[netcdf-java] How to project/transform variables on the fly

• To: "netcdf-java@xxxxxxxxxxxxxxxx" <netcdf-java@xxxxxxxxxxxxxxxx>
• Subject: [netcdf-java] How to project/transform variables on the fly
• From: "Dahn, Nikolas" <nikolas.dahn@xxxxxxxxxxxxxxxxxxxxxx>
• Date: Wed, 20 Jul 2016 14:25:28 +0000

Hello!

I'm developing an application module which should import a GRIB(2) file, select 
a subset of the variables and save them to a NetCDF file.

My problem is that some of the variables use rotated lat/lon. They seem to be 
correctly encoded (i.e. the dimensions have the standard_name 
"grid_latitude"/"grid_longitude" set and there's a reference variable with 
grid_mapping_name, grid_north_pole_latitude and -longitude set correctly), but 
I have to convert them to regular lat/lon and I don't know how.

My question now is: given a Variable object with Dimension i,j in rotated 
lat/lon, what do I have to do to convert it to regular lat/lon? At this point 
in the program I don't care about the actual values.

Thanks in advance!
Nikolas

• Follow-Ups:
  • Re: [netcdf-java] How to project/transform variables on the fly
    • From: Ben Caradoc-Davies