DEM Intercomparison eXercise (DEMIX) - Maps of completeness criteria scores for global DEMs

Introduction This introduction gives a brief overview of the context in which the dataset has been produced. Readers curious about the detailed standards and procedures described in this section are encouraged to open the resources linked to this dataset. The Digital Elevation Model Intercomparison eXercise (DEMIX) This work is part of the Digital Elevation Model Intercomparison eXercise (DEMIX), initiated by the Committee on Earth Observation Satellites (CEOS). This initiative aims at "providing harmonised terminology and methods, as well as practical guidelines and results allowing the intercomparison of continental or global Digital Elevation Models (DEM)" (Strobl et al., 2021). Several publications have defined the framework of DEMIX, from the terminology and definitions (Guth et al., 2021) to the DEM ranking methods (Bielski et al., 2024). An additional methodology paper has been publicated regarding the assessment of planimetric displacements between DEMs (Riazanoff et al., 2024), which are a common source of biases in DEM comparisons. The DEMIX grid Studies performed within the DEMIX framework rely on the DEMIX grid (Guth et al., 2023), a geodetic grid (EPSG:4326) dividing the world in areas of approximately 10x10km. These standard areas are called DEMIX tiles, and can be precisely located thanks to their identifier. Criteria and scores Within DEMIX, several criteria have been defined to assess the quality of DEMs. These criteria take as input a DEM and a DEMIX tile, and provide as output the score of the DEM for this specific tile. Repeating this process over several DEMs and DEMIX tiles of interest allow for a comparison of scores, leading to a ranking of DEMs. DEMIX rankings are based on the Randomized Complete Block Design (RCBD) (Bielski et al., 2024). This dataset This dataset is composed of global maps of one map per (DEM, criterion) tuple. Each GeoTIFF map can be superimposed with the DEMIX grid (Guth et al., 2023) in a GIS (tested in QGIS 3.16). Completeness criteria The completeness criteria have originally been defined by Peter Strobl. A brief description of each criterion is given in the next table. Please see the column "Original document" and files of this repository for the complete definitions. Criterion Description Requirements Original document A01 - Product fractional cover Fraction of a DEMIX tile covered by the DEM product None See document "DEMIX_CDD-A01_20211103.docx" A02 - Valid data fraction Fraction of a DEMIX tile covered