I want to create a new MultiPolygon shapefile, I tried this code

Mp_Layer = QgsVectorLayer('MultiPolygon?crs=EPSG:26191', 'layer', 'memory')

But when I check the wkt_geom if the created shapefile its gives a polygon type.

It’s possible to create a Multipolygon directly by PyQGIS?

  • 3
    The layer is type polygon but the geometry stored in it can be multipolygon, which indicates the geometry has multiple parts, either exterior rings or interior rings (holes). Although qgis.org/pyqgis/3.4/core/QgsVectorLayer.html indicates that the memory provider can have type “point”, “linestring”, “polygon”, “multipoint”,”multilinestring”,”multipolygon” I suspect, without digging too deep into the source code, that linestring = multilinestring and polygon = multipolygon for the constructor (point != multipoint - special case) in keeping with OGC standards for geometry storage. – Michael Stimson Nov 12 '19 at 22:57
  • Thanks for your answer, i want to know if i can change the geometry Type from Polygon to MultiPolygon or create a new shapefile file as MultiPolygon. That because i have already made many function based on Wkt of MultiPolygon type. – REDA DRISSI-EL-BOUZAIDI Nov 13 '19 at 10:52
  • 1
    I had similar issues with shapefiles being created with the wrong wkt. gis.stackexchange.com/a/259762/56050 I was using the QgsVectorFileWriter, and I'm not sure if it's related, but there may be some info there that may be helpful. – TJ Rockefeller Nov 19 '19 at 16:06

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