def feat_to_pnt(inShp, outPnt, epsg=None):
"""
Get Centroid from each line in a PolyLine Feature Class
"""
import os
from osgeo import ogr
from gasp.prop.ff import drv_name
from gasp.mng.fld import ogr_copy_fields
from gasp.mng.fld import lst_fld
# TODO: check if geometry is correct
# Open data
polyData = ogr.GetDriverByName(drv_name(outPnt)).Open(inShp)
polyLyr = polyData.GetLayer()
# Get SRS for the output
if not epsg:
from gasp.prop.prj import get_shp_sref
srs = get_shp_sref(polyLyr)
else:
from gasp.prop.prj import get_sref_from_epsg
srs = get_sref_from_epsg(epsg)
# Create output
pntData = ogr.GetDriverByName(drv_name(outPnt)).CreateDataSource(outPnt)
pntLyr = pntData.CreateLayer(os.path.splitext(os.path.basename(outPnt))[0],
srs,
geom_type=ogr.wkbPoint)
# Copy fields from input to output
fields = lst_fld(polyLyr)
ogr_copy_fields(polyLyr, pntLyr)
pntLyrDefn = pntLyr.GetLayerDefn()
for feat in polyLyr:
geom = feat.GetGeometryRef()
pnt = geom.Centroid()
new_feat = ogr.Feature(pntLyrDefn)
new_feat.SetGeometry(pnt)
for fld in fields:
new_feat.SetField(fld, feat.GetField(fld))
pntLyr.CreateFeature(new_feat)
new_feat.Destroy()
del pntLyr
del polyLyr
pntData.Destroy()
polyData.Destroy()
return outPnt
def ogr_select_by_location(shp, boundary_filter, filtered_output):
"""
Filter a shp using the location of a boundary_filter shp
For now the boundary must have only one feature
Writes the filter on a new shp
"""
import os
from osgeo import ogr
from gasp.prop.ff import drv_name
from gasp.prop.feat import get_geom_type
from gasp.mng.gen import copy_feat
from gasp.mng.fld import ogr_copy_fields
# Open main data
dtSrc = ogr.GetDriverByName(drv_name(shp)).Open(shp, 0)
lyr = dtSrc.GetLayer()
# Get filter geom
filter_shp = ogr.GetDriverByName(drv_name(boundary_filter)).Open(
boundary_filter, 0)
filter_lyr = filter_shp.GetLayer()
c = 0
for f in filter_lyr:
if c:
break
geom = f.GetGeometryRef()
c += 1
filter_shp.Destroy()
# Apply filter
lyr.SetSpatialFilter(geom)
# Copy filter objects to a new shape
out = ogr.GetDriverByName(
drv_name(filtered_output)).CreateDataSource(filtered_output)
outLyr = out.CreateLayer(os.path.splitext(
os.path.basename(filtered_output))[0],
geom_type=get_geom_type(shp,
gisApi='ogr',
name=None,
py_cls=True))
# Copy fields
ogr_copy_fields(lyr, outLyr)
copy_feat(lyr,
outLyr,
outDefn=outLyr.GetLayerDefn(),
only_geom=False,
gisApi='ogrlyr')
def get_shp_sref(shp):
"""
Get Spatial Reference Object from Feature Class/Lyr
"""
from osgeo import ogr
from gasp.prop.ff import drv_name
if type(shp) == ogr.Layer:
lyr = shp
c = 0
else:
data = ogr.GetDriverByName(drv_name(shp)).Open(shp)
lyr = data.GetLayer()
c = 1
spref = lyr.GetSpatialRef()
if c:
del lyr
data.Destroy()
return spref
def dist_to_nodes(pnt_shp, cstSurface, string, w):
nodes = ogr.GetDriverByName(drv_name(pnt_shp)).Open(pnt_shp, 0)
nodesLyr = nodes.GetLayer()
c = 0
dicNodes = {}
for pnt in nodesLyr:
geom = pnt.GetGeometryRef()
point = geom.ExportToWkb()
OGR_CreateNewShape(
OGR_GetDriverName(pnt_shp),
os.path.join(w, '{pnt}_{o}.shp'.format(pnt=string, o=str(c))),
ogr.wkbPoint, [point])
FT_TF_GRASS(
os.path.join(w, '{pnt}_{o}.shp'.format(pnt=string, o=str(c))),
'{pnt}_{o}'.format(pnt=string, o=str(c)), 'None')
