Apply Earth Gravitational Model Problem

Microwave Toolbox
#1

For “Apply Earth Gravitational Model” function, I have some question follow:

1.Should “Apply Earth Gravitational Model” use for every external DEM I input, if not, when should I do it?

I notice that this option doesn’t exist in “Topographic Phase Removal” both snap and gpt, but it is here in “Interferogram Formation”, is it a bug? or “Apply Earth Gravitational Model” just not unnecessary for “Topographic Phase Removal”?

#2

Apply Earth Gravitation Model is discussed, in this Topic

and in this Topic2