interpolating lambert Conformal conic projection to regular rectangular format
Added by Poulomi Ganguli about 10 years ago
Hi,
I need to interpolate NARR data to regular rectangular format and find out latitude longitude information and corresponding data field from precipitation file. But I don't have any idea how to interpolate this irregular grid data using CDO :(. Any help will be really appreciable.
Replies (2)
RE: interpolating lambert Conformal conic projection to regular rectangular format - Added by Poulomi Ganguli about 10 years ago
My NARR data is in .nc file format with gridtype: Curvilinear and I want to interpolate my data to rectangular grid format. Thanks
RE: interpolating lambert Conformal conic projection to regular rectangular format - Added by Jaison-Thomas Ambadan about 10 years ago
Hi,
You need to create a grid description file which should look like:
gridtype = lonlat gridsize = xname = lon xlongname = longitude xunits = degrees_east yname = lat ylongname = latitude yunits = degrees_north xsize = ysize = xfirst = xinc = yfirst = yinc =
you need to fill all necessary parameters gridsize, ysize etc. then use remap operators to interpolate to regular lon-lat grid:
cdo -remapcon,mygrid ifile.nc ofile.nc
if you don't know the parameters, then create a template file of the required region; for example:
cdo -f nc -sellonlatbox,-145,-50,25,60 -remapcon,r1200x600 -topo north_america.nc
this will create a 0.3 degree lon-lat box for North American region, and use that as a grid descriptor file for interpolation:
cdo -f nc remapcon,north_america.nc ifile.nc ofile.nc
Please have a look at the CDO doc section 2.12.1 REMAPGRID - SCRIP grid interpolation for more info regarding the interpolation methods.
Cheers,
J