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Local Coordinate Systems in AirGon’s ASP Suite

Author: Geocue, August 8, 2018

Using Loki, AirGon’s precision positioning system, very accurate georeferenced imagery can be collected using DJI drones over an area of interest. The positions from which those photos are captured are output from the ASP Suite workflow as geographic locations, described by latitude, longitude, and altitude coordinates. Image-to-point cloud software applications such as Agisoft PhotoScan and Pix4D make these into accurate 3D models and support conversion to projected coordinate systems. Those projected systems change latitudes and longitudes into easting and northing coordinates, which are much more practical for surveying tasks. However, the supported systems are limited to national and state grids or other predefined systems. A common example would be the U.S. State Plane system. While great for the exchange of data between GIS applications, many sites have large-scale projected systems defined just over the local site, which does not match existing national and state grids. We refer to these as local coordinate systems, and while local easting and northing image locations can be input to PhotoScan, Pix4D, etc., those applications do not support converting geographic coordinates to local projected coordinates.

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