def check_points_cover_start_end(points, lines):
'''
:param points: Shapely point geometries
:param lines:Shapely linestrings
:return:
'''
all_start_end_nodes = create_start_end_pts(lines)
bad_points = []
good_points = []
if len(points) > 1:
for pt in points:
if pt.touches(all_start_end_nodes):
print "touches"
if pt.disjoint(all_start_end_nodes):
print "disjoint" # 2 nodes
bad_points.append(pt)
if pt.equals(all_start_end_nodes):
print "equals"
if pt.within(all_start_end_nodes):
print "within" # all our nodes on start or end
if pt.intersects(all_start_end_nodes):
print "intersects"
good_points.append(pt)
else:
if points.intersects(all_start_end_nodes):
print "intersects"
good_points.append(points)
if points.disjoint(all_start_end_nodes):
print "disjoint"
good_points.append(points)
if len(bad_points) > 1:
print "oh no 1 or more points are NOT on a start or end node"
out_geoj(bad_points, '../geodata/points_bad.geojson')
out_geoj(good_points, '../geodata/points_good.geojson')
elif len(bad_points) == 1:
print "oh no your input single point is NOT on start or end node"
else:
print "super all points are located on a start or end node" \
"NOTE point duplicates are NOT checked"
def check_points_cover_start_end(points, lines):
'''
:param points: Shapely point geometries
:param lines:Shapely linestrings
:return:
'''
all_start_end_nodes = create_start_end_pts(lines)
bad_points = []
good_points = []
if len(points) > 1:
for pt in points:
if pt.touches(all_start_end_nodes):
print "touches"
if pt.disjoint(all_start_end_nodes):
print "disjoint" # 2 nodes
bad_points.append(pt)
if pt.equals(all_start_end_nodes):
print "equals"
if pt.within(all_start_end_nodes):
print "within" # all our nodes on start or end
if pt.intersects(all_start_end_nodes):
print "intersects"
good_points.append(pt)
else:
if points.intersects(all_start_end_nodes):
print "intersects"
good_points.append(points)
if points.disjoint(all_start_end_nodes):
print "disjoint"
good_points.append(points)
if len(bad_points) > 1:
print "oh no 1 or more points are NOT on a start or end node"
out_geoj(bad_points, '../geodata/points_bad.geojson')
out_geoj(good_points, '../geodata/points_good.geojson')
elif len(bad_points) == 1:
print "oh no your input single point is NOT on start or end node"
else:
print "super all points are located on a start or end node" \
"NOTE point duplicates are NOT checked"
# add valid geometry to list
plys.append(g)
# convert new polygons into a new MultiPolygon
out_new_valid_multi = MultiPolygon(plys)
return out_new_valid_multi
if __name__ == "__main__":
# input NOAA Shapefile
shp = realpath("../geodata/temp-all-warn-week.shp")
# output union_dissolve results as GeoJSON
out_geojson_file = realpath("../geodata/ch06-03_union_dissolve.geojson")
out_wkt_js = realpath("ol3/data/ch06-03_results_union.js")
# input Shapefile and convert to Shapely geometries
shply_geom = create_shapes(shp)
# Check the Shapely geometries if they are valid if not fix them
new_valid_geom = check_geom(shply_geom)
# run our union with dissolve
dissolve_result = cascaded_union(new_valid_geom)
# output the resulting union dissolved polygons to GeoJSON file
out_geoj(dissolve_result, out_geojson_file)
write_wkt(out_wkt_js, dissolve_result)
overlap_found = False
for line in shp1_lines:
if line.equals(shp2_lines_overlap):
print "equals"
overlap_found = True
if line.within(shp2_lines_overlap):
print "within"
overlap_found = True
# output the overlapping linestrings
if overlap_found:
print "now exporting overlaps to GeoJSON"
out_int = shp1_lines.intersection(shp2_lines_overlap)
out_geoj(out_int, '../geodata/overlapping_lines.geojson')
# create final linestring only list of overlapping lines
# uses a pyhton list comprehension expression
# only export the linestrings Shapely also creates 2 Points
# where the linestrings cross and touch
final = [feature for feature in out_int if feature.geom_type == "LineString"]
# code if you do not want to use a list comprehension expresion
# final = []
# for f in out_int:
# if f.geom_type == "LineString":
# final.append(f)
# export final list of geometries to GeoJSON
out_geoj(final, '../geodata/final_overlaps.geojson')
overlap_found = False
for line in shp1_lines:
if line.equals(shp2_lines_overlap):
print "equals"
overlap_found = True
if line.within(shp2_lines_overlap):
print "within"
overlap_found = True
# output the overlapping linestrings
if overlap_found:
print "now exporting overlaps to GeoJSON"
out_int = shp1_lines.intersection(shp2_lines_overlap)
out_geoj(out_int, '../geodata/overlapping_lines.geojson')
# create final linestring only list of overlapping lines
# uses a pyhton list comprehension expression
# only export the linestrings Shapely also creates 2 Points
# where the linestrings cross and touch
final = [
feature for feature in out_int if feature.geom_type == "LineString"
]
# code if you do not want to use a list comprehension expresion
# final = []
# for f in out_int:
# if f.geom_type == "LineString":
# final.append(f)
shp2_polys = create_polys(shp2_data)
# run the difference and intersection
res_difference = shp1_polys.difference(shp2_polys)
res_intersection = shp1_polys.intersection(shp2_polys)
def create_out(res1, res2):
"""
:param res1: input feature
:param res2: identity feature
:return: MultiPolygon identity results
"""
identity_geoms = []
for g1 in res1:
identity_geoms.append(g1)
for g2 in res2:
identity_geoms.append(g2)
out_identity = MultiPolygon(identity_geoms)
return out_identity
# combine the difference and intersection polygons into results
result_identity = create_out(res_difference, res_intersection)
# export identity results to a GeoJSON
out_geoj(result_identity, out_geojson_file)
# go through each line added first to second
# then second to third and so on
shply_lines = lines[:i] + lines[i + 1:]
# 0 is start point and -1 is end point
# run through
for start_end in [0, -1]:
# convert line to point
node = Point(line.coords[start_end])
