__init__.py 文件源码

def _get_vector_attributes(self,ds,attrs):
        logging.debug("[FileMan][_get_vector_attributes]")

        layer = ds.GetLayer()

        # extent
        extent = layer.GetExtent()
        logging.debug("[FileMan][_get_vector_attributes] Extent: %s" % repr(extent) )
        attrs["extent"] = (extent[0],extent[2],extent[1],extent[3])

        # features count
        attrs["features_count"] = layer.GetFeatureCount()

        # geom type
        ftype = layer.GetGeomType()
        if ftype == ogr.wkbPolygon:    #3
            attrs["type"] = "polygon"
        elif ftype == ogr.wkbPoint:    #1
            attrs["type"] = "point"
        elif ftype == ogr.wkbLineString:   #2
            attrs["type"] = "line"
        elif ftype == ogr.wkbPolygon25D:
            attrs["type"] = "polygon"
        else: 
            attrs["type"] = "none/unknown"  # 0 or anything else

        # srs
        sr = layer.GetSpatialRef()
        logging.debug("[FileMan][_get_vector_attributes] Spatial Reference from layer.GetSpatialRef() : %s" % repr(sr) )
        if sr:
            attrs["prj"]= self._get_prj(sr)
        else:
            attrs["prj"] = "unknown"

        # Done
        return attrs