1. Description

The Coordinate Reference System (CRS) refers to which geospatial reference system is used to assign horizontal coordinates and vertical elevation values to visualized data.

A CRS establishes the relationship between the 2D information and the actual physical world location using the coordinates.

2. Set Site CRS

Setting the CRS used for a Site is the first step to take when creating a Site on the platform.

The Site CRS can be defined in a couple of ways:

•  During the Site Creation‍.

• Or later in the Site Info Panel (manager role required)

3. Set image CRS

Set image CRS when uploading a survey (Upload Survey), or after the selected images have been uploaded.

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

4. Photogrammetry CRS

Every time a platform user requests photogrammetry processing, Alteia will always request the desired output CRS system.

IMPORTANT: The output of most of Alteia analytics is delivered with the CRS of the Photogrammetry except for a file that has a standard CRS (ex: GEOJSON, KML which are in standard WGS84)

5. Consult the Site CRS

The site CRS is displayed on the Site Info Panel.