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Questions tagged [terrain]

The vertical and horizontal dimension of land surface

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1 answer
21 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 ...
0 votes
0 answers
18 views

Choose DEM layer as terrain in 3D view using PyQGIS

I saw that many 3D classes and methods have been exposed to PyQGIS so I was wondering if choosing a raster layer as a terrain was now possible. I'm working on QGIS version 3.36.1. This is the GUI ...
1 vote
1 answer
51 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 ...
0 votes
1 answer
193 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,...
1 vote
0 answers
30 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 ...
0 votes
1 answer
392 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. ...
3 votes
2 answers
773 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 ...
1 vote
0 answers
60 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:...
4 votes
3 answers
6k views

QGIS Profile Tool shows no profile

I have installed and followed the process to produce an elevation profile from the Route Profile plug-in in QGIS, but for some reason I am getting no profile to appear. The grids are from OS ...
1 vote
1 answer
87 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
36 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 ...
3 votes
2 answers
339 views

Creating topographic "layer cake" map a.k.a. Tanaka contour in QGIS

I'm wondering if there is any way to create a map similar to the image below. Basically, it would be the contours extruded, add a singleband pseudocolor ramp as the color on top, and be able to ...
1 vote
0 answers
325 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 #...
7 votes
4 answers
797 views

Which ArcGIS product gives full 3D terrain navigation and (flight) simulation?

I looked at the ArcGIS ESRI website and find that 100% of the screenshots depicts a 2D map with at most relief shading. Is there any product ArcGIS or not that gives real 3D terrain visualisation ...
0 votes
0 answers
30 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 ...
0 votes
0 answers
134 views

How to perform terrain correction in Google Earth Engine

How can I perform the terrain correction as the shadows from the mountains severely affect the land use classification results. The random forest model picks the shadows as the water bodies. Here is ...
30 votes
6 answers
16k views

Calculating terrain Curvature in QGIS

I have an elevation raster and I would like to get some basic terrain variables, such as slope, ruggedness, aspect or curvature. The problem is that I don't seem to have the possibility to calculate ...
2 votes
2 answers
2k views

Terrain creation error using a GeoTIFF file with HEC-RAS 6.2 - "object reference not set to instance of object"

I am attempting to import a TIFF file created in QGIS, into HEC-RAS. I have a projection file as the SRS definition for HEC-RAS, which is derived from a shapefile that lines up with the spatial extent ...
2 votes
1 answer
170 views

Why doesn't a 1-pixel buffer around the edges of Mapbox's Terrain-RGB tiles show up?

I am reading the documentation of Mapbox's Terrain-RGB tiles. It says: Buffered tiles. Each map tile includes a 1-pixel buffer around the edges to enable tile interpolation in uses cases like terrain ...
1 vote
2 answers
2k views

Merging several .hgt files into one

I'm currently struggling on trying to combine several .hgt files with different software. I can get the 4 tiles into any kind of software but my issue is exporting the file back to .hgt file. I've ...
1 vote
1 answer
45 views

XYZ points for terrain models in different resolutions from a PostGIS server

I have a grid of points in a PostGIS DB. This grid is in the resolution 1m and its around 100.000 Points large. Getting these points from the db works for me. For example like this: SELECT * FROM ...
0 votes
0 answers
42 views

Units of slope output

I am calculating the slope from the DGM file which is of 1m spatial resolution. The default CRS is ETRS89 33N 25833 for that particular piece of land in Germany, kustriner vorland. In what units are ...
2 votes
1 answer
161 views

Correspondence of 0m elevation height of a digital elevation model (Copernicus DEM) to mean sea level

I want to model future coastal flooding caused by sea-level rise under the latest IPCC scenarios at global scale. To this end, I use the Copernicus Digital Elevation Model (Copernicus DEM: https://...
30 votes
8 answers
8k views

Generating random but believable digital elevation model?

Is there a way to generate a DEM, programatically or otherwise, that will feed into ArcGIS Desktop for further spatial analysis? Perhaps this needs to be broken down into smaller incremental steps: ...
1 vote
0 answers
113 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 ...
0 votes
0 answers
55 views

Most detailed surface map that can be produced from LiDAR data in ArcMap

I want to find old military trenches or at least to get an idea where they were, so that I can go to those areas and survey them. I know the basic method of conversion from .lasd to elevation raster ...
-1 votes
2 answers
448 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 ...
3 votes
5 answers
9k views

Can I convert ESRI Grid (DEM) raster to USGS DEM?

