...

The macro can now write this to disk, return it to the user interface or process it further using all the available geopoints functions. 

ASCII Lat / Long Matrices

Have a look at the supplied Lat Long Matrix file with the edit action. This is a simple text format for storing regularly-spaced geographical matrix data, which Metview can directly import. As soon as you do anything with this file (e.g. visualise or examine), Metview internally converts it into GRIB format (leaving the original file untouched). In this way, we can import such data into Metview and have access to all its GRIB/fieldset functionality.