All Questions
11 questions
4
votes
1
answer
1k
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Obtaining slope and aspect for points in QGIS
I'm new to QGIS.
I have GPS points uploaded to QGIS and a ⅓ arc-second DEM (USGS) of the area. I'd like to generate slope and aspect data for each point.
What is the best way to do this?
The ...
- 305
4
votes
1
answer
983
views
Using SRTM Global DEM for Aspect calculation?
I need to derive a raster representing aspect for North America (from STRM data, originally in geographic lat/long). In most projections, true north is only map north along eg the central meridian so ...
- 43
4
votes
0
answers
2k
views
Calculating slope and aspect from DTM lidar elevation data in ArcGIS Desktop? [closed]
I have an ASCII 2m lidar DTM file which I converted into a raster in ArcGIS with the From ASCII to Raster tool. From this DTM file I would like to calculate the slope and aspect. I have used the ...
- 49
1
vote
1
answer
163
views
What is SOA (slope of aspect)?
I’m reading an article that the authors talk about extracting values of SOA (slope of aspect). I can’t find anything related to that on Google.
This article reference is : ZHOU, Yi et al. Automatic ...
- 691
1
vote
1
answer
3k
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Selecting south-facing slopes with slope > 10° using ArcGIS Desktop?
I have to make a Model in the Model Builder which will select the areas with slope bigger than 10° and which are facing to the south. It should be used for environmentalist who will just insert a DEM ...
- 373
1
vote
0
answers
231
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
1
vote
0
answers
32
views
Using WCS DEM data for make slope and aspect maps in QGIS [duplicate]
I need to do several slope and aspect analyses (hundreds).
Instead of downloading an ASCII for each location, I want to extract/clip the elevation data from wcs and do the analysis.
This is the WCS ...
- 41
0
votes
1
answer
49
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 ...
- 745
0
votes
1
answer
209
views
Correct measure unity for slope and aspect in order to work in QGIS with "r.sun.insoltime"
I'm using QGIS 3.10 and I should create a raster that shows the hours of sunlight referring to a given day for my province. r.sun.insoltime (Fig. 1, sorry it's in Italian but I traslate) to work asks ...
- 23
0
votes
1
answer
1k
views
Merging slope angle and aspect rasters
I have created slope and aspect from a DEM layer, I reclassed both slope and aspect into categories (for example slope is now a value of 1-6) and turned them into polygon layers where each polygon has ...
- 27
0
votes
0
answers
218
views
Extracting slope of aspect information using QGIS?
In What is SOA (slope of aspect)? @Spacedman explained to me what SOA means. Now I need help to understand how I could work with it and extract the data that I want.
I want to use Qgis (with Grass ...
- 691