Questions tagged [terrain]
The vertical and horizontal dimension of land surface
245 questions
0 votes
1 answer
63 views
r.horizon in GRASS GIS computes the maximum horizon angle: how to calculate HEIGHT or DISTANCE to this horizon point
The GRASS GIS r.horizon angle computes the maximum angle to the horizon within a specified search radius. I have used this to produce raster maps of horizon angle from a DEM of mountainous terrain ...
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3 votes
1 answer
144 views
Creating 3D terrain from 30m DEM using Python
I'm trying to create a 3D terrain surface from a DEM (GeoTIFF) file using Python, in order to visualize clustering results of observation points on top of it. I successfully extracted the elevation ...
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0 votes
0 answers
59 views
Issue on visualizing Custom Terrain(.terrain) from DEM(.tif) in Cesium
I have one DEM(.tif) file having a 12.5-meter ground resolution with EPSG:4326 projections. After converting this DEM to a terrain format (which includes a layer.json file with 0 to 15 folders and ....
1 vote
0 answers
55 views
How to use ArcGIS Terrain Ruggedness Index raster function
I have a DEM raster in ArcGIS and I want to use the Terrain Ruggedness Index (TRI) raster function on it. I open the TRI raster function using the Living Atlas in the catalog pane. I then open the ...
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0 votes
0 answers
81 views
QGIS flight-isochrones in mountainous terrain
I want to visualize the flight-path of a helicopter in the Austrian alps with isochrones. As a helicopter needs a lot more time flying around mountains in a valley than it would above flat ground I ...
0 votes
1 answer
79 views
What's the difference between slope baseline and slope neighborhood distance?
When I think of slope baseline, I think of the definition as "the distance over which the slope is calculated." So, for example, if you have a 5 m/pixel DEM, you can create a 10 m baseline ...
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0 votes
1 answer
72 views
Slope and Aspect layers masked when using ee.Terrain
I am trying to create a slope and aspect layer using mosaicked 1m and 2m LiDAR scans. The DEM appears fine but the slope and aspect layer are masked. I've put my code below. I'm quite new to GEE. The ...
0 votes
1 answer
591 views
Serving Terrain RGB tiles from XYZ / GeoTIFF files
I am trying to find a way to serve Terrain RGB tiles like these: https://blog.mapbox.com/global-elevation-data-6689f1d0ba65 from a local server for a very large area. My source files are GeoTIFF files ...
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1 vote
1 answer
273 views
LiDAR DTM slope slope analysis with a twist. Calculate elevation changes of at least 10 feet within horizontal distance of 25 feet
I have raster DTM image of LiDAR data, mapped to Washington state plane north (US survey feet), where each pixel represents an elevation value in feet. Generating a "slope map" which shows ...
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1 vote
0 answers
493 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 ...
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1 vote
0 answers
112 views
Calculate terrain attributes for a large, tiled DEM
Input: A large DEM as tiled GeoTIFFs (initially 1'665 tiles, each 500 by 500px, later possibly more). Goal: To calculate some terrain attributes such as the TPI, waterflows. Approach for smaller areas:...
- 406
1 vote
1 answer
183 views
Making world map with terrain colours in QGIS
In QGIS I would like to create a world map that has terrain colours (e.g., deserts or vegetation), as in the attached map (Gehring et al. 2022), particularly for the African continent. How should I ...
0 votes
0 answers
101 views
Some iterative way to compute heading and GPS projection at the same time?
I have the following situation: An off-road machine has a GPS antenna that is not at the center of the rear axle (this point is my path-tracking-control point). Let's say it's 3 meters from the rear ...
1 vote
0 answers
872 views
Converting GeoTIFF Elevation Data to 3D ZXY Tiles
I have a GeoTIFF file which includes elevation data. I visualized the TIFF by pyplot: from osgeo import gdal import matplotlib.pyplot as plt import numpy as np from mpl_toolkits.mplot3d import Axes3D #...
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1 vote
0 answers
122 views
Creating 3D surface / terrain in ArcGIS Pro WITHOUT 3D extensions?
I understand GIS principles, but I am a new user to ArcGIS Pro. I am currently looking to create a terrain type model / surface in 3D, using a georeferenced .ASC file containing ground heights. Is ...
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