Highly Accurate Topographic Mapping from Satellite PhotoSat has invented a process that generates the most accurate topographic surveys from satellite, with elevation accuracies better than 30cm. Our accuracies have been proven using tens of thousands of ground control points, and proof of accuracy studies are on our website. Our 50cm contours and 1m topographic grids (DEMs) are used by engineers in the mining and oil and gas industries to shorten project timelines and eliminate survey delays. We have completed more than 500 topographic mapping projects around the world. This engineering quality accuracy means our surveys are an ideal alternative to ground surveying and LiDAR.