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Guard against trying to subsample >100% of the data #53

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May 24, 2024
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Guard against trying to subsample >100% of the data #53

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5 changes: 4 additions & 1 deletion pyshepseg/tiling.py
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Original file line number Diff line number Diff line change
Expand Up @@ -171,8 +171,11 @@ def fitSpectralClustersWholeFile(inDs, bandNumbers, numClusters=60,
# We will try to sample roughly this many pixels
dfltTotalPixels = 1000000
totalImagePixels = inDs.RasterXSize * inDs.RasterYSize
# subsampleProp is the proportion of rows and columns sampled
# subsampleProp is the proportion of rows and columns sampled (hence
# sqrt of total proportion).
subsampleProp = numpy.sqrt(dfltTotalPixels / totalImagePixels)
# Must be <= 1, i.e. sampling 100% of the data
subsampleProp = min(1, subsampleProp)
# subsamplePcnt is the percentage of total pixels sampled
subsamplePcnt = 100 * subsampleProp**2
else:
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