JezK
Edit File: get_soundg.py
#!/usr/bin/env python3 ############################################################################### # $Id$ # # Project: OGR Python samples # Purpose: Extract SOUNDGings from an S-57 dataset, and write them to # Shapefile format, creating one feature for each sounding, and # adding the elevation as an attribute for easier use. # Author: Frank Warmerdam, warmerdam@pobox.com # ############################################################################### # Copyright (c) 2003, Frank Warmerdam <warmerdam@pobox.com> # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the "Software"), # to deal in the Software without restriction, including without limitation # the rights to use, copy, modify, merge, publish, distribute, sublicense, # and/or sell copies of the Software, and to permit persons to whom the # Software is furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER # DEALINGS IN THE SOFTWARE. ############################################################################### import sys from osgeo import ogr ############################################################################# def Usage(): print("Usage: get_soundg.py <s57file> <shapefile>") print("") return 2 def main(argv=sys.argv): if len(argv) != 3: return Usage() s57filename = argv[1] shpfilename = argv[2] # - # Open the S57 file, and find the SOUNDG layer. ds = ogr.Open(s57filename) src_soundg = ds.GetLayerByName("SOUNDG") # - # Create the output shapefile. shp_driver = ogr.GetDriverByName("ESRI Shapefile") shp_driver.DeleteDataSource(shpfilename) shp_ds = shp_driver.CreateDataSource(shpfilename) shp_layer = shp_ds.CreateLayer("out", geom_type=ogr.wkbPoint25D) src_defn = src_soundg.GetLayerDefn() field_count = src_defn.GetFieldCount() # - # Copy the SOUNDG schema, and add an ELEV field. out_mapping = [] for fld_index in range(field_count): src_fd = src_defn.GetFieldDefn(fld_index) fd = ogr.FieldDefn(src_fd.GetName(), src_fd.GetType()) fd.SetWidth(src_fd.GetWidth()) fd.SetPrecision(src_fd.GetPrecision()) if shp_layer.CreateField(fd) != 0: out_mapping.append(-1) else: out_mapping.append(shp_layer.GetLayerDefn().GetFieldCount() - 1) fd = ogr.FieldDefn("ELEV", ogr.OFTReal) fd.SetWidth(12) fd.SetPrecision(4) shp_layer.CreateField(fd) ############################################################################# # Process all SOUNDG features. feat = src_soundg.GetNextFeature() while feat is not None: multi_geom = feat.GetGeometryRef() for iPnt in range(multi_geom.GetGeometryCount()): pnt = multi_geom.GetGeometryRef(iPnt) feat2 = ogr.Feature(feature_def=shp_layer.GetLayerDefn()) for fld_index in range(field_count): feat2.SetField(out_mapping[fld_index], feat.GetField(fld_index)) feat2.SetField("ELEV", pnt.GetZ(0)) feat2.SetGeometry(pnt) shp_layer.CreateFeature(feat2) feat2.Destroy() feat.Destroy() feat = src_soundg.GetNextFeature() ############################################################################# # Cleanup shp_ds.Destroy() ds.Destroy() return 0 if __name__ == "__main__": sys.exit(main(sys.argv))