[gdal-dev] get GCP from noaa L1b

[Andrew Brooks]

Hi

>From memory the l1b driver doesn't use enough points to get proper
geolocation because it sub-samples the 51 which are provided in the l1b
file. The best solution (that recommended by NOAA) is to use lagrange
interpolation across the 51 points. A lagrange algorithm has been provided
in the ticket you referenced but nobody has added it to gdal. I think at the
moment you could consider the l1b driver broken.

Andrew
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