netcdf/grib - support flipped data on Lat (Y) axis in rasdaman

[Bang Pham Huu]

From ​https://gdal.org/drivers/raster/netcdf.html

NetCDF files are usually assumed “bottom-up”, contrary to GDAL’s model which is “north up”

• By convention, netCDF is flipped on Lat (Y ) axis with South on top and North at the bottom. E.g, geo coordinates in Lat axis:

-90
-80
...
80
90

• While with GDAL 2D GeoTiff, the data is North on top and South at the bottom. E.g, geo coordinates in Lat axis:

90
80
...
-80
-90

The problem is, if one imports a flipped GRIB/netCDF to rasdaman and later extracts it as 2D image PNG/TIFF, the output will be up-side down.

[Bang Pham Huu]

It is done via the new flip() operator in rasql.