Stephen Woodbridge wrote > Hi All, > > I have a shapefile(s) and I want to read the features, generate some > metrics about each feature and then add them to the that feature. I'm > using python and one obvious way to to in effect create a new shapefile > with the columns I need to add, then copy the existing shapefile to the > new one adding the additional metrics. > > I wondering if I can add the new columns to the shapefile, then do a > read and update. > > Pros and cons to these approaches? and how to do the later one if > possible? > > I looked at the python gdal/ogr cookbook and didn't this specific > example. But I thinking of something along the lines of: > > 1. open the dataset for read/write > 2. layer.CreateField() to add the new fields > 3. loop through the features in the layer > 4. and use feature.SetField() > 5. and feature = None to commit the changes > > will this work? > > Thanks, > -Steve
Hi, You can demonstrate that it is possible with ogrinfo: ogrinfo -sql "alter table test add column foo integer" test.shp ogrinfo -dialect sqlite -sql "update test set foo=2" test.shp -Jukka Rahkonen- -- View this message in context: http://osgeo-org.1560.x6.nabble.com/gdal-dev-Is-it-possible-to-add-new-fields-to-a-shapefile-and-populate-then-tp5315568p5315579.html Sent from the GDAL - Dev mailing list archive at Nabble.com. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
