Select by attribute using fiona

Question

 with fiona.open(constants.file_combined, 'r') as source:
 filtered = filter(lambda f: f['properties']['NAME'] == name_dm1, source)
 # **source.meta is a shortcut to get the crs, driver, and schema
 # keyword arguments from the source Collection.
 with fiona.open(out_dir + os.sep + name_dm1 + '.shp', 'w', **source.meta) as sink:
 for feature in filtered:
 try:
 sink.write(feature)
 except Exception, e:
 # Writing uncleanable features to a different shapefile
 # is another option.
 print out_dir + os.sep + name_dm1 + '.shp'

I have a shapefile from which I want to select based on presence of certain values in a column called 'NAME'.

However, in the code above, it creates a shapefile with an empty attribute table even though I am sure there is data in the original shapefile.

Answer 1

Much more easily:

with fiona.open("a_shapefile.shp") as input:
 meta = input.meta
 with fiona.open('a_shapefile2.shp', 'w',**meta) as output:
 for feature in input:
 if feature['properties']['NAME']== name_dm1:
 output.write(feature)

• bugmenot123: Might be nice to use filter() as in gis.stackexchange.com/questions/91676/… / toblerity.org/fiona/manual.html#slicing-and-masking-iterators