GRASS_CostDistance(cstSurface, '{pnt}_{o}'.format(pnt=string,
o=str(c)),
'cst_{pnt}_{a}'.format(pnt=string, a=str(c)))
dicNodes['{pnt}_{o}'.format(pnt=string, o=str(c))] = [
os.path.join(w, '{pnt}_{o}.shp'.format(pnt=string, o=str(c))),
'cst_{pnt}_{a}'.format(pnt=string, a=str(c))
]
c += 1
return dicNodes
def add_fields(table, fields):
"""
Receive a feature class and a dict with the field name and type
and add the fields in the feature class
TODO: Check if fields is a dict
"""
import os
if type(table) == ogr.Layer:
lyr = table
c = 0
else:
if os.path.exists(table) and os.path.isfile(table):
# Open table in edition mode
__table = ogr.GetDriverByName(drv_name(table)).Open(table, 1)
# Get Layer
lyr = __table.GetLayer()
c = 1
else:
raise ValueError('File path does not exist')
for fld in fields:
lyr.CreateField(ogr.FieldDefn(fld, fields[fld]))
if c:
del lyr
__table.Destroy()
else:
return lyr
def get_centroid_boundary(shp, isFile=None):
"""
Return centroid (OGR Point object) of a Boundary (layer with a single
feature).
"""
from osgeo import ogr
from gasp.prop.ff import drv_name
if isFile:
shp = ogr.GetDriverByName(
drv_name(shp)).Open(shp, 0)
lyr = shp.GetLayer()
feat = lyr[0]; geom = feat.GetGeometryRef()
else:
geom = shp
centroid = geom.Centroid()
cnt = ogr.CreateGeometryFromWkt(centroid.ExportToWkt())
shp.Destroy()
return cnt
def lst_fld(shp):
"""
Return a list with every field name in a vectorial layer
"""
if type(shp) == ogr.Layer:
lyr = shp
c = 0
else:
data = ogr.GetDriverByName(drv_name(shp)).Open(shp, 0)
lyr = data.GetLayer()
c = 1
defn = lyr.GetLayerDefn()
fields = []
for i in range(0, defn.GetFieldCount()):
fdefn = defn.GetFieldDefn(i)
fields.append(fdefn.name)
if c:
del lyr
data.Destroy()
return fields
def rst_val_to_points(pnt, rst):
"""
Extract, for a given point dataset, the value of a cell with the same location
Returns a dict:
d = {
fid: value,
...
}
"""
from osgeo import ogr
from gasp.prop.ff import drv_name
values_by_point = {}
shp = ogr.GetDriverByName(drv_name(pnt)).Open(pnt, 0)
lyr = shp.GetLayer()
img = gdal.Open(rst)
geo_transform = img.GetGeoTransform()
band = img.GetRasterBand(1)
for feat in lyr:
geom = feat.GetGeometryRef()
mx, my = geom.GetX(), geom.GetY()
px = int((mx - geo_transform[0]) / geo_transform[1])
py = int((my - geo_transform[3]) / geo_transform[5])
val_pix = band.ReadAsArray(px, py, 1, 1)
values_by_point[int(feat.GetFID())] = float(val_pix[0][0])
return values_by_point
def get_geom_by_index(inShp, idx):
"""
Get Geometry by index in file
"""
from osgeo import ogr
from gasp.prop.ff import drv_name
src = ogr.GetDriverByName(drv_name(inShp)).Open(inShp)
lyr = src.GetLayer()
c = 0
geom = None
for f in lyr:
if idx == c:
geom = f.GetGeometryRef()
else:
c += 1
if not geom:
raise ValueError("inShp has not idx")
_geom = geom.ExportToWkt()
del lyr
src.Destroy()
return _geom
def ogr_list_fields_defn(shp):
"""
Return a dict with the field name as key and the field definition as value
Field defn is the same of saying name + type
"""
if type(shp) == ogr.Layer:
lyr = shp
c = 0
else:
data = ogr.GetDriverByName(drv_name(shp)).Open(shp, 0)
lyr = data.GetLayer()
c = 1
defn = lyr.GetLayerDefn()
fields = {}
for i in range(0, defn.GetFieldCount()):
fdefn = defn.GetFieldDefn(i)
