GEDTM30 – A Global 1-Arc-Second (~30m) Digital Terrain Model (DTM)
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https://github.com/openlandmap/GEDTM30 <-- shared GitHub repository
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#GIS #spatial #mapping #opendata #global #DTM #GEDTM30 #GitHub #30m #landsurface #parameters #documentation #hydrology #remotesensing #earthobservation #slope #geomorphons #hillshade #geomorphometry #geomorphology #topography #Equi7 #terrainheight #DigitalTerrainModel #landform
[Canadian] National Elevation Data Strategy Newsletter [NRCAN]
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https://gogeomatics.ca/national-elevation-data-strategy-a-significant-coverage-increase/ <-- shared technical newsletter
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#GIS #spatial #mapping #remotesensing #LiDAR #elevation #opendata #airborneLiDAR #AutomaticallyExtractedBuildings #buildingfootprints #Canada #CanElevation #CGVD2013 #CopernicusDEM #dataacquisition #digitalelevationmodel #DEM #Digitalsurfacemodel #DigitalTerrainModel #DSM #DTM #elevationproducts #FloodHazardMapping #geographicdata #highresolutiondata #HRDEM #HRDEMmosaic #PointCloud #mediumresolutionelevationmodel #MRDEM #NAD83 #NationalElevationDataStrategy #NRCAN #topographicaldata #vectorformat #flood #flooding #extremeweather #climatechange #naturalhazard #risk #hazard #datacoverage
@NRCAN
"Oops" appears to apply widely.
These are not small errors (says Capt. Obvious). Used to drive physics of various applications, surely a signficant source of inaccuracy?
"Application to real-world landscapes in California, reveal the systematic underestimation of surface area by up to a third, and mean slope angles by up to 10° in steep topography in current DTMs."
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GL109517?af=R
Greg Cocks 