Image: GPS World

About William Tewelow, GISP

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Tewelow is a former intelligence specialist with the U.S. Navy. He also served a special assignment at the U.S. Department of Transportation and is currently a manager with the U.S. Federal Aviation Administration. Contact him at

Posts by William Tewelow, GISP

A straightforward explanation of oblique Posted on 01 Aug 2019 in the From the Magazine categories.

How are oblique views derived from aerial imagery? Typically, a camera takes a field of view of 120 degrees (+/– 60 degrees either side of centerline). The nadir is straight... Read more»

Drones, swarms, artificial intelligence and virtual reality now rule Posted on 10 May 2017 in the Defense & Opinions & UAV/UGV categories.

Add small sats, gamification and nanotechnology, and you've got a bunch of powerful new drivers pushing out geospatial frontiers in every direction. These exciting tools are opening up new market sectors and bringing powerful techniques to military and other applications. Read more»