How to process a PIX4Dmapper site calibration file into PIX4Dmatic

This article describes the steps needed to import a PIX4Dmapper site calibration file in PIX4Dmatic, which enables the ability to work in a local coordinate system and transform points between the local and global coordinate reference systems.

IN THIS ARTICLE

Export the PIX4Dmapper site Calibration file

Create a new PIX4Dmatic project

Import the WKT file into PIX4Dmatic

Process the project

Note: This feature is available from the 1.62 version of PIX4Dmatic or newer.

Tip: Well-known text (WKT) is a string that defines all necessary parameters of a coordinate system. Save a projection file (.prj) of any coordinate system and open it in a text editor to see its WKT. For example:

PROJCRS["WGS 84 / UTM zone 32N",
    BASEGEOGCRS["WGS 84",
        DATUM["World Geodetic System 1984",
            ELLIPSOID["WGS 84",6378137,298.257223563,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4326]],
    CONVERSION["UTM zone 32N",
        METHOD["Transverse Mercator",
            ID["EPSG",9807]],
        PARAMETER["Latitude of natural origin",0,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",9,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",0.9996,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",500000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["(E)",east,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["(N)",north,
            ORDER[2],
            LENGTHUNIT["metre",1]],
    ID["EPSG",32632]]

Export the PIX4Dmapper site calibration file

To export the site calibration parameters from PIX4Dmapper follow these steps:

Ensure the project uses images with precise GPS geolocation.
Set up the output coordinate system as an arbitrary coordinate system.
Compute the site calibration parameters.
Click on Export.

Create a new PIX4Dmatic project

Open PIX4Dmatic.
Create a new project and import the image files/folder.

For more information: Create a project - PIX4Dmatic.

Import the WKT file into PIX4Dmatic

From the new PIX4Dmatic project:

Tap the edit icon in the Tie points tab.
Select the Import CRS file option.
- Select the site-localized point_collection_name.wkt file for import.
Click Apply .

With the WKT file successfully imported, the project will display the localized point collection
name as the project's coordinate reference system in the lower left corner of the PIX4Dmatic window.

Process the project

With an imported .wkt file, process as usual. If GCPs need to be added, they should be measured and marked in the local reference system. The points collected should be different from those used to localize the project.

For more information: How to use coordinate systems - PIX4Dmatic