# Return True if any element of the iterable is true.
# https://docs.python.org/2/library/functions.html#any
# python boolean evaluation comparison
if any(node.touches(next_line) for next_line in shply_lines):
continue
else:
list_dangles.append(node)
return list_dangles
# convert our Shapely MultiLineString to list
list_lines = [line for line in shp1_lines]
# find those dangles
result_dangles = find_dangles(list_lines)
# return our results
if len(result_dangles) >= 1:
print "yes we found some dangles exporting to GeoJSON"
out_geoj(result_dangles, '../geodata/dangles.geojson')
else:
print "no dangles found"
shp2_polys = create_polys(shp2_data)
# run the difference and intersection
res_difference = shp1_polys.difference(shp2_polys)
res_intersection = shp1_polys.intersection(shp2_polys)
def create_out(res1, res2):
"""
:param res1: input feature
:param res2: identity feature
:return: MultiPolygon identity results
"""
identity_geoms = []
for g1 in res1:
identity_geoms.append(g1)
for g2 in res2:
identity_geoms.append(g2)
out_identity = MultiPolygon(identity_geoms)
return out_identity
# combine the difference and intersection polygons into results
result_identity = create_out(res_difference, res_intersection)
# export identity results to a GeoJSON
out_geoj(result_identity, out_geojson_file)
# each line gets a number
# go through each line added first to second
# then second to third and so on
shply_lines = lines[:i] + lines[i+1:]
# 0 is start point and -1 is end point
# run through
for start_end in [0, -1]:
# convert line to point
node = Point(line.coords[start_end])
# Return True if any element of the iterable is true.
# https://docs.python.org/2/library/functions.html#any
# python boolean evaluation comparison
if any(node.touches(next_line) for next_line in shply_lines):
continue
else:
list_dangles.append(node)
return list_dangles
# convert our Shapely MultiLineString to list
list_lines = [line for line in shp1_lines]
# find those dangles
result_dangles = find_dangles(list_lines)
# return our results
if len(result_dangles) >= 1:
print "yes we found some dangles exporting to GeoJSON"
out_geoj(result_dangles, '../geodata/dangles.geojson')
else:
print "no dangles found"
# create our centroids for each polygon
list_centroids = [x.centroid for x in polygons]
# list to store all of our centroids within tolerance
good_points = []
for centroid in list_centroids:
for line in lines:
# calculate point location on line nearest to centroid
pt_interpolate = line.interpolate(line.project(centroid))
# determine distance between 2 cartesian points
# that are less than the tolerance value in meters
if centroid.distance(pt_interpolate) > tolerance:
print "to far " + str(centroid.distance(pt_interpolate))
else:
print "hey your in " + str(centroid.distance(pt_interpolate))
good_points.append(centroid)
if len(good_points) > 1:
return good_points
else:
print "sorry no centroids found within your tolerance of " + str(tolerance)
# run our function to get a list of centroids within tolerance
result_points = within_tolerance(shply_polys, shp1_lines, 20000)
if result_points:
out_geoj(result_points, '../geodata/centroids_within_tolerance.geojson')
else:
print "sorry cannot export GeoJSON of Nothing"
# list to store all of our centroids within tolerance
good_points = []
for centroid in list_centroids:
for line in lines:
# calculate point location on line nearest to centroid
pt_interpolate = line.interpolate(line.project(centroid))
# determine distance between 2 cartesian points
# that are less than the tolerance value in meters
if centroid.distance(pt_interpolate) > tolerance:
print "to far " + str(centroid.distance(pt_interpolate))
else:
print "hey your in " + str(centroid.distance(pt_interpolate))
good_points.append(centroid)
if len(good_points) > 1:
return good_points
else:
print "sorry no centroids found within your tolerance of " + str(
tolerance)
# run our function to get a list of centroids within tolerance
result_points = within_tolerance(shply_polys, shp1_lines, 20000)
if result_points:
out_geoj(result_points, '../geodata/centroids_within_tolerance.geojson')
else:
print "sorry cannot export GeoJSON of Nothing"