Questions tagged [terrain]

The vertical and horizontal dimension of land surface

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28 views

How to interpret Terrain Ruggedness Index according to Wilson et al. (2007)?

Is there a categorical scale used to interpret values from the Terrain Ruggedness Index as calculated by Wilson et al. (2007), which is used in the raster library in R?
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27 views

Interpreting Ruggedness Index calculated from SRTM Tiles

I am looking for help interpreting the values from Ruggedness Index calculations. I downloaded SRTM tiles using the SRTM Downloader plugin in QGIS. Then I calculated ruggedness from SRTM tiles in QGIS ...
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32 views

Is there some way to get "smooth" terrain in MapBox GL JS?

I have successfully added "terrain" to my little MapBox GL JS world, but it looks strange to say the least. I understand that it cannot have data for every little atom (or even square ...
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22 views

QGIS Profile Tool shows no profile on outdise layer

I'm trying to produce a terrain profile\cross sections using QGIS Profile Tool. The tool is working fine with sample line\selected layer inside the terrain border (picture 1). However, when the sample ...
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27 views

How to extract source headers from gdal WMS driver?

I am using gdal.Warp and Mapzen Terrain Tiles in Python to generate arbitrary digital elevation models. I see in the Terrain Tiles Documentation that the Mapzen Terrain Tiles service will return a ...
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1answer
90 views

Intersection of an arbitrarily oriented 3D plane with a terrain DEM

In a nutshell I'd like to compute the intersection of a 3D plane (defined by 3 points) and a terrain (given as a raster DEM GeoTIFF), and more particularly the part between two lines of that plane. ...
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16 views

A way to add Terrain type coefficient (as a raster) in functions of movecost package R?

Im using movecost R package, it allows to add changes in Terrain Type factor as a coefficient (N). I need this to vary between the several terrain types in my study area. So, can N be a raster with a ...
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48 views

Calculating direct solar radiation using QGIS and GRASS

I am using QGIS 3.16.8 and GRASS 7.8.5. I would like to compare two places in my study area climatically. Since both are only a few 100 metres away, I assume that they only differed in terms of slope ...
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1answer
38 views

Reproducing terrain ruggedness index from the original paper example [closed]

I am not able to reproduce the terrain ruggedness index for the example used in the original Riley et. al paper. The example is as follows: When I try to reproduce the numbers in MS Excel I get ...
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26 views

Stripes in slope raster calculated from aster-dem in QGIS

I calculated a slope map from Europe based on the aster-DEM with raster->analysis->slope (gdaldem) in QGIS. But this results in vertical stripes throughout the map. I thought that this might be ...
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1answer
36 views

How to calculate the terrain profile in Profile Tools plugin

Now, I'm trying to calculate terrain slope(°) using pyqgis using below process. Along the specific lines which I want to know the terrain profile, I generated the points using 'qgis:pointsalonglines'....
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40 views

An error occurred when using the terrain function in the production of Shiny dashboard

I am new to the 'shiny' package. I just try to produce an aspect map from the existing DEM data using the Shiny dashboard for training purposes. However, I faced the below warning in R and error in ...
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33 views

Grid from SAGA natural neighbor results in black grid

I'm new in QGIS and I'm following tutorials mainly on YouTube so I created a path in Google Earth then exported to kml which is converted to txt via GPS visualizer. When added delimited layer it shows ...
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1answer
93 views

Why do I get negative values for the topographic position index (TPI)?

I run into issues, when trying to calculate the topographic position index (TPI). I get values ranging from -13 to 17. And the resulting layer looks a bit odd, too: If I understand it correctly, this ...
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22 views

Swath profile plugin

im trying to install the toolbox Swath profile, but the program send me an error "NameError: name 'Line_shapefile' is not defined". How can i install it?
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34 views

Building terrian data in ArcGIS Server for Cesium

I want to use ArcGIS terrain Data in Cesium. I don't know how to build terrain data in ArcGIS Server 10.3.1 according to specifications of Cesium. Is there a tutorial or sample data which can be used ...
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1answer
35 views

Free or FOSS Elevation API for Heightmaps (image files) instead of elevation points

I'm coming from a Blender background, in which simple FOSS extensions exist (like BlenderGIS) that download SRTM/Aster Elevation Data and make a terrain based on this. I'd like to make something ...
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1answer
23 views

How to get elevation raster data at custom scales for a specific region?