fieldType = fdefn.GetFieldTypeName(fdefn.GetType())
fields[fdefn.name] = {fdefn.GetType(): fieldType}
if c:
del lyr
data.Destroy()
return fields
def area_to_dic(shp):
"""
Return the following output:
dic = {
id_feat: area,
...,
id_feat: area
}
"""
from osgeo import ogr
from gasp.prop.ff import drv_name
o = ogr.GetDriverByName(drv_name(shp)).Open(shp, 0)
l = o.GetLayer()
d = {}
c = 0
for feat in l:
g = feat.GetGeometryRef()
area = g.GetArea()
d[c] = area
c += 1
del l
o.Destroy()
return d
def sel_by_attr(inShp, sql, outShp, geomType="area", lyrN=1, api_gis='ogr'):
"""
Select vectorial file and export to new file
If api_gis == 'grass' or 'pygrass', sql is not a query but the where clause
API's Available:
* ogr;
* grass;
* pygrass
"""
if api_gis == 'ogr':
from gasp import exec_cmd
from gasp.prop.ff import drv_name
out_driver = drv_name(outShp)
cmd = 'ogr2ogr -f "{drv}" {o} {i} -dialect sqlite -sql "{s}"'.format(
o=outShp, i=inShp, s=sql, drv=out_driver)
# Execute command
outcmd = exec_cmd(cmd)
elif api_gis == 'pygrass':
"""
v.extract via pygrass
"""
from grass.pygrass.modules import Module
m = Module("v.extract",
input=inShp,
type=geomType,
layer=lyrN,
where=sql,
output=outShp,
overwrite=True,
run_=False,
quiet=True)
m()
elif api_gis == 'grass':
"""
v.extract via command shell
"""
from gasp import exec_cmd
rcmd = exec_cmd(
("v.extract input={} type={} layer={} where={} "
"output={} --overwrite --quiet").format(inShp, geomType,
str(lyrN), sql, outShp))
else:
raise ValueError('API {} is not available'.format(api_gis))
return outShp
def shpext_to_boundary(inShp, outShp, epsg=None):
"""
Read one feature class extent and create a boundary with that
extent
The outFile could be a Feature Class or one Raster Dataset
"""
import os
from gasp.oss import get_filename
from gasp.to.geom import create_point
from gasp.prop.ext import get_extent
extent = get_extent(inShp, gisApi='ogr')
# Create points of the new boundary based on the extent
boundary_points = [
create_point(extent[0], extent[3], api='ogr'),
create_point(extent[1], extent[3], api='ogr'),
create_point(extent[1], extent[2], api='ogr'),
create_point(extent[0], extent[2], api='ogr'),
create_point(extent[0], extent[3], api='ogr')
]
# Get SRS for the output
if not epsg:
from gasp.prop.prj import get_shp_sref
srs = get_shp_sref(inShp)
else:
from gasp.prop.prj import get_sref_from_epsg
srs = get_sref_from_epsg(epsg)
# Write new file
shp = ogr.GetDriverByName(drv_name(outShp)).CreateDataSource(outShp)
lyr = shp.CreateLayer(get_filename(outShp, forceLower=True),
srs,
geom_type=ogr.wkbPolygon)
outDefn = lyr.GetLayerDefn()
feat = ogr.Feature(outDefn)
ring = ogr.Geometry(ogr.wkbLinearRing)
for pnt in boundary_points:
ring.AddPoint(pnt.GetX(), pnt.GetY())
polygon = ogr.Geometry(ogr.wkbPolygon)
polygon.AddGeometry(ring)
feat.SetGeometry(polygon)
lyr.CreateFeature(feat)
feat.Destroy()
shp.Destroy()
return outShp
def array_to_raster(inArray,
outRst,
template,
epsg,
data_type,
noData=None,
gisApi='gdal'):
"""
Send Array to Raster
API Available:
* gdal;
* arcpy
"""
if gisApi == 'gdal':
from osgeo import gdal, osr
from gasp.prop.ff import drv_name
img_template = gdal.Open(template)
geo_transform = img_template.GetGeoTransform()
