libera_utils.footprint_matching.sources#
The ancillary readers active in one FMATCH run.
build_sources() instantiates one reader per source the operational mode’s
product uses, over the granules staged for it, and returns them keyed by reader
registry key. A footprint’s native samples of a source come from that reader’s
samples_in(),
matched to the footprint time by its
TimeMatch policy. No cache is kept
here: each reader holds its source once (a static reader its whole indexed body of
data, a stepped reader the one hourly step nearest the current footprint, a pass
reader the hourly granules within MAX_TIME_OFFSET of the current footprint).
A staged granule that cannot be read raises from the first samples_in call that
loads it, and the run stops: a product with a source silently missing would be wrong,
and a crash gets noticed.
Functions
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Instantiate the readers active for |
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Check that |