed)
self.remove_column(layer,"_isl_lts4",lts4_existed)
out_name =str(layer_name+"_with islands")
write_shp(G,out_path,out_name)
self.dlg.ui.progressBar.setValue(100)
QMessageBox.information(self.dlg, ("Successful"), ("A new shapefile "+ out_name+" has been created in your folder"))
# Add to TOC
vlayer = QgsVectorLayer(out_path +"/"+out_name+".shp",out_name,"ogr")
#get crs of project
actual_crs = iface.mapCanvas().mapRenderer().destinationCrs()
#change crs of layer
vlayer.setCrs(actual_crs)
QgsMapLayerRegistry.instance().addMapLayer(vlayer)
self.dlg.close()
import arcpy
import networkx as nx
#Get shapefile directory
shp = str(arcpy.GetParameterAsText(0))
simplify = False
#Convert shapefile to networkx graph
arcpy.AddMessage("Converting to NetworkX Graph")
G = nx.read_shp(shp, simplify)
undinet = G.to_undirected()
#Clear edge dictionary
arcpy.AddMessage("Clearing attribute dictionary for ~performace~")
for u,v,a in undinet.edges(data=True):
a.clear()
#Draw the Graph
networkx.draw(G)
plt.savefig("path.png")
plt.show()
networkx.draw(G,pos=nx.spectral_layout(G), nodecolor='r',edge_color='b')
def main(path_nodes, path_edges, gid_nodes, gid_edges, weight_edges):
# ----------------------------------------------------------
# NetworkX
# ----------------------------------------------------------
# Import des données SHP à grapher:
G = nx.Graph(name="Floyd_Warshall_script", date=str(datetime.datetime.now()))
E = nx.read_shp(str(path_edges))
N = nx.read_shp(str(path_nodes))
G.add_nodes_from(N.nodes(data=True))
G.add_edges_from(E.edges(data=True))
# Changement de leur nom (pour l'instant, chaque valeur a le nom de ses coordonnées géographiques, c'est nul):
# ----------------------------------------------------------
# D'abord pour les edges:
x = 0
dict_edges = {}
total_edges = G.number_of_edges()
print("Processing Edges")
while x < total_edges:
try: # En raison de la structure possible des fichiers, on place un try qui propose [1] ou [2], histoire de parer à toute éventualité.
dict_edges[G.edges(data=True)[x][0]] = G.edges(data=True)[x][2][str(gid_edges)]
x = x + 1
except:
dict_edges[G.edges(data=True)[x][0]] = G.edges(data=True)[x][1][str(gid_edges)]
x = x + 1
# Maintenant pour les nodes:
x = 0
dict_nodes = {}
count_nodes = {}
total_nodes = G.number_of_nodes()
print("Processing Nodes")
while x < total_nodes:
try: # En raison de la structure possible des fichiers, on place un try qui propose [1] ou [2], histoire de parer à toute éventualité.
dict_nodes[G.nodes(data=True)[x][0]] = G.nodes(data=True)[x][1][str(gid_nodes)]
count_nodes[x] = G.nodes(data=True)[x][1][str(gid_nodes)]
x = x + 1
except:
dict_nodes[G.nodes(data=True)[x][0]] = G.nodes(data=True)[x][2][str(gid_nodes)]
count_nodes[x] = G.nodes(data=True)[x][1][str(gid_nodes)]
x = x + 1
# On renomme les nodes/edges par leur id/gid originels:
G = nx.relabel_nodes(G, dict_nodes)
print("Processing Graph")
# G=nx.relabel_edges(G,dict_edges) # Il semblerait que cette fonction n'existe pas... A rajouter manuellement, cela ne doit pas être bien dur.
# ----------------------------------------------------------
# On lance maintenant le calcul d'itinéraire pour l'ensemble des paires de noeuds du réseau:
starting_point = datetime.datetime.now()
results = nx.floyd_warshall(G, weight=str(weight_edges))
print(starting_point)
print(datetime.datetime.now())
print("Il aura fallu: " + str(datetime.datetime.now() - starting_point) + " pour effectuer le calcul")
text_file = open("Shitty_output.txt", "w")
text_file.write(str(results))
text_file.close()
open(
"Output.txt", "w"
).close() # On efface Output.txt avant de lancer des opérations "append" dessus, histoire d'eviter d'avoir un mélange de résultats de plusieurs fichiers.