rows, cols = inArray.shape
driver = gdal.GetDriverByName(drv_name(outRst))
out = driver.Create(outRst, cols, rows, 1, data_type)
out.SetGeoTransform(geo_transform)
outBand = out.GetRasterBand(1)
if noData:
outBand.SetNoDataValue(noData)
outBand.WriteArray(inArray)
if epsg:
from gasp.prop.prj import epsg_to_wkt
srs = epsg_to_wkt(epsg)
out.SetProjection(srs)
outBand.FlushCache()
elif gisApi == 'arcpy':
import arcpy
xmin = arcpy.GetRasterProperties_management(template, "LEFT")
cellx = arcpy.GetRasterProperties_management(template, "CELLSIZEX")
celly = arcpy.GetRasterProperties_management(template, "CELLSIZEY")
new_rst = arcpy.NumPyArrayToRaster(array,
float(str(xmin).replace(',', '.')),
float(str(cellx).replace(",", ".")),
float(str(celly).replace(",", ".")))
new_rst.save(outRst)
else:
raise ValueError('The api {} is not available'.format(gisApi))
return outRst
def get_attr_values_by_location(inShp, attr, geomFilter=None, shpFilter=None):
"""
Get attributes of the features of inShp that intersects with geomFilter
or shpFilter
"""
from osgeo import ogr
from gasp.prop.ff import drv_name
if not geomFilter and not shpFilter:
raise ValueError(
'A geom object or a path to a sho file should be given')
if shpFilter:
# For now the shpFilter must have only one feature
filter_shp = ogr.GetDriverByName(drv_name(shpFilter)).Open(
shpFilter, 0)
filter_lyr = filter_shp.GetLayer()
c = 0
for f in filter_lyr:
if c:
break
geom = f.GetGeometryRef()
c += 1
filter_shp.Destroy()
else:
geom = geomFilter
# Open Main data
dtSrc = ogr.GetDriverByName(drv_name(inShp)).Open(inShp, 0)
lyr = dtSrc.GetLayer()
lyr.SetSpatialFilter(geom)
# Get attribute values
ATTRIBUTE_VAL = [feat.GetField(attr) for feat in lyr]
dtSrc.Destroy()
return ATTRIBUTE_VAL
def statistics_by_line_feat(lines, raster, statistic, new_field):
"""
Estimates raster statistic per line on a linear feature class
statistic = statistic type (e.g. max, min, mean, sum)
This method has an important problem - depends on the
number of vertex of each features
"""
from osgeo import ogr, gdal
from gasp.prop.ff import drv_name
from gasp.cpu.gdl.sampling import gdal_point_value_on_raster
# Open feature class
shp = ogr.GetDriverByName(drv_name(lines)).Open(lines, 1)
lyr = shp.GetLayer()
# Create new field
lyr.CreateField(ogr.FieldDefn(new_field, ogr.OFTReal))
# Open Raster
img = gdal.Open(raster)
geo_transform = img.GetGeoTransform()
band = img.GetRasterBand(1)
# For feature in layer
for feat in lyr:
rst_values = []
# For point in line
lnh = feat.GetGeometryRef()
num_pnt = lnh.GetPointCount()
for pnt in range(num_pnt):
x, y, z = lnh.GetPoint(pnt)
cell = gdal_point_value_on_raster(x, y, band, geo_transform)
if not cell:
continue
else:
rst_values.append(cell)
if len(rst_values):
if statistic == 'minimum':
value = min(rst_values)
elif statistic == 'maximum':
value = max(rst_values)
elif statistic == 'mean':
value = sum(rst_values) / len(rst_values)
elif statistic == 'sum':
value = sum(rst_values)
else:
continue
feat.SetField(new_field, value)
lyr.SetFeature(feat)
def shply_array_to_shp(arrayLike,
outfile,
geomType,
epsg=None,
fields=None,
crsObj=None):
"""
Convert a array with Shapely geometric data into a file
with geometry (GML, ESRI Shapefile or others).