I'm new to GIS and trying to obtain elevation data for a specific region, transformed to raster data with a custom cell size of 10 meters. My first attempt was to download a TBDEM dataset from USGS ...
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54 views

How do I overlay vector data over a 3D terrain basemap?

I would like to create a map that is similar to the one found here: https://www.reddit.com/r/MapPorn/comments/lpo557/geological_map_of_north_america/ . I'm thinking that you could replicate this with ...
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1answer
39 views

r.slope.aspect grass gis datum format on dx and dy analysis

I'm performing terrain analysis due to photovoltaic installation on QGIS with r.slope.aspect plugin. I'm interested in evaluate differently N-S slope and E-W slope based on the PV system I would ...
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26 views

Accessing Terrain Tiles using podpac - broadcast error

I am working through the examples from the podpac site. I have stated with the most basic example for using terrain tiles given here: https://github.com/creare-com/podpac-examples/blob/main/notebooks/...
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1answer
226 views

Terrain Ruggedness Index (TRI) calculated in QGIS is approx 4 times that calculated in GDAL

When I calculate TRI using QGIS and GDAL tools for the same elevation DEM, I get results that are comparable between the two except that the absolute values in QGIS are approximately 4x that in GDAL. ...
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1answer
26 views

Selecting Terrain Dataset by elevation in ArcGIS Pro

I have added the Terrain Dataset to my project in ArcGIS Pro. I would like to select the areas which have an elevation above some threshold. Eventually, I want to use this selection as a clipping mask ...
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131 views

NA values as result from Grass functions (r.slope.aspect, r.sim.water) in R

As the result from r.slope.aspect I get a raster with only NA values. r.param.scale works, but doesnt generate dx and dy maps, which I both need for r.sim.water function. Code snippet 1 (initialize ...
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92 views

Using Aspect tool in QGIS

For my bachelor thesis in biology I´m working with QGIS 3.14 (Pi) and tried to create a layer where the slope aspect/expositon/exposure is presented. I´ve got a DTM1 on hands. There is this function ...
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3answers
101 views

Terrain aspect similarity

I have a point data set with terrain aspect at the location of the points, measured in degrees. I want to compute the similarity of aspect between the points, e.g. 70° is similar to 90°. This is ...
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17 views

Lidar Dataset for Toe and Crest Detection

I have read a paper on Terrain Toe and Crest Feature Detection and Labelling forAutonomous Mining and started working on building the code for this. But I am unable to find the dataset used in the ...
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0answers
84 views

Extract terrain coordinates as seen from a viewpoint + FoV in a digital globe

Context Every one working with photogrammetry or 3D knows what a depth image is. For example OpenCV defines a "depth map" from a stereo pair, e.g.: where the darker a pixel is, the greater ...
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1answer
379 views

How do you export a 3d-model in QGIS to a file that can be read in Rhino?

I am really new to QGIS and haven't really gotten familiar with all the functions yet. I've made a 3D map/model in QGIS, and would like to export this in a file format so that I can use it as a ...
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1answer
274 views

Earth engine - ee.Terrain.slope() output at wrong resolution after DEM mosaicking

The big picture: I'm using Google Earth Engine (Javascript) to do a terrain correction on Sentinel-1 imagery, as in Andreas Vollrath's work. However, I want to use a higher-resolution Canadian digital ...
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0answers
17 views

Using ArcMap to build a Terrain DEM that looks exactly the same as a TIN built from the same point shapefile

I am attempting to replicate DEMs previously constructed as TINs in the Terrain format. Building a Terrain and a TIN out of the same point shapefile produces two maps that look extremely similar, but ...
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1answer
502 views

Getting from a USGS historical topographic map to a Unity terrain heightmap

Is it possible to start from a USGS historical topographic map and get to a Unity terrain heightmap? To see an example of the kind of historical topo map I am talking about: Go to: https://ngmdb....
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38 views

Define Terrain/Elevation textfile data format

I have a program that can visualize terrain/elevation data but will only recognize files in the below format. It has the extension .map but it is not recognized by QGIS or GDAL so I believe it may be ...
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50 views

