All Questions
12 questions
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
1
vote
0
answers
207
views
How to calculate exact slope and aspect for a polygon
I want to calculate the aspect and slope for polygons, because they appear as fruit-growing areas.
I got the DEM 1m for my datas and calculated aspect and slope with the QGIS functions. Then I ...
- 11
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
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
1
vote
1
answer
62
views
Define point locations in relation to slope [closed]
I have a dataset of settlements that I would like to put in relation with slope and aspect layers that I have made to see if there is a preferred altitude or direction (facing north or south, etc.) ...
- 89
2
votes
1
answer
220
views
QGIS Raster Mask Layer?
I have a raster slope layer and a raster aspect layer. The slope layer is single band grey, that is black to white, with white as the steepest slope. The aspect layer is pseudo colour.
I'd like to ...
- 163
4
votes
1
answer
1k
views
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
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
4
votes
1
answer
2k
views
Conditional Statement (CASE-WHEN) in QGIS for slope aspect
After processing a DEM with a mask to get the aspect values of some polygons I would like to create a new field classifying those values as N, NE, E, SE, S, SW, W, NW.
I've written this but I can't ...
- 333
1
vote
1
answer
2k
views
Methods in Slope, Aspect SAGA calculations
Using this algorithm in QGIS I can choose between 7 methods, the default one being by Zevenbergen & Thorne 1987. What's the difference between them and can I just use the default one without ...
- 229
8
votes
1
answer
4k
views
Rotating symbols per attribute value in QGIS?
I am trying to apply a rule to rotate symbols based on the value of an attribute.
I tried to copy Automatically changing the angle of a symbol in QGIS?, which is essentially my question, however it ...
- 848
3
votes
1
answer
275
views
Information about algorithm used by Terrain models
I have calculated slope and aspect using the DEM (Terrain models) GUI in QGIS Essen. I was also able to calculate the profile and tangential curvature using the toolbox r.slope.aspect. I was wondering ...
- 53