Example of an array_like object:
data = [
{col_1: value, col_2: value, geom: geomObj},
{col_1: value, col_2: value, geom: geomObj},
]
"""
import os
from gasp.prop.ff import drv_name
from gasp.prop.prj import get_sref_from_epsg
# Create output file
shp = ogr.GetDriverByName(drv_name(outfile)).CreateDataSource(outfile)
lyr = shp.CreateLayer(
os.path.splitext(os.path.basename(outfile))[0],
get_sref_from_epsg(epsg) if epsg else crsObj if crsObj else \
None, geom_type=geomType
)
# Create fields of output file
# TODO: Automatic mapping of filters types needs further testing
if fields:
for f in fields:
lyr.CreateField(ogr.FieldDefn(f, fields[f]))
# Add features
defn = lyr.GetLayerDefn()
for feat in arrayLike:
newFeat = ogr.Feature(defn)
newFeat.SetGeometry(ogr.CreateGeometryFromWkb(feat['GEOM'].wkb))
if len(fields):
for f in fields:
newFeat.SetField(f, feat[f])
lyr.CreateFeature(newFeat)
newFeat = None
shp.Destroy()
return outfile
def composite_bnds(rsts, outRst, epsg=None, gisAPI='gdal'):
"""
Composite Bands
API's Available:
* gdal;
"""
if gisAPI == 'gdal':
"""
Using GDAL
"""
from osgeo import gdal
from gasp.fm.rst import rst_to_array
from gasp.prop.ff import drv_name
from gasp.prop.rst import rst_dataType, get_nodata
# Get Arrays
_as = [rst_to_array(r) for r in rsts]
# Get nodata values
nds = [get_nodata(r, gisApi='gdal') for r in rsts]
# Open template and get some metadata
img_temp = gdal.Open(rsts[0])
geo_tran = img_temp.GetGeoTransform()
band = img_temp.GetRasterBand(1)
dataType = rst_dataType(band)
rows, cols = _as[0].shape
# Create Output
drv = gdal.GetDriverByName(drv_name(outRst))
out = drv.Create(outRst, cols, rows, len(_as), dataType)
out.SetGeoTransform(geo_tran)
if epsg:
from gasp.prop.prj import epsg_to_wkt
srs = epsg_to_wkt(epsg)
out.SetProjection(srs)
# Write all bands
for i in range(len(_as)):
outBand = out.GetRasterBand(i + 1)
outBand.SetNoDataValue(nds[i])
outBand.WriteArray(_as[i])
outBand.FlushCache()
else:
raise ValueError('The api {} is not available'.format(gisAPI))
return outRst
def shp_to_shp(inShp, outShp, gisApi='ogr', supportForSpatialLite=None):
"""
Convert a vectorial file to another with other file format
API's Available:
* ogr;
* arcpy;
When using gisApi='ogr' - Set supportForSpatialLite to True if outShp is
a sqlite db and if you want SpatialLite support for that database.