with open("Output.txt", "a") as text_file:
gid = 0
i = 0
text_file.writelines("gid" + ";" + "Origin" + ";" + "Destination" + ";" + "FloydWarshall_Cost" + "\n")
while i < total_nodes:
origins = results[str(count_nodes[i])]
i1 = 0
for origin in origins:
while i1 < total_nodes:
gid = gid + 1
destinations = origins[str(count_nodes[i1])]
text_file.writelines(
str(gid)
+ ";"
+ str(count_nodes[i] + ";" + str(count_nodes[i1]) + ";" + str(destinations))
+ "\n"
)
i1 = i1 + 1
i = i + 1
text_file.close()
print(
'Un fichier .TXT nommé "Output" a maintenant du apparaitre dans le dossier depuis lequel nous avons chargé le shapefile'
)
def merge_lines(network_input):
#create a copy of the input network as a memory layer
crs=network_input.crs()
network_input_filepath=network_input.dataProvider().dataSourceUri()
network_input_dir=os.path.dirname(network_input_filepath)
network_input_basename=QFileInfo(network_input_filepath).baseName()
network_input_path= network_input_dir + "/"+ network_input_basename +".shp"
networ_expl_path= network_input_dir + "/"+ network_input_basename +"_exploded.shp"
network_input=QgsVectorLayer(network_input_path, "network_input", "ogr")
temp_network=QgsVectorLayer('LineString?crs='+crs.toWkt(), "temporary_network", "memory")
processing.runalg("qgis:explodelines",network_input,networ_expl_path)
expl_network=QgsVectorLayer(networ_expl_path,"network_exploded","ogr")
#add a column in the network_input file with feature ID
expl_network.startEditing()
expl_network.dataProvider().addAttributes([QgsField("feat_id_", QVariant.Int)])
expl_network.commitChanges()
fieldIdx = expl_network.dataProvider().fields().indexFromName("feat_id_")
updateMap = {}
for f in expl_network.getFeatures():
fid=f.id()
updateMap[fid] = { fieldIdx: fid}
expl_network.dataProvider().changeAttributeValues( updateMap )
QgsMapLayerRegistry.instance().addMapLayer(temp_network)
#iface.mapCanvas().refresh()
temp_network.dataProvider().addAttributes([y for y in expl_network.dataProvider().fields()])
temp_network.updateFields()
temp_network.startEditing()
temp_network.addFeatures([x for x in expl_network.getFeatures()])
temp_network.commitChanges()
temp_network.removeSelection()
"""01: Merge lines from intersection to intersection"""
#make a graph of the network_input_exploded layer
G_shp = nx.read_shp(str(networ_expl_path))
#parallel lines are excluded of the graph because it is not a multigraph, self loops are included
G=G_shp.to_undirected(reciprocal=False)
Dual_G=nx.MultiGraph()
for e in G.edges_iter(data='feat_id_'):
Dual_G.add_node(e[2])
for i,j in G.adjacency_iter():
if len(j)==2:
values=[]
for k,v in j.items():
values.append(v['feat_id_'])
#print values
Dual_G.add_edge(values[0],values[1],data=None)
#lines with three connections have been included, breaks at intresections
#set also include single edges
sets=[]
for j in connected_components(Dual_G):
sets.append(list(j))
#make a dictionary of all feature ids and corresponding geometry
D={}
for f in temp_network.getFeatures():
fid=f.attribute('feat_id_')
#careful! you need AndOwnership otherwise you get a C++ error
f_geom=f.geometryAndOwnership()
D[fid]=f_geom
#make a dictionary of sets of geometries to be combined and sets of ids to be combined
Geom_sets={}
for m in sets:
Geom_sets[tuple(m)]=[]
for k,v in Geom_sets.items():
geoms=[]
for i in k:
#print i
i_geom=D[i]
#print i_geom
geoms.append(i_geom)
Geom_sets[k]=tuple(geoms)
#make adjacency dictionary for nodes of Dual Graph (=edges)
AdjD={}
#returns an iterator of (node, adjacency dict) tuples for all nodes
for (i, v) in Dual_G.adjacency_iter():
AdjD[i]=v
sets_in_order=[]
for f in sets:
ord_set=[]
nodes_passed=[]
if len(f)==2 or len(f)==1:
ord_set=f
sets_in_order.append(ord_set)
else:
for n in f:
if len(AdjD[n])==1 or len(AdjD[n])>2:
first_line=n
else:
pass
ord_set=[]
