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Coordinate Reference Systems

1. What is a Coordinate Reference System ?

In the Coordinate Reference System (CRS) will indicate what reference is to be used for the horizontal and altitude/height information recorded in the images metadata.

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

2. Setting the appropriate Coordinate Reference Systems

2.1. Images Vertical Coordinates Systems at Upload

During a new upload (either when creating a new project or adding fresh data to an existing project), the user will be prompted for the Vertical Coordinates System. Select the appropriate geoid or ellipsoid model acting as reference for the altitude/height information contained in the Images dataset and function of the type of drone used. This selection is done through the drop-down menu :

2.2. Project CRS Edition

After having selected the images and proceeding to next step, the project CRS in horizontal (x,y) and vertical (z) options will be displayed. From this step it is possible to edit CRS for (x,y) and z options:

Note: this option is available if your company is not linked to, and if you did not perform previous processing on this project. Select Edit CRS

Horizontal CRS may need to be changed : Select the Edit button. For example this may be useful to change the EPSG zone for the appropriate one.

Enter the EPSG zone or select the appropriate one from the drop-down list. Use the Select button to attach this zone.

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