"""
import os
if gisApi == 'ogr':
from gasp import exec_cmd
from gasp.prop.ff import drv_name
out_driver = drv_name(outShp)
if out_driver == 'SQLite' and supportForSpatialLite:
splite = ' -dsco "SPATIALITE=YES"'
else:
splite = ''
cmd = 'ogr2ogr -f "{drv}" {out} {_in}{lite}'.format(drv=out_driver,
out=outShp,
_in=inShp,
lite=splite)
# Run command
cmdout = exec_cmd(cmd)
elif gisApi == 'arcpy':
"""
Feature Class to Feature Class using ArcGIS
"""
import arcpy
arcpy.FeatureClassToFeatureClass_conversion(inShp,
os.path.dirname(outShp),
os.path.basename(outShp),
"", "", "")
else:
raise ValueError('Sorry, API {} is not available'.format(gisApi))
return outShp
def merge_feat(shps, outShp, api="ogr2ogr"):
"""
Get all features in several Shapefiles and save them in one file
"""
if api == "ogr2ogr":
from gasp import exec_cmd
from gasp.prop.ff import drv_name
out_drv = drv_name(outShp)
# Create output and copy some features of one layer (first in shps)
cmdout = exec_cmd('ogr2ogr -f "{}" {} {}'.format(
out_drv, outShp, shps[0]
))
# Append remaining layers
lcmd = [exec_cmd(
'ogr2ogr -f "{}" -update -append {} {}'.format(
out_drv, outShp, shps[i]
)
) for i in range(1, len(shps))]
elif api == 'pandas':
"""
Merge SHP using pandas
"""
from gasp.fm import tbl_to_obj
from gasp.to.shp import df_to_shp
if type(shps) != list:
raise ValueError('shps should be a list with paths for Feature Classes')
dfs = [tbl_to_obj(shp) for shp in shps]
result = dfs[0]
for df in dfs[1:]:
result = result.append(df, ignore_index=True, sort=True)
df_to_shp(result, outShp)
else:
raise ValueError(
"{} API is not available"
)
return outShp
def osmosis_extract(boundary, osmdata, wepsg, output):
"""
Extract OSM Data from a xml file with osmosis
The extraction is done using the extent of a boundary
"""
import os
from osgeo import ogr
from gasp import exec_cmd
from gasp.prop.ff import drv_name
from gasp.mng.prj import project_geom
# Assuming that boundary has only one feature
# Get Geometry
dtSrc = ogr.GetDriverByName(drv_name(boundary)).Open(boundary)
lyr = dtSrc.GetLayer()
for feat in lyr:
geom = feat.GetGeometryRef()
break
# Convert boundary to WGS84 -EPSG 4326
geom_wgs = project_geom(geom, int(wepsg), 4326,
api='ogr') if int(wepsg) != 4326 else geom
# Get boundary extent
left, right, bottom, top = geom_wgs.GetEnvelope()
# Osmosis shell comand
osmExt = os.path.splitext(osmdata)[1]
osm_f = 'enableDateParsing=no' if osmExt == '.xml' or osmExt == '.osm' else ''
cmd = ('osmosis --read-{_f} {p} file={_in} --bounding-box top={t} left={l}'
' bottom={b} right={r} --write-{outext} file={_out}').format(
_f='xml' if osmExt == '.xml' or osmExt == '.osm' else 'pbf',
p=osm_f,
_in=osmdata,
t=str(top),
l=str(left),
b=str(bottom),
r=str(right),
_out=output,
outext=os.path.splitext(output)[1][1:])
# Execute command
outcmd = exec_cmd(cmd)
return output
def rst_to_rst(inRst, outRst):
"""
Convert a raster file to another raster format
"""
from gasp import exec_cmd
from gasp.prop.ff import drv_name
outDrv = drv_name(outRst)
cmd = 'gdal_translate -of {drv} {_in} {_out}'.format(
drv=outDrv, _in=inRst, _out=outRst
)
cmdout = exec_cmd(cmd)
return outRst
def dic_buffer_array_to_shp(arrayBf, outShp, epsg, fields=None):
"""
Array with dict with buffer proprieties to Feature Class
"""
import os
from osgeo import ogr
from gasp.prop.ff import drv_name
from gasp.prop.prj import get_sref_from_epsg
# Get SRS for output
srs = get_sref_from_epsg(epsg)