nodes_passed.append(first_line)
ord_set.append(first_line)
for n in ord_set:
nodes=AdjD[n].keys()
for node in nodes:
if node in nodes_passed:
pass
else:
nodes_passed.append(node)
ord_set.append(node)
sets_in_order.append(ord_set)
#make a dictionary of all feature ids and corresponding geometry
A={}
for f in temp_network.getFeatures():
fid=f.attribute('feat_id_')
A[fid]=f.attributes()
#include in sets ord the geometry of the feature
for s in sets_in_order:
for indx,i in enumerate(s):
ind=indx
line=i
s[indx]= [line,D[line]]
#combine geometries
New_geoms=[]
for h in sets_in_order:
new_geom=None
if len(h)==1:
new_geom=h[0][1]
new_attr=A[h[0][0]]
elif len(h)==2 :
line1_geom=h[0][1]
line2_geom=h[1][1]
new_geom=line1_geom.combine(line2_geom)
new_attr=A[h[0][0]]
else:
new_attr=A[h[0][0]]
for i,line in enumerate(h):
ind=i
l=line
if ind==(len(h)-1):
pass
else:
l_geom=h[ind][1]
next_l=h[(ind+1)%len(h)]
next_l_geom=h[(ind+1)%len(h)][1]
new_geom=l_geom.combine(next_l_geom)
h[(ind+1)%len(h)][1]=new_geom
#print new_geom
New_geoms.append([new_geom,new_attr])
#delete all features and recreate memory layer with new geometries
temp_network.removeSelection()
temp_network.startEditing()
temp_network.selectAll()
temp_network.deleteSelectedFeatures()
temp_network.commitChanges()
New_feat=[]
#reconstruct new geometries
for i in New_geoms:
feature = QgsFeature()
feature.setGeometry(i[0])
feature.setAttributes(i[1])
New_feat.append(feature)
temp_network.startEditing()
temp_network.addFeatures(New_feat)
temp_network.commitChanges()
temp_network.removeSelection()
#break lines if they are Multilines
feat_to_del=[]
New_feat=[]
for f in temp_network.getFeatures():
f_geom_type = f.geometry().wkbType()
f_id = f.id()
attr=f.attributes()
if f_geom_type == 5:
new_geoms = f.geometry().asGeometryCollection()
for i in new_geoms:
new_feat = QgsFeature()
new_feat.setGeometry(i)
new_feat.setAttributes(attr)
New_feat.append(new_feat)
feat_to_del.append(f_id)
temp_network.startEditing()
temp_network.dataProvider().deleteFeatures(feat_to_del)
temp_network.addFeatures(New_feat)
temp_network.commitChanges()
temp_network.removeSelection()
return temp_network
def read_shp(path):
""" Active development for shp read is now done in networkx. This function left in for compatibilty purposes.
"""
return nx.read_shp(path)
def test_missing_geometry(self):
G = nx.read_shp(self.path)
def read_shp_to_graph(shp_path):
graph_shp = nx.read_shp(str(shp_path), simplify=True)
graph = nx.MultiGraph(graph_shp.to_undirected(reciprocal=False))
return graph
# -*- coding: utf-8 -*-
import networkx as nx
import numpy as np
import json
from shapely.geometry import asLineString, asMultiPoint
def write_geojson(outfilename, indata):
with open(outfilename, "w") as file_out:
file_out.write(json.dumps(indata))
# use Networkx to load a Noded shapefile
# returns a graph where each node is a coordinate pair
# and the edge is the line connecting the two nodes
nx_load_shp = nx.read_shp("../geodata/shp/e01_network_lines_3857.shp")
# A graph is not always connected, so we take the largest connected subgraph
# by using the connected_component_subgraphs function.
nx_list_subgraph = list(nx.connected_component_subgraphs(nx_load_shp.to_undirected()))[0]
# get all the nodes in the network
nx_nodes = np.array(nx_list_subgraph.nodes())
# output the nodes to a GeoJSON file to view in QGIS
network_nodes = asMultiPoint(nx_nodes)
write_geojson("../geodata/ch08_final_netx_nodes.geojson", network_nodes.__geo_interface__ )
# this number represents the nodes position
import sys
import networkx as nx
import matplotlib.pyplot as plt
import math
import random
from heapq import heappop, heappush
G = nx.DiGraph.to_undirected(nx.read_shp('./aa_scratch0/axons_larissa_with_buildings6_sub0.shp'))
for x in G:
print (x)
print sys.argv[1] # first parameter
