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Re-categorize most DEMs as DSM, improve DEM definition
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Based on the discussion in Issue #2
#2
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@DahnJ
DahnJ committed Jul 27, 2022
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# Introduction
A [Digital Elevation Model](https://en.wikipedia.org/wiki/Digital_elevation_model) (DEM) represents the elevation of the terrain.
A [Digital Elevation Model](https://en.wikipedia.org/wiki/Digital_elevation_model) (DEM) represents the elevation of the surface.


### DEM vs DSM vs DTM
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### Summary
| Dataset | Type | Horizontal resolution (m) | Vertical accuracy (m) | Data collection period | Method | Notes |
|:------------------|:-------|:----------------------------|:------------------------|:-------------------------|:-----------------------|:--------------------------------------------------|
| ASTER GDEM V3 | DTM | 30 | 17 | 2000-2011 | Photogrammetry | |
| SRTM DEM V3 | DTM | 30 USA, 90 outside | 9 | 2000 | InSAR | Coverage between 60° north and 56° south latitude |
| NASADEM | DTM | 30 | | 2000 | InSAR | Reprocessing of SRTM |
| ASTER GDEM V3 | DSM | 30 | 17 | 2000-2011 | Photogrammetry | |
| SRTM DEM V3 | DSM | 30 USA, 90 outside | 9 | 2000 | InSAR | Coverage between 60° north and 56° south latitude |
| NASADEM | DSM | 30 | | 2000 | InSAR | Reprocessing of SRTM |
| AW3D30 | DSM | 30 | 5 | 2006-2011 | Photogrammetry | |
| COPERNICUS GLO-30 | DSM | 30 | 4 | 2011-2015 | InSAR | Based on WorldDEM |
| MERIT | DTM | 90 | 12 | 2000, 2006-2011 | InSAR + Photogrammetry | Created from SRTM + AW3D30 |
| MERIT | DSM | 90 | 12 | 2000, 2006-2011 | InSAR + Photogrammetry | Created from SRTM + AW3D30 |
| FABDEM | DTM | 30 | 1.12-2.88 (mean error) | 2011-2015 | InSAR | Used ML to remove buildings+trees from GLO-30 |
| TanDEM-X 90m | DSM | 90 | 10 | 2010-2015 | InSAR | |

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