# Create output DataSource and Layer
outData = ogr.GetDriverByName(drv_name(outShp)).CreateDataSource(outShp)
lyr = outData.CreateLayer(os.path.splitext(os.path.basename(outShp))[0],
srs,
geom_type=ogr.wkbPolygon)
# Create fields
if fields:
from gasp.mng.fld import add_fields
add_fields(lyr, fields)
lyrDefn = lyr.GetLayerDefn()
for _buffer in arrayBf:
newFeat = ogr.Feature(lyrDefn)
geom = coord_to_buffer(_buffer["X"], _buffer["Y"], _buffer["RADIUS"])
newFeat.SetGeometry(geom)
for field in fields:
if field in _buffer.keys():
newFeat.SetField(field, _buffer[field])
lyr.CreateFeature(newFeat)
newFeat.Destroy()
del lyrDefn
outData.Destroy()
return outShp
def feat_count(shp, gisApi='pandas'):
"""
Count the number of features in a feature class
API'S Available:
* gdal;
* arcpy;
* pygrass;
* pandas;
"""
if gisApi == 'ogr':
from osgeo import ogr
from gasp.prop.ff import drv_name
data = ogr.GetDriverByName(drv_name(shp)).Open(shp, 0)
lyr = data.GetLayer()
fcnt = int(lyr.GetFeatureCount())
data.Destroy()
elif gisApi == 'arcpy':
import arcpy
fcnt = int(arcpy.GetCount_management(lyr).getOutput(0))
elif gisApi == 'pygrass':
from grass.pygrass.vector import VectorTopo
open_shp = VectorTopo(shp)
open_shp.open(mode='r')
fcnt = open_shp.num_primitive_of(geom)
elif gisApi == 'pandas':
from gasp.fm import tbl_to_obj
gdf = tbl_to_obj(shp)
fcnt = int(gdf.shape[0])
del gdf
else:
raise ValueError('The api {} is not available'.format(gisApi))
return fcnt
def clip_rst(raster, clipShp, outRst, nodataValue=None):
"""
Clip Raster using GDAL WARP
"""
from gasp import exec_cmd
from gasp.prop.ff import drv_name
outcmd = exec_cmd((
"gdalwarp {ndata}-cutline {clipshp} -crop_to_cutline "
"-of {ext} {inraster} -overwrite {outrst}"
).format(
clipshp=clipShp, inraster=raster, outrst=outRst,
ext=drv_name(outRst),
ndata="-dstnodata {} ".format(
str(nodataValue)) if nodataValue else ""
))
return outRst
def rst_val_to_points2(pntShp, listRasters):
"""
Pick raster value for each point in pntShp
"""
from osgeo import ogr
from gasp import goToList
from gasp.prop.ff import drv_name
listRasters = goToList(listRasters)
shp = ogr.GetDriverByName(
drv_name(pntShp)).Open(pnt, 0)
lyr = shp.GetLayer()
pntDict = {}
for feat in lyr:
geom = feat.GetGeometryRef()
x, y = geom.GetX(), geom.GetY()
l = []
for rst in listRasters:
img = gdal.Open(rst)
geo_transform = img.GetGeoTransform()
band = img.GetRasterBand(1)
px = int((x - geo_transform[0]) / geo_transform[1])
py = int((y - geo_transform[3]) / geo_transform[5])
value = band.ReadAsArray(px, py, 1, 1)
l.append(list(value)[0])
del img, geo_transform, band, px, py
pntDict[feat.GetFID()] = l
shp.Destroy()
return pntDict
def get_extent(shp, gisApi='ogr'):
"""
Return extent of a Vectorial file
Return a tuple object with the follow order:
(left, right, bottom, top)
API'S Available:
* ogr;
* arcpy;
"""
if gisApi == 'ogr':
from osgeo import ogr
from gasp.prop.ff import drv_name
from decimal import Decimal
dt = ogr.GetDriverByName(drv_name(shp)).Open(shp, 0)
lyr = dt.GetLayer()
extent = lyr.GetExtent()
dt.Destroy()
EXT = [Decimal(x) for x in extent]
elif gisApi == 'arcpy':
import arcpy
descObj = arcpy.Describe(shp)
EXT = [
descObj.extent.XMin, descObj.extent.XMax, descObj.extent.YMin,
descObj.extent.YMax
]
else:
raise ValueError('The api {} is not available'.format(gisApi))
return EXT
def get_buffer_radius(bfShp, isFile=None):
"""
Return the radius of a buffer boundary in meters.
