Reading the geometry type: type ID always 0?

[Vectorial1024]

Recently, I have been trying to convert a GeoJSON file to an OSM file using ogr2osm, and also learn more about ogr2osm.

I am following the hints in #36 to extract the elevation of points, but I noticed an inconsistency, as shown below:

class TestTranslation(ogr2osm.TranslationBase):
    def filter_feature(self, ogrfeature, layer_fields, reproject):
        geom_name = ogrfeature.GetGeometryRef().GetGeometryName()
        # can show e.g. LINESTRING

        geom_type = ogrfeature.GetGeometryRef().GetGeometryType()
        # always 0, which seemingly does not correspond to any of the OGRwkbGeometryType values

Is it normal to have geometry type to be always 0 when I am reading from a GeoJSON?

[roelderickx]

Type 0 corresponds to the constant wkbUnknown. Assuming you are starting from a geojson file, what type is your feature?

I tried with

    [ ... ]
      "geometry": {
        "type": "LineString",
        "coordinates": [ ... ]

and a slightly modified translation file

class TestTranslation(ogr2osm.TranslationBase):
    def filter_feature(self, ogrfeature, layer_fields, reproject):
        geom_name = ogrfeature.GetGeometryRef().GetGeometryName()
        print("name: %s" % geom_name)
        # can show e.g. LINESTRING

        geom_type = ogrfeature.GetGeometryRef().GetGeometryType() + 2**32 # convert to unsigned
        # always 0, which seemingly does not correspond to any of the OGRwkbGeometryType values
        print("type: %d" % geom_type)

Resulting in

name: LINESTRING
type: 2147483650

where 2147483650 corresponds to wkbLineString25D (I added the third dimension to all coordinates to investigate another issue)

[roelderickx]

Did you find out where the 0 came from? Was it due to the necessary conversion to an unsigned int or a wrong format while printing? Something with the input file which wasn't correct?