Before making a large, memory-taxing data grid, you should first determine what its size will be. If you know the latitude and longitude limits of a region, you can calculate the size of the raster by creating a referencing object, for any desired map resolution and scale.
Specify the latitude and longitude limits for the region. This example calculates the size of a map of the continental U.S. at a scale of 10 cells per degree.
latlim = [ 25 50]; lonlim = [-130 -60];
Specify the extent of the data grid using cells per degree.
cellsPerDegree = 10; extent = 1/cellsPerDegree;
Construct a referencing object and verify that the size of the raster is reasonable (in this case, 250 by 700 cells).
R = georefcells(latlim,lonlim,extent,extent); R.RasterSize
ans = 1×2 250 700