All Questions
213
questions
0
votes
1
answer
45
views
Raising/lowering extracted contour layer using QGIS
Is there a way to raise/lower an extracted contour layer?
I've scoured the properties panel and have tried to raise/lower "elevation" menu, but when I make changes there nothing happens to ...
- 11
0
votes
1
answer
159
views
GRASS r.horizon returns nonsense
I am trying to calculate the horizon profile from a point on a mountainside, through the appropriate DTM elevation file and the GRASS function r.horizon.height (via QGIS).
However, the output looks ...
0
votes
1
answer
154
views
When loading a DEM in Google Earth Engine, it doesn't load the full map extend
I want to download a digital elevation model for a major part of Europe.
Last time I tried it with the "NASA NASADEM Digital Elevation 30m", wich can be found here: https://developers.google....
- 29
2
votes
0
answers
58
views
Getting distance between DEM's zero elevation and earth's center [closed]
I'm using the DHM25 DEM available here:
https://www.swisstopo.admin.ch/en/geodata/height/dhm25.html
EPSG:21781+5728
(Swiss CH1903 / LV03 + LN02 height)
I need to use the earth's radius under ...
- 129
0
votes
0
answers
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
36
views
Colour interpretation on ASTER GDEM files
I'm trying to understand the data in both the grayscale and colorized versions of the GDEM samples provided here: https://asterweb.jpl.nasa.gov/gdem.asp
I haven't found (looked hard enough) a ...
0
votes
2
answers
307
views
Trying to get topography via elevation package Python
So I'm trying to get some topography. In Detail some parts of the panama canal. I tried using the elevation python package. Here is my code so far:
import elevation
min_lat, max_lat = 8.0, 9.5
...
- 1
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
404
views
Which online APIs return elevation data without the height of trees and buildings?
I work on applications that generate topographic maps and analyze GPS tracks. My main concern is the presence of "bumps" due to the height of trees and buildings returned by the elevation ...
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
1
answer
203
views
Negative elevation results from USGS 1 meter DEM [closed]
The USGS 1 meter Digital Elevation Model will return negative elevations. The elevations are based off NAVD88. The negative elevations appear to be near/over water along coastal areas. This DEM is ...
- 1
1
vote
0
answers
122
views
Lower or smoothen elevation data/DEM [closed]
I have a linear.shp that represent a road about 20m in width. It is going across tall mountains and steep hills (don't worry about the logic on how a road is going over a mountain).
I need to (change, ...
- 113
-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
3
votes
1
answer
2k
views
Elevation from TIFF file
I am new to QGIS. I have an Excel file with latitude & longitude points and a GeoTIFF (.tif) file. Now I want to get the elevation of all latitude & longitude points in the Excel file. How to ...
- 33
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