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# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import os.path as osp
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import numpy as np
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import argparse
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from PIL import Image
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from utils import Raster
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try:
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from osgeo import gdal, ogr, osr
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except ImportError:
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import gdal
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import ogr
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import osr
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def _mask2tif(mask_path, tmp_path, proj, geot):
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mask = np.asarray(Image.open(mask_path))
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if len(mask.shape) == 3:
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mask = mask[:, :, 0]
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row, columns = mask.shape[:2]
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driver = gdal.GetDriverByName("GTiff")
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dst_ds = driver.Create(tmp_path, columns, row, 1, gdal.GDT_UInt16)
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dst_ds.SetGeoTransform(geot)
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dst_ds.SetProjection(proj)
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dst_ds.GetRasterBand(1).WriteArray(mask)
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dst_ds.FlushCache()
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return dst_ds
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def _polygonize_raster(mask_path, shp_save_path, proj, geot, ignore_index):
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tmp_path = shp_save_path.replace(".shp", ".tif")
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ds = _mask2tif(mask_path, tmp_path, proj, geot)
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srcband = ds.GetRasterBand(1)
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maskband = srcband.GetMaskBand()
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gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES")
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gdal.SetConfigOption("SHAPE_ENCODING", "UTF-8")
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ogr.RegisterAll()
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drv = ogr.GetDriverByName("ESRI Shapefile")
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if osp.exists(shp_save_path):
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os.remove(shp_save_path)
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dst_ds = drv.CreateDataSource(shp_save_path)
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prosrs = osr.SpatialReference(wkt=ds.GetProjection())
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dst_layer = dst_ds.CreateLayer("Building boundary", geom_type=ogr.wkbPolygon, srs=prosrs)
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dst_fieldname = "DN"
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fd = ogr.FieldDefn(dst_fieldname, ogr.OFTInteger)
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dst_layer.CreateField(fd)
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gdal.Polygonize(srcband, maskband, dst_layer, 0, [])
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lyr = dst_ds.GetLayer()
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lyr.SetAttributeFilter("DN = '{}'".format(str(ignore_index)))
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for holes in lyr:
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lyr.DeleteFeature(holes.GetFID())
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dst_ds.Destroy()
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ds = None
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os.remove(tmp_path)
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def raster2shp(srcimg_path, mask_path, save_path, ignore_index=255):
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src = Raster(srcimg_path)
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_polygonize_raster(mask_path, save_path, src.proj, src.geot, ignore_index)
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src = None
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parser = argparse.ArgumentParser(description="input parameters")
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parser.add_argument("--srcimg_path", type=str, required=True, \
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help="The path of original data with geoinfos.")
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parser.add_argument("--mask_path", type=str, required=True, \
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help="The path of mask data.")
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parser.add_argument("--save_path", type=str, default="output", \
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help="The path to save the results shapefile, `output` is the default.")
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parser.add_argument("--ignore_index", type=int, default=255, \
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help="It will not be converted to the value of SHP, `255` is the default.")
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if __name__ == "__main__":
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args = parser.parse_args()
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raster2shp(args.srcimg_path, args.mask_path, args.save_path, args.ignore_index)
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