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# Emulates GDAL's gdal_polygonize.py
import argparse
import logging
import subprocess
import sys
import fiona
import rasterio
from rasterio.features import shapes
logging.basicConfig(stream=sys.stderr, level=logging.INFO)
logger = logging.getLogger('rasterio_polygonize')
def main(raster_file, vector_file, driver, mask_value):
with rasterio.Env():
with rasterio.open(raster_file) as src:
image = src.read(1)
if mask_value is not None:
mask = image == mask_value
else:
mask = None
results = (
{'properties': {'raster_val': v}, 'geometry': s}
for i, (s, v)
in enumerate(
shapes(image, mask=mask, transform=src.transform)))
with fiona.open(
vector_file, 'w',
driver=driver,
crs=src.crs,
schema={'properties': [('raster_val', 'int')],
'geometry': 'Polygon'}) as dst:
dst.writerecords(results)
return dst.name
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description="Writes shapes of raster features to a vector file")
parser.add_argument(
'input',
metavar='INPUT',
help="Input file name")
parser.add_argument(
'output',
metavar='OUTPUT',
help="Output file name")
parser.add_argument(
'--output-driver',
metavar='OUTPUT DRIVER',
help="Output vector driver name")
parser.add_argument(
'--mask-value',
default=None,
type=int,
metavar='MASK VALUE',
help="Value to mask")
args = parser.parse_args()
name = main(args.input, args.output, args.output_driver, args.mask_value)
print(subprocess.check_output(
['ogrinfo', '-so', args.output, name]))
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