Brief
Quebec's 10-metre land-cover map behaves most like ESA WorldCover, preprint comparison reports
A preprint compares Quebec's provincial COTQ land-cover product with three global 10-metre datasets and reports it is structurally and spectrally closest to ESA WorldCover. The evidence available is the abstract of that posting; the comparison rests on eight satellite tiles and reports relative positioning rather than an accuracy verdict.
Researchers compared the COTQ, a Quebec-wide 10-metre land-cover product, with three global 10-metre datasets: ESA WorldCover, ESRI LandCover and Google DynamicWorld. All four were harmonised under a common legend and assessed using object-size distributions, shape complexity, Adjusted Rand Index, Intersection over Union, spectral separability metrics from Sentinel-2 reflectance, and a targeted photo-interpretation of areas where the products disagree.
The comparison covered eight Sentinel-2 tiles chosen to represent Quebec's main bioclimatic domains, from temperate and boreal forest to northern tundra. The authors report COTQ as structurally and spectrally closest to ESA WorldCover, with systematic differences traced to class definitions and thematic priorities, notably for urban areas, wetlands, and rocky or cryptogamic surfaces. The paper states it introduces no new mapping methodology, and the sample is eight tiles.
Our reading
For this desk the useful part is that the source explicitly does not claim a new mapping method; it characterises how an existing provincial product behaves alongside global ones. That matters to anyone in Quebec using land-cover layers to monitor land occupation or soil artificialisation, because product choice determines which classes are dependable, especially wetlands and urban edges. The res…
What to do or watch
Watch for a peer-reviewed version and for evaluations extending beyond the eight bioclimatic tiles. The unresolved question the evidence leaves open is how far these class-definition differences would shift a specific monitoring decision, such as tracking artificialisation.
Source details and supporting facts
Each line is stated by the page named above it.
Stated by arXiv
- The comparison covers eight Sentinel-2 tiles selected to represent the main bioclimatic domains of Quebec, from temperate and boreal forests to northern tundra environments.
- All products are harmonised under a common legend and compared using structural indicators, spectral separability metrics derived from Sentinel-2 reflectance data, and a targeted photo-interpretation of disagreement areas.
- The study presents a systematic evaluation of the COTQ product relative to three global 10-m LULC datasets: ESA WorldCover, ESRI LandCover, and Google DynamicWorld.
- This paper does not introduce a new mapping methodology but focuses on analysing the behaviour and consistency of the COTQ.
Sources
- arXivText stored 17 September 2026
How this story was checked. Written from the 1 page listed above, stored 17 September 2026; claims checked against that stored text on 17 September 2026.
What that means
- 4 of 4 reported statements were confirmed against the page that carries them; the rest were removed rather than published.
- Figures in the text were required to appear in the stored source text: yes. Identifiers: yes.
- The check reads stored text only: no claim rests on a fresh look that did not happen.
- Where the reporting was silent, the text says so instead of filling the gap.