kopia lustrzana https://github.com/OpenDroneMap/WebODM
44 wiersze
1.3 KiB
Python
44 wiersze
1.3 KiB
Python
# Export a raster index after applying a band expression
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import rasterio
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import re
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import numpy as np
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import numexpr as ne
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from rasterio.enums import ColorInterp
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from rio_tiler.utils import has_alpha_band
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def export_raster_index(input, expression, output):
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with rasterio.open(input) as src:
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profile = src.profile
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profile.update(
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dtype=rasterio.float32,
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count=1,
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nodata=-9999
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)
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data = src.read().astype(np.float32)
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alpha_index = None
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if has_alpha_band(src):
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try:
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alpha_index = src.colorinterp.index(ColorInterp.alpha)
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except ValueError:
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pass
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bands_names = ["b{}".format(b) for b in tuple(set(re.findall(r"b(?P<bands>[0-9]{1,2})", expression)))]
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rgb = expression.split(",")
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arr = dict(zip(bands_names, data))
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arr = np.array([np.nan_to_num(ne.evaluate(bloc.strip(), local_dict=arr)) for bloc in rgb])
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# Set nodata values
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index_band = arr[0]
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if alpha_index is not None:
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index_band[data[alpha_index] == 0] = -9999
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# Remove infinity values
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index_band[index_band>1e+30] = -9999
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index_band[index_band<-1e+30] = -9999
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with rasterio.open(output, 'w', **profile) as dst:
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dst.write(arr)
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