10
votes
Make the pixel values of the DEM correspond to the actual heights
I had a similar SE-GIS question several years ago. The answer: by default, QGIS displays an estimate of the min/max values, which results in the unexpected values. To see this, open up the Min/Max ...
- 7,759
6
votes
Accepted
Create vector out of a DEM in QGIS
Instead of contour lines, create contour polygons: Menu Processing > Toolbox > Contour Polygons(see QGIS documentation).
It is a tool provided by GDAL library, needs GDAL 2.4.0 or higher (should ...
- 61.4k
4
votes
Converting 5m DTM Raster to 0.5 m resolution in QGIS
Resampling 5 m pixels into 0.5 m pixel size is waste of disk space but it may be necessary. However, with QGIS it should be possible to use the GDAL virtual format (VRT) without resampling. See the ...
- 60.5k
4
votes
Converting 5m DTM Raster to 0.5 m resolution in QGIS
The Warp (Reproject) tool will resample for you.
You need to set the Output file resolution to 0.5 in your case, and also pick an appropriate Resampling method:
- 1,730
3
votes
Accepted
Using Esri ASCII Grid as DEM + Reprojecting
Following the links you provided I downloaded the data. Opening the text file its clear that even though it ends with a txt file name extension the contents conforms to an ASCII grid interchange file ...
- 41.8k
2
votes
Converting 5m DTM Raster to 0.5 m resolution in QGIS
You can use Resampling tool from SAGA. In the field of cellsize you put the wanted output resolution (0.5m), in the Grids field you put the raster file you want to resample.
Then you can use either ...
- 150
2
votes
How to make use of a 3 band DEM for analysis?
From your screenshot, the answer is simple: you don't have a DEM. A DEM (digital elevation model) is a (most often singleband) raster where pixel values correspond to elevation. In your case, however,...
- 61.4k
1
vote
Accepted
R: Extracting data from SpatRaster using points in sf class
First you need to properly convert the RSAGA dem object to a terra raster - this involves using the header information to set the extent of the matrix as well as the coordinate system. I had a quick ...
- 59.4k
1
vote
Accepted
Correspondence of 0m elevation height of a digital elevation model (Copernicus DEM) to mean sea level
Here is the answer given by the Support team of Copernicus:
The definition of the 0 m elevation for ocean areas is not dependent on the acquisition date of the input images. Please note that the ...
- 151
Only top scored, non community-wiki answers of a minimum length are eligible