All Questions
382
questions
0
votes
1
answer
54
views
QGIS point sampling misses data on edge of raster (possible bug?)
It seems I may have discovered a shortcoming in the way QGIS handles raster sampling in points. Since yesterday evening (18/7), one small issue has begun to elude me (during my comeback geofictional ...
- 61
1
vote
0
answers
40
views
Why does my raster look different after clipping it by a mask layer using QGIS?
I have a Digital Elevation Model of Europe and I want to clip it to the extent of Germany. To do so, I am using Clip Raster by Mask Layer with the external frontier of Germany as the mask layer. ...
- 65
1
vote
1
answer
51
views
QGIS DEM to elevation Points, pixels not centred
I have a DEM which I'm trying to convert into a point layer in QGIS. I used the raster pixels to points tool, which seemed to work, except that the points are not in the centre of the DEM pixels. They ...
- 71
0
votes
1
answer
40
views
QGIS: Set two raster to the same height
I have 2 DEM raster in QGIS. I want to merge them, but they have a difference in height of approx. 9m. This means that when I merge them, there is a kind of break-off edge at the transition. Can I ...
- 85
0
votes
0
answers
20
views
Choose DEM layer as terrain in 3D view using PyQGIS
I saw that many 3D classes and methods have been exposed to PyQGIS so I was wondering if choosing a raster layer as a terrain was now possible. I'm working on QGIS version 3.36.1.
This is the GUI ...
- 15
0
votes
0
answers
14
views
Information in addition to Raster zonal statistics
I have a layer of polygons and a DSM. I want to know if I can extract average aspect, slope, and elevation statistics all at once in QGIS. I know another software does this but I forgot the name.
- 111
0
votes
1
answer
31
views
QGIS - transfer outcrop pixels from a DEM raster onto another raster surface at a lower level
In QGIS I would like a solution that will transfer pixels from a DEM raster onto another raster surface at a lower level. I am trying to create 2 geological surfaces, one being ground level (GL) and ...
- 49
0
votes
0
answers
21
views
DEM update/interpolation algorithm from control points
Context: I have a reference DEM, and Icesat-2 points covering some parts of it. The DEM is from 2012 and the Icesat-2 points range from 2018 to 2023.
Goal: I am looking for a way to 'update' the ...
- 309
0
votes
1
answer
36
views
Combine Slope and Aspect of a DEM for suitiable PV-Powerplants
I want to get areas for PV-Powerplants via QGIS.
I used the solution under Filter for south pointing areas from a DEM for extraction of the areas which are not facing north (60-300°).
But I need ...
- 677
1
vote
1
answer
73
views
QGIS DEM (Raster) merge: errors
I'm trying to merge 4 tiles (ASC) of a French 1m digital elevation model.
Files are loaded in QGIS, they bear no errors, value range is coherent.
Merging comes with errors and the result is a raster ...
- 405
1
vote
2
answers
136
views
How to export an IDW DTM as a GeoTIFF file in R
I have loaded both raster and lidR packages within RStudio and I am trying to export the IDW DTM files but have been receiving errors about 'format'. I have exported a TIN DTM already however with IDW ...
- 13
3
votes
1
answer
202
views
Separation of DSM as Building DSM and Canopy Height Model in QGIS
I am currently trying to separate the DSM as Building DSM and Canopy Height Model. I also have DTM, Building Footprint data.
Digital Surface Model
Building Footprints.
For separation I converted the ...
3
votes
1
answer
181
views
Reading GeoTIFF from path and converting it into PostGIS raster data type
I need to read the raster file (DEM) from path directory and turn it into PostGIS raster data type. I formed this SQL query:
SELECT ST_FromGDALRaster(pg_read_binary_file('D:\dems\img.tif'))
FROM ...
- 43
1
vote
1
answer
244
views
Reprojecting raster in QGIS moves all values to completely different range
This question has been asked here multiple times. And every time, it seems that the people offering answers don't understand the magnitude of what's happening. When I reproject a DEM raster with this ...
- 157
0
votes
0
answers
60
views
What is the hatch marking of my produced terrain slope raster?
I’ve been piecing together DEM raster data from different sources, in an attempt to create a terrain slope raster. I’m using ArcGIS Pro to merge the DEM’s together and then using the split raster tool ...
- 1