SNAP documentation

Re-mapping lat-lon tool

Originally, it was planned to put all the data on a 1.5 degree by 1.5 degree grid, and a C++ executable was written to do this. This executable can be found in /home/users/stringer/snap/code and is called remapLatLon. The only argument is requires is the input filename and it produces a similarly named file with the extension _remap.nc. For example,

remapLatLon prodf_rs_sfc_apa_14_20121229_20121229_009.nc

will produce the file prodf_rs_sfc_apa_14_20121229_20121229_009_remap.nc, where all the data in prodf_rs_sfc_apa_14_20121229_20121229_009.nc, from the two lat-lon grids in this file, are put onto a 1.5 degree by 1.5 degree lat-lon grid.

The code uses a linear interpolation to map onto the new grid. And the values at the poles are determined by averaging all the longitude values for the nearest latitude level - and so the value of a variable at 90 degrees and -90 degrees should be the same for all longitudes.