There is a tool for DEM to Raster in ArcGIS but I need to convert my ArcGIS DEM rasters (mostly LiDAR) into USGS DEM. The idea is to import this DEM into Sketchup and create a "sandbox" TIN surface ...
1 vote
1 answer
225 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 ...
2 votes
0 answers
29 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 ...
1 vote
0 answers
1k views

using openlayers 3 and three.js to use openlayers 3 map as texture

I am trying to use Openlayers 3 along with three.js to use openlayers output map as texture. I found that openlayers 3 is webgl based and so is three.js. So they must be compatible. What I have done ...
1 vote
0 answers
50 views

QGIS: Average of digital terrain model for a certain polygon

In one layer I have a lot of different polygons, which represent different areas. In addition I have downloaded a digital terrain model, which shows different slope percentages. All of this works, but ...
1 vote
2 answers
1k views

ee.Terrain.slope() output at wrong resolution after DEM mosaicking [closed]

I'm using the Google Earth Engine JavaScript API 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 elevation ...
10 votes
6 answers
2k views

seeking "Available Sky" implementations

I'm looking for implementations of an algorithm called "Available Sky". ArcGIS (Spatial Analyst or GRID) is preferred, but solutions in GDAL, SAGA GIS or others are perfectly acceptable. The ...
1 vote
1 answer
1k views

What is the difference between TIN vs MESH vs TERRAIN in the context of GIS?

I couldn't seem to fully understand the differences between TIN, MESH, and TERRAIN dataset formats in GIS. Per Wikipedia a triangulated irregular network (TIN)1 is a representation of a continuous ...
0 votes
1 answer
603 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 ...
0 votes
0 answers
42 views

How to determine the area size of a terrain for which I want to calculate its roughness

I want to calculate the wind speed on the ground for a specific location. In order to do so I will use the log wind profile. One of the input variables of this formula is the surface/terrain roughness....
13 votes
2 answers
4k views

Choosing TRI, TPI, or Roughness [closed]

I am working on a site selection projection where I will be unable to perform any in situ observations. A key component of the selection process is the ruggedness of the underlying terrain. I plan on ...
0 votes
0 answers
20 views

Band used for deformation estimation using In-SAR

Which polarization of SAR data (C-band - Sentinel-1A) shall I use to get a better deformation map of a mountain terrain - VV or HH?
4 votes
2 answers
4k views

Giving 2d contours Z-height from attribute table in QGIS

I have a contour data file downloaded from UK Ordnance Survey, which gives 2d contours of an area in gml format (also supplied in .shp format) with the heights of each contour attached to the ...
5 votes
1 answer
3k views

Creating contours from smoothed DEM instead of using Terrain to Raster

I am using ArcMap 10.1. I'm fairly new to working with lidar and have been assigned the task of creating 2ft contours for the entire county using USGS-provided lidar tiles. Is there a significant ...
1 vote
0 answers
185 views

Calculate slope along line feature for line segments of equal elevation?

I would like to calculate the surface slope of a glacier in the Swiss alps. In ArcGIS Pro this can be done using the Add Surface Information Tool. The output is a data table with the slope for each ...
9 votes
3 answers
38k views

Creating profile cross-sections in ArcGIS Desktop 10.x? [closed]

Because the default 'Profile Graph' tool was not sufficient, I wrote a custom VBA script that creates scaled and exaggerated profile cross-sections in ArcGIS but I need more features: Visualize more ...
2 votes
1 answer
989 views

Using Watershed Basin from SAGA in QGIS

I have a weird phenomenon going on in QGIS. I want to derive a channel network and also the catchment areas using "watershed basin" from SAGA. In the end I want to have the flow direction ...
1 vote
1 answer
520 views

Error calculating aspect from DEM in R using raster/terra

I have a DEM file gathered using R. The raster and terra packages both have a function to calculate aspect, called terrain(). When using the terrain() function and the units="degrees" ...
6 votes
2 answers
582 views

Auto Balancing in EarthWork

During earthwork development, earth terrain has to be cut ( if the terrain is higher than platform) or fill ( if the terrain is lower than platform) in order for the construction of platforms such as ...
1 vote
2 answers
667 views

Converting aspect/direction raster from geographic degrees to arithmetic radians

I have a raster/grid representing e.g. terrain aspect or flow direction, coded in geographic degrees (0-360°, clockwise from the north). I would like to convert it in arithmetic radians (0-2π, ...
1 vote
1 answer
814 views

Creating TIFF from Contour Lines

I need to quickly create a TIFF terrain (shades of grey terrain) from contour lines, or rather to create a GeoTIFF. In the past, I extracted vertexes from the contour lines and used that to create new ...
2 votes
0 answers
227 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 ...
2 votes
0 answers
380 views

Generate GLTF/OBJ models from quantized mesh (terrain) in CesiumJS?

I’m exploring ways to generate gltf / obj models from terrain mesh. My goal is to show 3d cut-fill volume calculation, something like the following - I realized that I don’t need to DEM to generate ...

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