Thank you so much for the advice! It worked beautifully. I do have another question though, since we have 800+ points per animal is it possible to run the viewshed function once and get accurate results? Does it calculate line by line? We are worried that by running all the points together there will be overlapping results, making it look like animal A and animal B can see the same areas, even though they really could not. However picking out 10 points at a time would be very time consuming. Thanks for your help! sara
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