The layer must be only one feature
"""
from osgeo import ogr
if isFile:
bfshp = ogr.GetDriverByName(drv_name(bfShp)).Open(bfShp, 0)
bfLyr = bfShp.GetLayer()
feat = bfLyr[0]
geom = feat.GetGeometryRef()
else:
geom = ogr.CreateGeometryFromWkt(bfShp)
center = geom.Centroid()
c = 0
for pnt in geom:
if c == 1:
break
pnt_aux = pnt
c += 1
x_center, y_center = (center.GetX(), center.GetY())
x_aux, y_aux = (pnt_aux.GetX(), pnt_aux.GetY())
dist = ((pnt_aux.GetX() - x_center)**2 +
(pnt_aux.GetY() - y_center)**2)**0.5
del center
if isFile:
bfShp.Destroy()
return round(dist, 0)
def coords_to_boundary(topLeft, lowerRight, epsg, outshp):
"""
Top Left and Lower Right to Boundary
"""
import os
from gasp.oss import get_filename
from gasp.prop.prj import get_sref_from_epsg
boundary_points = [(topLeft[0], topLeft[1]), (lowerRight[0], topLeft[1]),
(lowerRight[0], lowerRight[1]),
(topLeft[0], lowerRight[1]), (topLeft[0], topLeft[1])]
shp = ogr.GetDriverByName(drv_name(outshp)).CreateDataSource(outshp)
lyr = shp.CreateLayer(get_filename(outshp),
get_sref_from_epsg(epsg),
geom_type=ogr.wkbPolygon)
outDefn = lyr.GetLayerDefn()
feat = ogr.Feature(outDefn)
ring = ogr.Geometry(ogr.wkbLinearRing)
for pnt in boundary_points:
ring.AddPoint(pnt[0], pnt[1])
polygon = ogr.Geometry(ogr.wkbPolygon)
polygon.AddGeometry(ring)
feat.SetGeometry(polygon)
lyr.CreateFeature(feat)
feat.Destroy()
shp.Destroy()
return outshp
def ogr_buffer(geom, radius, out_file, srs=None):
"""
For each geometry in the input, this method create a buffer and store it
in a vetorial file
Accepts files or lists with geom objects as inputs
"""
from osgeo import ogr
from gasp.mng.prj import ogr_def_proj
from gasp.prop.ff import drv_name
from gasp.prop.prj import get_sref_from_epsg
# Create output
buffer_shp = ogr.GetDriverByName(
drv_name(out_file)).CreateDataSource(out_file)
buffer_lyr = buffer_shp.CreateLayer(
os.path.splitext(os.path.basename(out_file))[0],
get_sref_from_epsg(srs) if srs else None,
geom_type=ogr.wkbPolygon)
featDefn = buffer_lyr.GetLayerDefn()
if type(geom) == list:
for g in geom:
feat = ogr.Feature(featDefn)
feat.SetGeometry(draw_buffer(g, radius))
buffer_lyr.CreateFeature(feat)
feat = None
buffer_shp.Destroy()
elif type(geom) == dict:
if 'x' in geom and 'y' in geom:
X = 'x'
Y = 'y'
elif 'X' in geom and 'Y' in geom:
X = 'X'
Y = 'Y'
else:
raise ValueError(('Your geom dict has invalid keys. '
'Please use one of the following combinations: '
'x, y; '
'X, Y'))
from gasp.to.geom import create_point
feat = ogr.Feature(featDefn)
g = create_point(geom[X], geom[Y], api='ogr')
feat.SetGeometry(draw_buffer(g, radius))
buffer_lyr.CreateFeature(feat)
feat = None
buffer_shp.Destroy()
if srs:
ogr_def_proj(out_file, epsg=srs)
elif type(geom) == str or type(geom) == unicode:
# Check if the input is a file
if os.path.exists(geom):
inShp = ogr.GetDriverByName(drv_name(geom)).Open(geom, 0)
lyr = inShp.GetLayer()
for f in lyr:
g = f.GetGeometryRef()
feat = ogr.Feature(featDefn)
feat.SetGeometry(draw_buffer(g, radius))
buffer_lyr.CreateFeature(feat)
feat = None
buffer_shp.Destroy()
inShp.Destroy()
if srs:
ogr_def_proj(out_file, epsg=srs)
else:
ogr_def_proj(out_file, template=geom)
else:
raise ValueError('The given path does not exist')
else:
raise ValueError('Your geom input is not valid')
return out_file
