How to save a figure as a geotiff

Im only seeing examples online of saving images as geotifs, I plotted a surface which is bounded by lat and longs. The surface is interpolated from a bunch of singlebeam points, and I can save it as a text file but it only saves the data for the actual points, not the entire surface. What I want to do is save the entire surface so it could be quickly thrown into GIS. Any ideas on where to start with this? Thanks again!

Answer 1

[Walter Roberson]

geotiffwrite from the Mapping Toolbox

But I don't know what it means to save an "entire" surface, as distinct from the points that make it up.