Suggestions on how to generate a mask

I have a matrix that is 1440x2880 of remote sensed temperatures from satallites, i was wondering if there is any way that i can mask all the data points in the United States. To make this clearer, i would like to create a matrix full of 0's and cells in the United cells will be expressed by 1's for example. But i was wondering if there is a way to do this

[Geoff Hayes]

Ahmed - what do the dimensions of your matrix, 1440x2880, represent? Latitude and longitude? How would you correlate US positions to the matrix?

[Ahmed Abdulla]

yup they basically represent the latitude and longitude, thats what im stuck on, i dont really know how to correlate them.

Answer 1

[Steven Lord]

If you have Mapping Toolbox, read the data file containing the borders of the states (see the "Enter MATLAB" section of this blog post) and ask if the points in your temperature data are inside the union of the polyshape array containing all the states. The isinterior function will help you do that last step.