There is no source data.<p>I just iterate through each latitude from -90 to 90 and each longitude from -180 to 180 in increments of 2.5 (for both the start and end). Check out the source code for any of the 5 examples (included in the post).<p>If you'd like, post the code up somewhere and I'll be happy to run it on the same machine and post the results along with the rest.