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Fix RSLC valid data mask when L0B starts with a block of invalid data (NSDS-5279) #344

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Fix RSLC valid data mask when L0B starts with a block of invalid data (NSDS-5279) #344

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8 changes: 7 additions & 1 deletion python/packages/nisar/products/readers/Raw/Raw.py
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Original file line number Diff line number Diff line change
Expand Up @@ -962,8 +962,14 @@ def getSubSwathBboxes(self, frequency, polarization=None, epoch=None, num_ignore

changes = get_dwp_change_indices(rd, wd, wl)

# Skip any blocks of bad data at the beginning (e.g., first 12 pulses
# of SSAR). Note that argmax returns the first occurence of the max
# value, in this case the first index where any subswath is not empty.
i0 = np.argmax(np.any(subswaths[..., 1] > subswaths[..., 0], axis=0))

# Append first and last pulses to generate pairs of constant DWP.
breaks = np.hstack(([0], changes, [grid.shape[0] - 1]))
# Sort this in case i0 is after first change.
breaks = np.sort(np.hstack(([i0], changes, [grid.shape[0] - 1])))
bbox_lists = []
for ibreak in range(len(breaks) - 1):
ipulse0, ipulse1 = breaks[ibreak], breaks[ibreak + 1]
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