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#!/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))
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