How do I mask out the ocean in m_map?

I am plotting data that is over both land and ocean using m_map, but I only want the data over land to show up. Is there a way I can mask out the ocean (maybe by color filling everything outside of m_coastline instead of inside m_coastline)? I know there has to be a way to do this but I cannot figure it out. I've even tried using m_shaperead and using a shapefile of the ocean but couldn't get it that way either.

Answer 1

[KSSV]

See the discussion:

http://in.mathworks.com/matlabcentral/newsreader/view_thread/91769

[Silver]

KSSV The link does not work :/

[ahamahoru]

yes it's no longer available :(

[Image Analyst]

The Mathworks shutdown their newsreader. Try Google or Google Groups.

[Hitachi]

The way i did is

Download the land-ocean-mask martix, lile land.nc from NCEPRI.

Then set land grid = 1 and ocean grid = NaN.

Finally, multiply the matrix to the data.