Created
January 2, 2018 16:29
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Demonstrate `rasterio` windowing bug
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import rasterio | |
from rasterio.mask import mask | |
import fiona | |
import numpy as np | |
test_filename = 'test_rasterio_mask.tif' | |
test_image = 128 * np.ones((1, 1000, 2000), dtype=np.uint8) | |
test_transform = rasterio.Affine(-0.05, 0.07, 15000, | |
0.07, 0.05, 3500000) | |
test_crs = {'init': 'epsg:32614'} | |
out_meta = {'driver': 'GTiff', | |
'height': test_image.shape[1], | |
'width': test_image.shape[2], | |
'transform': test_transform, | |
'crs': test_crs, | |
'count': 1, | |
'dtype': np.uint8, | |
'compress': 'lzw'} | |
with rasterio.open(test_filename, 'w', **out_meta) as dest: | |
dest.write(test_image) | |
test_shape = [{'geometry': {'coordinates': [[(15010, 3500110), | |
(14980, 3500130), | |
(14975, 3500100), | |
(15000, 3500095), | |
(15010, 3500110)]], | |
'type': 'Polygon'}, | |
'id': '0', | |
'type': 'Feature'}] | |
# write the shape out | |
test_schema = {'geometry': 'Polygon', 'properties': {'id': 'int'}} | |
test_shapefile_name = 'test_rasterio_mask.shp' | |
with fiona.open(test_shapefile_name, 'w', | |
'ESRI Shapefile', test_schema, | |
crs=test_crs) as out_shape: | |
out_shape.write({'geometry': test_shape[0]['geometry'], | |
'properties': {'id': 3}}) | |
with rasterio.open(test_filename) as src: | |
out_image, out_transform = mask(src, [test_shape[0]['geometry']], crop=True) | |
out_meta = src.meta.copy() | |
out_image[out_image > 0] += 100 | |
out_meta.update({'height': out_image.shape[1], | |
'width': out_image.shape[2], | |
'transform': out_transform}) | |
crop_filename = 'test_rasterio_cropped.tif' | |
with rasterio.open(crop_filename, 'w', **out_meta) as dest: | |
dest.write(out_image) |
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