I am quite new to the topic of handling geodata, so I face my first big challenge now:
I downloaded an osm file containing information about any kind of data related to power generators, transformer stations etc. (http://enipedia.tudelft.nl/wiki/Extracting_Power_Data_from_OpenStreetMap). I successfully loaded this file to QGIS, where I started using the
save as option to simply save it as a shapefile. This worked fine for points and lines, but not for multipolygons and multilines. As I think I know now it´s because shapefiles do not support these types (correct?). So I tried an advice from our forum to use the geometry tool multi to onepart. But now when I try this I get the error
len() should return >= 0 See log for more details
Has anybody faced the same problem? My overall goal here is just to use this dataset as a shapefile.
Update: Maybe also an relevant information is that the properties of the layer display "Number of objects in this layer: -1"