add methods to check for implicit special constants and apply scale/offset

MillionConcepts / pdr

[P]lanetary [D]ata [R]eader - A single function to read all Planetary Data System (PDS) data into Python

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add methods to check for implicit special constants and apply scale/offset #23

Closed m-stclair closed 2 years ago

m-stclair commented 2 years ago

"implicit special constants" per data type: the usual values of NULL from the PDS3 standards, NULL3 as defined in the GDAL PDS driver, and the standard ISIS special constants.