How do I "flood" a terrain in Cesium to represent a high water level

I am thinking about using a plane object to represent a water level by rendering it as a certain height above ground using Cesium. Is there any example code that
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1answer
321 views

Creating contour lines from DTM in PostGIS

Is there any possibility to compute contour lines from a raster DTM directly in PostGIS on a PostgreSQL database? I have only found this solution based on points "Fast contour lines using plain ...
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1answer
306 views

What is meaning of scale on x and y axis of image using matplotlib

I am finding elevation of a region using richdem. Can somebody tell me what is the meaning of the scale which is on the x and y axis of the image? import os import numpy as np import matplotlib ...
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94 views

DSM results from WebODM are not correct [closed]

I am new to WebODM and I am trying to generate DSM and Orthomosaic images using default settings in WebODM. The Orthomosaic image is correct by providing GCP but the DSM file is having inaccurate ...
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1answer
406 views

Digital elevation model - getting files in the .DEM extension

Could you tell me from where can I get the Digital Elevation Model data in the .DEM file extension? The option for QGIS here: https://www.qgistutorials.com/en/docs/working_with_terrain.html shows the ...
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1answer
176 views

How accurate are Ordnance Survey MasterMap topography spot heights?

The spot heights in the Ordnance Survey MasterMap sample data over Exeter with feature code 15404 are presented as an integer value in metres. But how accurate are these spot heights? I had assumed ...
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34 views

Problem with weird values in DTM and not showing correct elevation

I am still new to Gis and don't know if I understand what is wrong. I am working in a ocean survey program with point clouds. As seen on the picture the minimum depth is 1,92 and maximum 12,02. I ...
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310 views

Point/Area location of data in reference to geotransform of raster

I'm trying to understand how to interpret the position of pixel data within a GDAL raster, specifically as it applies to files containing height data. I'm create Triangular Regular Network (TRN) for ...
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1answer
52 views

ArcGIS 10.X - DEM raster creation - Point to Raster vs. Terrain to Raster tools [closed]

I have a bunch of LiDAR data that I need to make a raster DEM & DSM from. From what I can gather my options are use the Point to Raster tool directly on the Multipoint feature or make a terrain ...
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2answers
1k views

Profile tool and GPS data in QGIS

I am trying to get elevation graph with the Terrain profile tool on my GPS data and can't get it to work. I have GPX file from a drive. I got this imported in QGIS. I have elevation data for each ...
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1answer
512 views

Cutting/ exporting multiple terrain profiles to CSV files with QGIS?

I am trying to cut multiple terrain profiles and export them to CSVs (individual or combined). I have a shapefile of the profile lines, and a DEM to cut the profiles from. I can do this manually ...
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1answer
960 views

My 3D polygons are being drawn below terrain

I'm importing a JSON file with polygons but I can't put them at the terrain ground level. They insist to be below the terrain. I've created my own terrain server using DEM SRTM and the docker tumgis/...
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1answer
382 views

Creating 3D image from HGT files?

Is there any command line tool to create a 3D terrain from a DEM SRTM HGT file like this? I mean, given a camera position, a HGT file and a satelite image. EDIT 1 First try to adapt mdsumner's ...
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0answers
91 views

VRM tool QGIS error generating layer

I am trying to use the VRM tool in QGIS of the SAGA package. Every time I get an error message: layers could not be generated. I tried different input rasters (DEM and DTM) and kept other settings ...
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1answer
101 views

Aligning shapes to terrain in CityEngine?

I have a problem. As soon as I click "Align shapes to Terrain", my shapefile rectifies and falls down the edge. In the first picture(Border_Issue1) you can see that all shapefiles have the right size,...
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1answer
63 views

Integrating sea level curve data in a bathymetric grid

I am attempting to apply these data recording where sea-level was in the Gulf of Mexico (in meters below mean sea level) over the past 20,000 calendar years at a 500-year resolution in ArcMap: What ...
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1answer
244 views

r.surf.area command of GRASS GIS is giving a very small area

I am a beginner to GIS systems and am trying to calculate the surface area of a dem using r.surf.area command of GRASS GIS. The surface area it is giving me is unacceptable as it is very small. It is ...

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