Estoy intentando crear un shapefile poligonal a partir de una lista de coordenadas utilizando herramientas de código abierto de python. Lo siguiente es lo que tengo hasta ahora que fue hackeado juntos desde el Libro de cocina GDAL/OGR de Python y este GIS SE responde .
Hay una pregunta similar Python: ¿Cómo crear un Shapefile poligonal a partir de una lista de coordenadas X,Y? aunque esta pregunta se refiere al uso de pyshp
. Sin embargo, estoy interesado en crear un shapefile de polígonos utilizando únicamente las herramientas gdal/ogr de Python.
import ogr
def create_polygon(coords):
ring = ogr.Geometry(ogr.wkbLinearRing)
for coord in coords:
ring.AddPoint(coord[0], coord[1])
# Create polygon
poly = ogr.Geometry(ogr.wkbPolygon)
poly.AddGeometry(ring)
return poly.ExportToWkt()
def write_shapefile(poly, out_shp):
"""
https://gis.stackexchange.com/a/52708/8104
"""
# Now convert it to a shapefile with OGR
driver = ogr.GetDriverByName('Esri Shapefile')
ds = driver.CreateDataSource(out_shp)
layer = ds.CreateLayer('', None, ogr.wkbPolygon)
# Add one attribute
layer.CreateField(ogr.FieldDefn('id', ogr.OFTInteger))
defn = layer.GetLayerDefn()
## If there are multiple geometries, put the "for" loop here
# Create a new feature (attribute and geometry)
feat = ogr.Feature(defn)
feat.SetField('id', 123)
# Make a geometry, from Shapely object
geom = ogr.CreateGeometryFromWkb(poly.wkb)
feat.SetGeometry(geom)
layer.CreateFeature(feat)
feat = geom = None # destroy these
# Save and close everything
ds = layer = feat = geom = None
def main(coords, out_shp):
poly = create_polygon(coords)
write_shapefile(poly, out_shp)
if __name__ == "__main__":
coords = [(-106.6472953, 24.0370137), (-106.4933356, 24.05293569), (-106.4941789, 24.01969175), (-106.4927777, 23.98804445), (-106.4922614, 23.95582128), (-106.4925834, 23.92302327), (-106.4924068, 23.89048039), (-106.4925695, 23.85771361), (-106.4932479, 23.82457675), (-106.4928676, 23.7922049), (-106.4925072, 23.75980241), (-106.492388, 23.72722475), (-106.4922574, 23.69464296), (-106.4921181, 23.6620529), (-106.4922734, 23.62926733), (-106.4917201, 23.59697561), (-106.4914134, 23.56449628), (-106.4912558, 23.5319045), (-106.491146, 23.49926362), (-106.4911734, 23.46653561), (-106.4910181, 23.43392476), (-106.4910156, 23.40119976), (-106.4909501, 23.3685223), (-106.4908165, 23.33586566), (-106.4907735, 23.30314904), (-106.4906954, 23.27044931), (-106.4906366, 23.23771759), (-106.4905894, 23.20499124), (-106.4905432, 23.17226022), (-106.4904748, 23.1395177), (-106.4904187, 23.10676788), (-106.4903676, 23.07401321), (-106.4903098, 23.04126832), (-106.4902512, 23.00849426), (-106.4901979, 22.97572025), (-106.490196, 22.97401001), (-106.6481193, 22.95609832), (-106.6481156, 22.95801668), (-106.6480697, 22.99082052), (-106.6480307, 23.02362441), (-106.6479937, 23.0563977), (-106.6479473, 23.0891833), (-106.647902, 23.12196713), (-106.6478733, 23.15474057), (-106.6478237, 23.18750353), (-106.6477752, 23.22026138), (-106.6477389, 23.25302505), (-106.647701, 23.28577123), (-106.6476562, 23.31851549), (-106.6476211, 23.3512557), (-106.6475745, 23.38397935), (-106.6475231, 23.41671055), (-106.6474863, 23.44942382), (-106.6474432, 23.48213255), (-106.6474017, 23.51484861), (-106.6474626, 23.54747418), (-106.647766, 23.57991134), (-106.6482374, 23.61220905), (-106.6484783, 23.64467084), (-106.6482308, 23.6775148), (-106.6479338, 23.7103854), (-106.6478395, 23.74309074), (-106.6472376, 23.77618646), (-106.6472982, 23.80876072), (-106.647127, 23.84151129), (-106.6471277, 23.8741312), (-106.6473995, 23.90656505), (-106.6473138, 23.93916488), (-106.6473408, 23.97172031), (-106.6473796, 24.00435261), (-106.6472953, 24.0370137)]
out_shp = r'X:\temp\polygon.shp'
main(coords, out_shp)
Este es el error que he recibido:
runfile('X:/temp/corner_detection.py', wdir='X:/temp')
Traceback (most recent call last):
File "<ipython-input-40-952256a990f1>", line 1, in <module>
runfile('X:/temp/corner_detection.py', wdir='X:/temp')
File "C:\Program Files (x86)\Anaconda2\lib\site-packages\spyder\utils\site\sitecustomize.py", line 866, in runfile
execfile(filename, namespace)
File "C:\Program Files (x86)\Anaconda2\lib\site-packages\spyder\utils\site\sitecustomize.py", line 87, in execfile
exec(compile(scripttext, filename, 'exec'), glob, loc)
File "X:/temp/corner_detection.py", line 48, in <module>
main(coords, out_shp)
File "X:/temp/corner_detection.py", line 43, in main
write_shapefile(poly, out_shp)
File "X:/temp/corner_detection.py", line 20, in write_shapefile
layer = ds.CreateLayer('', None, ogr.wkbPolygon)
AttributeError: 'NoneType' object has no attribute 'CreateLayer'
Estoy convencido de que el problema tiene algo que ver con intentar leer un shapely
geometría. ¿Cómo puedo crear un shapefile de polígonos a partir de una lista de coordenadas utilizando únicamente las herramientas de gdal/ogr python?