How to check if a pair of longitude and latitude is within an irregular circle?

I have an irregular circle with know boundary values (longitude and latitude). Imagine it is the boundary of Mediterranean Sea.

After some interpolation work, I want to cut off any interpolated values that are outside this circle. I am thinking to do this by checking each of the interpolated values. My question is how do I check if a data set is within this circle or not?

Thanks.

Answer 1

[Sean de Wolski]

You could try using interpm from the Mapping Toolbox along with inpolygon

[Leon]

Thank you very much. This sounds great!