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5 votes
Accepted

130 TIF DEM file (total size 3 GB) become 7.4 GB TIF file after merging. Why?

Most times when raster processing output is a lot larger than the raster inputs, the cause is different compression settings. Namely, the input rasters used significantly stronger compression than the ...
Houska's user avatar
  • 8,196
1 vote

DEM < 10 Meters - Greece

If you use QGIS, there is a pre-installed worldwide DEM under XYZ-tiles, called Mapzen global terrain. For Greece, there seems to be a resolution of ca. 4 m. You can load it in QGIS as raster layer ...
Babel's user avatar
  • 73.1k
1 vote

Way of creating "fake" DEM data in QGIS

The SAGA gis toolkit has some commands for generating raster grids via various methods. For example, you can generate some sort of Gaussian noise grid: using the SAGA command: saga_cmd ...
Spacedman's user avatar
  • 65k

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