id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc 2403,[PATCH] NOAA level 1b geolocation interpolation,arb,dron,"The current noaa level 1b geolocation relies on sparse GCPs. This might be fine when reprojecting a small area but when reprojecting a whole swath width it produces significant errors. It might be better if the GCPs were interpolated inside the driver and returned as a geolocation array, or if a new Lagrangian interpolation method was added to GDAL. See ticket 2388: http://trac.osgeo.org/gdal/ticket/2388 although the sample code there doesn't handle the case where longitude wraps around (360 back to 0), or switches sign (180 to -180). When copying the 51 longitudes into a 2048-element array (prior to interpolation) it would be advisable to check for a difference > 180 compared to the previous longitude and just continue with the same magnitude/sign, then perform some modulo function after interpolation. Hope that helps! ",defect,closed,normal,1.10.2,GDAL_Raster,svn-trunk,normal,fixed,AVHRR L1B,Markus Neteler jurien spareeth mmetz