All Questions
58
questions
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
1
vote
0
answers
69
views
Make a slope-aspect map and create a circular legend for it in QGIS
I'm working on Terrain analysis of my ROI and could compute aspect and slope separately. Although I found a fairly easy tutorial on how to make a slope-aspect raster, I want to know if it's possible ...
- 11
3
votes
2
answers
404
views
Creating topographic "layer cake" map a.k.a. Tanaka contour in QGIS
I'm wondering if there is any way to create a map similar to the image below. Basically, it would be the contours extruded, add a singleband pseudocolor ramp as the color on top, and be able to ...
0
votes
1
answer
468
views
Google Earth Engine - slope
I am trying to use the pre-built function of GEE for calculating the slope of the terrain, but I cannot really understand how the function works, since the documentation is also not really helpful.
...
- 1
1
vote
0
answers
124
views
Creating a heightmap from hillshade/radar data?
So there are several threads explaining how to create a hillshade map from DEM. Does anyone know of a method to do the opposite? Essentially all I have is unidirectional radar data which functions ...
- 11
-1
votes
2
answers
494
views
Polygons from a raster within an elevation range
In the image below I have generated some isolines starting from the terrain model and I have filtered them within a certain elevation range 800 - 1500m of elevation in QGIS.
But I would like to make ...
- 396
2
votes
0
answers
30
views
Convert a raster to show count of cells of a given relationship to each cell
Is there a tool (QGIS preferably), that will look at every raster cell, and compare it to neighbouring (1km) cells and populate the value with a value based on relationship.
Example (and indeed the ...
- 93
2
votes
1
answer
168
views
Correspondence of 0m elevation height of a digital elevation model (Copernicus DEM) to mean sea level
I want to model future coastal flooding caused by sea-level rise under the latest IPCC scenarios at global scale. To this end, I use the Copernicus Digital Elevation Model (Copernicus DEM: https://...
- 151
2
votes
1
answer
1k
views
Using Watershed Basin from SAGA in QGIS
I have a weird phenomenon going on in QGIS.
I want to derive a channel network and also the catchment areas using "watershed basin" from SAGA. In the end I want to have the flow direction ...
- 21
0
votes
1
answer
349
views
How to interpret Terrain Ruggedness Index according to Wilson et al. (2007)?
Is there a categorical scale used to interpret values from the Terrain Ruggedness Index as calculated by Wilson et al. (2007), which is used in the raster library in R?
2
votes
0
answers
368
views
Interpreting Ruggedness Index calculated from SRTM Tiles
I am looking for help interpreting the values from Ruggedness Index calculations.
I downloaded SRTM tiles using the SRTM Downloader plugin in QGIS. Then I calculated ruggedness from SRTM tiles in QGIS ...
0
votes
1
answer
116
views
How to get elevation raster data at custom scales for a specific region?
I'm new to GIS and trying to obtain elevation data for a specific region, transformed to raster data with a custom cell size of 10 meters.
My first attempt was to download a TBDEM dataset from USGS ...
- 101
3
votes
0
answers
474
views
Using Aspect tool in QGIS
For my bachelor thesis in biology I´m working with QGIS 3.14 (Pi) and tried to create a layer where the slope aspect/expositon/exposure is presented. I´ve got a DTM1 on hands. There is this function ...
- 31
1
vote
0
answers
401
views
DSM results from WebODM are not correct [closed]
I am new to WebODM and I am trying to generate DSM and Orthomosaic images using default settings in WebODM.
The Orthomosaic image is correct by providing GCP but the DSM file is having inaccurate ...
1
vote
1
answer
2k
views
Digital elevation model - getting files in the .DEM extension
Could you tell me from where can I get the Digital Elevation Model data in the .DEM file extension?
The option for QGIS here:
https://www.qgistutorials.com/en/docs/working_with_terrain.html
shows the ...
- 4,029