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Coordinate Reference Systems

1. What is a Coordinate Reference System ?

In delair.ai the Coordinate Reference System (CRS) will indicate what reference is used for the horizontal and altitude/height coordinates.

Using the coordinates, a CRS establishes the relationship between the 2D information and the actual physical world location.


2. Set site CRS

The first thing to do is to choose the CRS of the Site.

The Site CRS can be defined during the site creation or later and it is editable for managers  in Site info panel.



Note :If a user decide to launch a photogrammetry , CRS system is initialize by default with Site CRS, if not defined, it will be filled automatically with local UTM zone


3. Set image CRS

When you proceed with uploading a new survey, after dropping the pictures during the image selection.

  • If the picture have metadatas, the input CRS will be filled automatically.
  •  If not, after adding the geolocation coordinates file (generally in a csv file), choose the appropriate formatting source and the File CRS :


4. Photogrammetry CRS


Every time the platform user is requesting a photogrammetry processing, delair.ai will always  request the desired output CRS system.
The output CRS system is initialized by default with Site CRS, if not defined, it will be filled automatically with local UTM zone.



Note :The output of most of DELAIR.AI analytics are delivered with the CRS of the Photogrammetry except the file that has a standard CRS (ex: GEOJSON, KML which are in standard WGS84).


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