On Wed, Nov 15, 2017 at 1:36 PM, Helmut Kudrnovsky <[email protected]> wrote: > > Background of the question in subject: the GRASS algs in upcoming QGIS3 are > working with v.external linked data. > > I've seen some modules doesn't work with such kind of data. > > Is there maybe a list already available?
It depends also on the format that is linked in with v.external. For all formats that do not have a key column (e.g. shapefile), attributes are not accessible, and attributes would get lost when modifying the geometries.Therefore it is generally not safe to link vector data with v.external. In many cases it does not make sense to use v.external linked data with simple features, instead vector data should be imported to get true topology. If upcoming QGIS3 is working with v.external linked data, the GRASS interface of QGIS is effectively broken. Markus M
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