METplus Practical Session Guide (Version 5.0) | MET Tool: Gen-Vx-Mask > Run Data and Solar Types

On this page, we provide examples for land/sea mask and also a solar altitude to show where it is daytime on a global grid.

Run Gen-Vx-Mask on the command line using the following command:

A corresponding water mask could be created using two different methods. One way is to simply rerun the land mask command above using the -complement option:

Another way is to specify a different threshold (eq1 instead of eq0) rather than taking the complement:

Now we'll run Gen-Vx-Mask to show where it’s daytime on a global grid:

Next, combine the LAND output from the previous run with the solar altitude mask for daytime:

This creates a mask for grid points on land experiencing daylight at 18:30 UTC on 20170601.

On the next page, we'll demonstrate using the "track" and "circle" masking types.