[gdal-dev] generating multipolygon from polygons

[neojp]

Dear List,

I need to generate a multipolygon by adding all the polygons in a shapefile.
Based on a previous post I plan to use the addgeometry() to pass each
feature to the multipolygon layer. I have implemented this in python but I
cannot figure out what is going wrong.  Python says "'Geometry' object has
no attribute 'addGeometry'" that i can understand but not really know how to
fix. Below is the code, I would appreciate any help.


import ogr, os, sys
driver=ogr.GetDriverByName('ESRI Shapefile')

#open shape
shapefileName= 'c:\\test_multi\\polygonize_binary.shp'
dataset=driver.Open(shapefileName,0)
fn = 'c:\\test_multi\\multi_out.shp'
if os.path.exists(fn):
  driver.DeleteDataSource(fn)
outDS = driver.CreateDataSource(fn)
if outDS is None:
  print 'Could not create file'
  sys.exit(1)

#Create a layer to receive the multiple geometry 
#create a layer
outLayer = outDS.CreateLayer('multi_out', geom_type=ogr.wkbMultiPolygon)
# create new id and fields in the output shapefile
#add a new feature
# create an empty multipolygon geometry
m_poly = ogr.Geometry(ogr.wkbMultiPolygon)

layer=dataset.GetLayer()
for index in xrange(layer.GetFeatureCount()):
    feature = layer.GetFeature(index)
    geometry = feature.GetGeometryRef()
    #print geometry
    m_poly.addGeometry(geometry)



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