All Questions
108
questions
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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
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
0
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answers
54
views
Using DEFRA LiDAR dtm-1m to calculate slopes etc in QGIS
I have a shapefile of woodland polygons and want to calulate slope and slope orientation of the polygons.
I am using the LiDAR Composite Digital Terrain Model (DTM) - 1m in QGIS. Available at: https://...
- 41
0
votes
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answers
101
views
QGIS Slope: Slope processing tools not working as expected using DEM
I have a NRCS 2M DEM Bare Earth file for which I have already successfully applied the Hillshade and Aspect tools in my QGIS v3.34.1 project (see below).
Now I am attempting to determine slope using ...
- 31
0
votes
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160
views
How to interpret values of elevation standard deviation statistic (and not elevation mean) from DEM
I am trying to interpret the standard deviation of elevation to understand the topographic landform of my study area.
We have 2km*2km grids in the study area for which we extracted certain landscape ...
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
0
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63
views
QGIS how to export slope data with x, y
I have a shapefile with contour line data, that looks like the following:
Columns 1, 2, 4, and 5 are geometric data and column 3 is contour data. (MultiLineString type)
First, I tried 'TNI ...
- 41
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
0
votes
1
answer
119
views
Determining slope percentage using ArcMap
I am working on a project where I need to conduct a MCA. One of the criteria is: if the slopes are greater than 15%, they should not be used at all. I have DEM model and a slope has been made in ...
1
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0
answers
103
views
DEM to Slope in QGIS 3 [closed]
I'm having trouble with the slope of this particular DEM (USGS_13_n33w097_20211124). The file downloads correctly and presents the elevation values in QGIS, however after running the QGIS Slope tool, ...
- 77
1
vote
0
answers
62
views
Slope Angle between vertices using QGIS
I am trying to work out whether a center pivot irrigator (you may have to google this to see what they look like) has too much angle between the spans as it goes over hilly terrain.
I can generate ...
- 49
0
votes
1
answer
150
views
Accuracy of LIDAR from XYZ and DEM comparison
I'm taking point cloud xyz's from LIDAR and turning them into DEMs, then comparing that DEM, to a DEM of the original 3D CAD Models to see how well the LIDAR is measuring the model for elevation and ...
- 1
0
votes
0
answers
88
views
Creating slope map from DEM of Lunar South Pole
I've managed to create slope maps from other DEM's without much issue, but this DEM seems to have trouble and only does the very top section, with the rest being an error.
I am very much a beginner in ...
- 1
4
votes
1
answer
210
views
Number of pixels Elevation - Aspect - Slope
I have a DEM, resampled at 100 x 100 and clip by mask with a polygon.
Unique values report give me Total pixel count: 733810 with NODATA pixel count: 427098.
Aspect and Slope map give me the same ...
- 174
1
vote
1
answer
114
views
Calculating terrain attributes before or after upscaling DEM
This is more of a theory question. I am working on a project that requires the use of topography data, I have a 1KM resolution global DEM to which I will be using GDAL to calculate general topography ...
- 11