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How to verify coordinate systems in PIX4Dcloud projects

This article explains how to verify that the image geolocation, output coordinate system, and Ground Control Point (GCP) / Check Point (CP) coordinate system are correctly defined in PIX4Dcloud. Ensuring consistency between these coordinate systems is essential for accurate georeferencing, correct map positioning, and reliable measurements.

Licenses: Licenses: This article is valid for PIX4Dcloud Starter and PIX4Dcloud Pro licenses (formerly PIX4Dcloud Advanced).

Roles: Only Owners, Managers, and Editors can create and process datasets in PIX4Dcloud.

Coordinate systems used in PIX4Dcloud

PIX4Dcloud projects can involve up to three different coordinate systems, depending on the processing workflow and license type.

1) Image coordinate system

The image coordinate system refers to the geolocation embedded in the input images.

  • PIX4Dcloud expects images to be geotagged in WGS84 (latitude, longitude, ellipsoidal height).

  • After import, images are projected onto a background map.

  • If the image coordinate system is correct, the images appear in the correct geographic position on the map.

If the images are incorrectly located, the image geolocation should be verified before proceeding with processing.

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2) Output coordinate system

The output coordinate system defines how the results—orthomosaic, DSM, point cloud, and 3D mesh—are produced.

  • It is selected during the Coordinate Reference System step of the dataset creation wizard.

  • By default, PIX4Dcloud automatically proposes a projected coordinate system based on the image geolocation.

  • Unless a project has specific requirements, the default coordinate system is recommended and sufficient.

Selecting an incorrect output coordinate system may result in misaligned outputs or inaccurate measurements.

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3) GCP and Check Point coordinate system

(PIX4Dcloud Pro only)

The GCP and CP coordinate system applies when Ground Control Points or Check Points are used.

  • GCPs and CPs must be provided in the same coordinate system as the output coordinate system.

  • During the GCPs Automation step, both the images and GCPs/CPs are displayed on a background map.

  • If the coordinate systems are correct, the images and control points appear in the correct relative positions.

This visual verification step is the most reliable way to confirm coordinate system consistency.

For more details on GCP processing, see: How to use the AutoGCP feature. 

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Warning: When using GCPs or CPs, PIX4Dcloud does not support mixing coordinate systems. Control points must be provided in the same coordinate system used for the outputs. It is not possible to define GCPs/CPs in one coordinate system and generate outputs in another.