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Use Coordinate Systems

By default the software will process results in the closest UTM zone, unless Ground Control Points (GCPs) are provided. When processing via the cloud platform, inclusion of a Ground Control Point File will automatically set the crs option to gcp and the results will be processed and stored in the same CRS as the GCPs.

Using the cloud platform all orthophotos, DEMs and point clouds can be reprojected and exported in different Coordinate Reference System (CRS) via their respective EPSG codes after processing has completed.

For high precision surveys however, the reprojection step described above can introduce some amount of error. Depending on the use case and geographical area, this error might or might not be acceptable. For this reason, it's possible to select an arbitrary CRS for processing which better represents the data. Data will be then natively stored in this CRS.

The crs option can be used to specify a coordinate system. It's a text field that takes in an EPSG code definition:

EPSG:<horizontal>+<vertical>(<geoid>)

With the vertical and geoid components being optional.

See crs for all possible values.

Vertical Coordinates​

By default the program will output WGS84 ellipsoidal height values. To process results with a different vertical coordinate system, use the crs option to specify a different vertical coordinate system.

Example: if a dataset's horizontal coordinate system is WGS 84 / UTM zone 15N EPSG:32615, one can instruct the program to output results in orthometric height relative to the EGM96 geoid by setting the vertical crs to EPSG:5773:

EPSG:32615+5773

Explicit geoid selection is also possible. See crs for all possible values and geoids for a list of geoids.

Units​

The software supports coordinate systems with the following units:

  • Meters
  • Feet
  • US Survey Feet