How to use coordinate systems in Pix4Dmatic

 
Note: At the moment it is only possible to set the GCPs coordinate system. The coordinate system of images and the project are determined automatically either based on the camera model of imported images or based on the selected GCPs coordinate system.

Image coordinate system

The horizontal image coordinate system in Pix4Dmatic is automatically set to WGS84 - EPSG:4326.

The vertical coordinate system is automatically defined based on the camera model of imported images:

  • WGS84 - EPSG 7030 ellipsoid for images taken with DJI Phantom 4 RTK, senseFly AeriaX, S.O.D.A., S.O.D.A. 3D, and S.O.D.A. Corridor cameras.
  • EGM96 - EPSG 5773 geoid model for all other camera models.

For more information see Which cameras are supported in Pix4Dmatic article

GCPs coordinate system

Both the horizontal coordinate system and the vertical coordinate system can be defined in the GCP table.

Pix4Dmatic_import_GCPs.jpg

To select the horizontal coordinate reference system:

  • In the Horizontal coordinate reference system dialog, search or copy-paste:
    • The name or
    • The EPSG code of the coordinate system.

To select the vertical coordinate reference system:

  • In the Vertical coordinate reference system dialog, search or copy-paste:
    • The name or
    • The EPSG code of the coordinate system.
  • (Optional) Geoid: If the selected vertical coordinate system supports geoids and the geoid model is available in the Pix4Dmatic database, select the geoid model in the drop-down list.
  • (Optional) Geoid height: If the selected vertical coordinate system supports geoids but the geoid model is not available in the Pix4Dmatic database, enter the value of the geoid height at that location.
     
    Note: The Geoid height value is used to convert the image geolocation (WGS 84 ellipsoid or EGM96 geoid) into the desired project coordinate system.

For more information and the list of supported geoids see How to use Geoids in Pix4Dmatic article.

Project coordinate system

 
Tip: The project coordinate system is always visible on the bottom bar: Pix4Dmatic_project_coordinate_system_bar.jpg

The horizontal and vertical coordinate system of the project is defined based on the imported image geolocation or based on selected GCPs coordinate system:

  • When GCPs are not used, the project coordinate system is automatically defined based on the position of the image geolocation. The corresponding UTM zone is used. The vertical coordinate system is always set to ellipsoidal heights.
     
    Example: When importing images with image geolocation in Switzerland the automatically assigned project coordinate system is:
    • Horizontal: WGS 84 / UTM zone 32N - EPSG 32632.
    • Vertical: WGS 84 - EPSG 7030 ellipsoid.
  • When GCPs are used, the project coordinate system corresponds to the GCPs coordinate systems. If the GCPs coordinate system is geographic the corresponding UTM zone is used for the project coordinate system.
     
    Example: When importing images with image geolocation in Switzerland and defining the GCPs coordinate system as CH1903+ / LV 95 - EPSG 2056 with ellipsoidal heights, the project coordinate system is:
    • Horizontal: CH1903+ / LV 95 - EPSG 2056.
    • Vertical: Bessel 1841 - EPSG 7004 ellipsoid.

Horizontal grid corrections and transformations

Pix4Dmatic supports the most common horizontal grid corrections and transformations.

The corrections will be used automatically based on the selected coordinate systems.

 
Information: Please contact support if you have additional questions regarding horizontal grid corrections and transformations or if you believe that the transformation you need is not included or precise enough.
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