Linked Questions
12 questions linked to/from Scale and Z factor have no effect on hillshade analysis in QGIS
1
vote
1answer
234 views
'Scale' value in slope percent map in QGIS? [duplicate]
What value should be used for scale while calculating slope percent in QGIS?
Some documents suggest is as 111120 and some as 365130.
I am using ESPG 4326 projection and do I need to convert this ...
129
votes
7answers
206k views
Algorithm for offsetting a latitude/longitude by some amount of meters
I'm looking for an algorithm which when given a latitude and longitude pair and a vector translation in meters in Cartesian coordinates (x,y) would give me a new coordinate. Sort of like a reverse ...
5
votes
1answer
3k views
Hillshade results look too grainy
I have a problem with hillshade function: I've set 315 azimuth, 45 vertical angle and 1 Z factor, but the result is very bad...
The original dem file is a .geotiff from Global Data Explorer (Aster ...
2
votes
3answers
5k views
Using .tif files to get elevation and slope in ArcMap? [closed]
I'm using ArcMap 10.3 on Windows 10 and I have the 3D analyst, ArcScan, Geo-statistical analyst, network analyst, publisher, schematics, spatial analyst and tracking analyst extensions.
I have a ...
3
votes
2answers
6k views
Getting incorrect slope values from an ASTER DEM in QGIS?
I have a DEM layer from ASTER satellite and I want to get the slope information from it.
I use terrain analysis > slope, but the output is so wrong. Why is that?
Here is the DEM:
And here is the "...
5
votes
1answer
805 views
Slope layer with false results in QGIS? [duplicate]
After the DEM creation, I wanted to create slope layer.
However, the result has not satisfied me. I don't think the slope map is correct. Have you ever encountered false calculated terrain map?
...
4
votes
1answer
964 views
Producing Hillshade in QGIS?
I have been trying to create a hillshade using DEM data, however, regardless of the scale and z values I use the output is all black.
I accessed the DEM data from a government source and clipped it ...
0
votes
2answers
153 views
Hillshade not displaying correctly in ArcGIS Pro?
I have a large DEM of England that I have clipped to my study area and have been trying to generate a hillshade from. I tried a few variations with the parameters in altitude and azimuth (leaving z =1)...
1
vote
1answer
470 views
What's the right way to calculate the scale parameter value for r.relief in GRASS?
I have a little doubt about the way I should calculate the value of the "scale" parameter in the r.relief command in GRASS.
In the description section of the r.relief page of the GRASS manual I read:
...
1
vote
0answers
235 views
Scale factor for DEM Slope in QGIS? [duplicate]
My DEM raster coordinates are in WGS84: 45.4763884,-121.5736061 and vertical units are in feet I believe. I want to do a slope analysis.
Do I need to add scale factor?
I have been seeing different ...
3
votes
1answer
103 views
Unexpected results with Raster Terrain Analysis Plugin
In QGIS 2.18.18 on Windows 10, I have downloaded the NASA file srtm_05_01.tif that is available at http://dwtkns.com/srtm. I use the Terrain Analysis Slope method on that file with the following ...
1
vote
1answer
56 views
Creating slope map with ArcGIS Desktop?
I created slope map with DEM model in ArcGIS Desktop. But it is only categorize in to two sections. I think it is problem with the horizontal and vertical scale. I used WGS84 coordinate system.
How ...