Subgroup 3 concentrated on applying the methodological framework developed within the other subgroups. Specifically, it aimed at making available to a wider audience one tool for the visualisation of the results of the inter-comparison of DEMs. This will be achieved by providing open-source tools and performance tests in a variety of geographical regions around the world in order to demonstrate and verify the applicability of the DEM inter-comparison approach.

Furthermore, subgroup 3 will help to define the minimum standards and requirements regarding user access, data availability, programming interfaces and processing power, to which open candidate platforms should comply in order to host DEM benchmarking activities. Finally, this subgroup will be in charge of implementing and monitoring DEM benchmarking and comparison at global scale.

The subgroup generated two open-source tools:

• Demix Operations Platform: https://visioterra.org/DemixOperationsPlatform/
• VtWeb platform: https://visioterra.org/VtWeb/

A new tiling system

• DEMIX 10k Tile Data Set: https://zenodo.org/records/7504791

A published a peer-reviewed paper in support of its mandate:

Best BiCubic Method to Compute the Planimetric Misregistration between Images with Sub-Pixel Accuracy: Application to Digital Elevation Models, S. Riazanoff et al., ISPRS Int. J. Geo-Inf., 13(3), 96, 2024

Best Practice Guidelines for the evaluation of DEM products

• DEM Quality Assessment Guidelines v1.0