Python osgeo.ogr.CreateGeometryFromWkb() Examples

def insertFrame(self, scale, mi, inom, frame):
        self.checkAndOpenDb()
        srid = self.findEPSG()
        geoSrid = QgsCoordinateReferenceSystem(int(srid)).geographicCRSAuthId().split(':')[-1]
        ogr.UseExceptions()
        outputDS = self.buildOgrDatabase()
        outputLayer=outputDS.GetLayerByName('public_aux_moldura_a')
        newFeat=ogr.Feature(outputLayer.GetLayerDefn())
        auxGeom = ogr.CreateGeometryFromWkb(frame)
        #set geographic srid from frame
        geoSrs = ogr.osr.SpatialReference()
        geoSrs.ImportFromEPSG(int(geoSrid))
        auxGeom.AssignSpatialReference(geoSrs)
        #reproject geom
        outSpatialRef = outputLayer.GetSpatialRef()
        coordTrans = osr.CoordinateTransformation(geoSrs, outSpatialRef)
        auxGeom.Transform(coordTrans)
        newFeat.SetGeometry(auxGeom)
        newFeat.SetField('mi', mi)
        newFeat.SetField('inom', inom)
        newFeat.SetField('escala', str(scale))
        out=outputLayer.CreateFeature(newFeat)
        outputDS.Destroy() 

def insertFrame(self, scale, mi, inom, frame):
        self.checkAndOpenDb()
        srid = self.findEPSG()
        geoSrid = QgsCoordinateReferenceSystem(int(srid)).geographicCRSAuthId().split(':')[-1]
        ogr.UseExceptions()
        outputDS = self.buildOgrDatabase()
        outputLayer=outputDS.GetLayerByName(self.getFrameLayerName())
        newFeat=ogr.Feature(outputLayer.GetLayerDefn())
        auxGeom = ogr.CreateGeometryFromWkb(frame)
        #set geographic srid from frame
        geoSrs = ogr.osr.SpatialReference()
        geoSrs.ImportFromEPSG(int(geoSrid))
        auxGeom.AssignSpatialReference(geoSrs)
        #reproject geom
        outSpatialRef = outputLayer.GetSpatialRef()
        coordTrans = osr.CoordinateTransformation(geoSrs, outSpatialRef)
        auxGeom.Transform(coordTrans)
        newFeat.SetGeometry(auxGeom)
        newFeat.SetField('mi', mi)
        newFeat.SetField('inom', inom)
        newFeat.SetField('escala', str(scale))
        out=outputLayer.CreateFeature(newFeat)
        outputDS.Destroy() 

def output_ogr(self, output):
    driver = ogr.GetDriverByName( 'ESRI Shapefile' )
    if os.path.exists( output['file_name'] ):
      driver.DeleteDataSource( output['file_name'] )
    source = driver.CreateDataSource( output['file_name'] )
    layer = source.CreateLayer( self.layer_dfn.GetName(),
                                geom_type = self.layer_dfn.GetGeomType(),
                                srs = self.layer.GetSpatialRef() )

    for field in self.fields:
      fd = ogr.FieldDefn( str(field['name']), field['type'] )
      fd.SetWidth( field['width'] )
      if 'precision' in field:
        fd.SetPrecision( field['precision'] )
      layer.CreateField( fd )

    for geometry in self.geometries:
      if geometry.geom is not None:
        feature = ogr.Feature( feature_def = layer.GetLayerDefn() )
        for index, field in enumerate(self.fields):
          if field['name'] in geometry.properties:
            feature.SetField( index, geometry.properties[field['name']].encode('utf-8') )
          else:
            feature.SetField( index, '' )
        feature.SetGeometryDirectly(
          ogr.CreateGeometryFromWkb(
            shapely.wkb.dumps(
              geometry.geom
            )
          )
        )
        layer.CreateFeature( feature )
        feature.Destroy()

    source.Destroy() 

def write_fake_tile(self,tz,tx,ty,NB_FLAGS):
        tilefilename = os.path.join(self.tmpoutput, str(tz), str(tx), "%s.%s" % (ty, self.tileext))
        # Create directories for the tile
        if not os.path.exists(os.path.dirname(tilefilename)):
            os.makedirs(os.path.dirname(tilefilename))
            
        if self.options.createtileindexshp and self.tilelayer is not None:
            self.ti_cum += 1
            tilelayerdefn = self.tilelayer.GetLayerDefn()
            feat = ogr.Feature(tilelayerdefn)
            feat.SetField('id', self.ti_cum)
            feat.SetField('zoom', tz)
            feat.SetField('tile', "%s_%s_%s" % (tz, tx, ty))
            feat.SetField('children', NB_FLAGS)
            b = self.geodetic.TileBounds(tx, ty, tz)
            geom = ogr.CreateGeometryFromWkb(makeline(b[0], b[3], b[2], b[1]).wkb)
            feat.SetGeometry(geom)
            self.tilelayer.CreateFeature(feat)
            feat = geom = None
        
        # convert to integer representation of heightmap accordind to Cesium format and append children flags byte
        tilearrayint = (numpy.zeros(4096,numpy.dtype('int16')) + 1000) * 5
        tilearrayint.tofile(tilefilename)
        child_water_bytes = struct.pack('<BB',NB_FLAGS,0x00)
        with open(tilefilename,'ab') as outfile:
            outfile.write(child_water_bytes) 

def _instantiate_geom(self,g):
        """Attempt to convert the geometry pass in to and ogr Geometry
        object.  Currently implements the base ogr.CreateGeometryFrom*
        methods and will reform fiona geometry dictionaries into a format
        that ogr.CreateGeometryFromJson will correctly handle.
        """

        if isinstance(g,ogr.Geometry):
            # If the input geometry is already an ogr object, create a copy
            # of it.  This is requred because of a subtle issue that causes
            # gdal to crash if the input geom is used elsewhere.  The working
            # theory is that the geometry is freed when going out of a scope
            # while it is needed in the upper level loop.  In this code, the
            # problem comes about between self.iter_vector and self.get_data
            # with mask=True.
            return ogr.CreateGeometryFromJson(str(g.ExportToJson()))

        # Handle straight ogr GML
        try:
            return ogr.CreateGeometryFromGML(g)
        except:
            pass
        # Handle straight ogr Wkb
        try:
            return ogr.CreateGeometryFromWkb(g)
        except:
            pass
        # Handle straight ogr Json
        try:
            return ogr.CreateGeometryFromJson(g)
        except:
            pass
        # Handle straight ogr Wkt
        try:
            return ogr.CreateGeometryFromWkt(g)
        except:
            pass
        # Handle fiona Json geometry format
        try:
            gjson = str(g).replace('(','[').replace(')',']')
            return ogr.CreateGeometryFromJson(gjson)
        except:
            pass

        raise ValueError("A geometry object was not able to be created from " \
                         "the value passed in.")