Tag Archives: aerial mapping

Satellite Imagery’s Impact

Above: The highest resolution of commercial satellite imagery is still more than an order of magnitude lower than the highest resolution attainable from aerial platforms. Keystone Aerial Surveys, Inc. developed this digital surface model from 1.75 cm digital imagery taken with a low-altitude flight. The resolution is sufficiently high to enable its use for mapping...

SGM

Obtaining economical and accurate point clouds from semi-global matching. In the old days, mappers were thrilled with 30 meter USGS digital elevation models (DEMs). These were available for almost everywhere in the United States. Years later they started producing 10m DEMs, and life was really good. We had one elevation point “on the ground” every...