Questions tagged [terrain]

The vertical and horizontal dimension of land surface

68 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
6 votes
0 answers
224 views

Using the height of river to approximate its extreme flood boundaries - terrain analysis in QGIS?

Using QGIS I'm trying to analyse an area/DEM with this criteria: - heights 10 meter above the river-centerline in both sides of river. I can do it with the calculation of contours (2m) from DEM and ...
Mohamad Reza Salehi Sadaghiani's user avatar
4 votes
0 answers
2k views

Cartopy image tiles - determining possible zoom level in advance?

In Cartopy I'm using an image tile like so: terrain_tile = cimgt.StamenTerrain() ax.add_image(tile, zoom) By default I've set the zoom level to 14 and that works perfectly for my first test case. ...
Rob's user avatar
  • 275
4 votes
0 answers
136 views

Cropping EUDEM with GDAL creates zig-zag terrain

I have downloaded EUDEM (20 Gb) from http://www.eea.europa.eu/data-and-maps/data/eu-dem#tab-original-data When I try to crop it by GDAL using: gdalwarp -dstalpha -of EHdr -crop_to_cutline -cutline ...
Matej's user avatar
  • 295
3 votes
0 answers
439 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 ...
Niklas Maier's user avatar
3 votes
0 answers
417 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 ...
swiss_knight's user avatar
  • 10.3k
3 votes
0 answers
229 views

Converting Surface Model to Elevation Model?

Is there a way to convert a digital surface model (DSM) to a digital elevation model (DEM) in QGIS? Surface models contain lots of noise (e.g. trees, buildings) when I only want to show the ground. ...
James's user avatar
  • 73
3 votes
0 answers
743 views

Using dynamic terrain in cesium?

I've been looking into tools for displaying dynamic terrain (x,y,z(t)) via the browser and I just recently came across cesium.js which looks like a wonderful tool at first glance. Many of the demos ...
ThatsRightJack's user avatar
3 votes
0 answers
1k views

High Resolution Terrain Data for the Philippines

Where can i download Philippines terrain data that is better than the 30 m ASTER global dataset?
MatthewJSlezak's user avatar
3 votes
0 answers
691 views

Is there an api for world terrain/biome data?

I'm looking for an api where I pass a lat/lng, and get "Desert" or "Mountains" or "Ocean" back. Just the general biome of the area. Most of what I've seen involves getting tiles back, so you can ...
Xlythe's user avatar
  • 39
3 votes
0 answers
3k views

Creating one DEM from multiple ASC files

I am struggling with this several days and now its time to ask how to do it in QGIS. I have very detailed 27 ASC grid files with overall size of 9 GB created from 1m contours of large area (600 m2). ...
sys49152's user avatar
  • 1,691
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 ...
Olly Roberts's user avatar
2 votes
0 answers
368 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 ...
Atul Kumar's user avatar
2 votes
0 answers
322 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 ...
Dinosaur Reporter's user avatar
2 votes
0 answers
225 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 ...
A J's user avatar
  • 47
2 votes
0 answers
21 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 ...
jzieg's user avatar
  • 21
2 votes
0 answers
141 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 ...
Andrea's user avatar
  • 21
2 votes
0 answers
248 views

Importing several LiDAR (.las) files in GRASS using v.in.lidar?

I'm building a DEM of a terrain in GRASS and have 48 LiDAR (.las) files. I know I can do this by using r.in.lidar (including the list of files as a .txt) and then r.fillnulls However, I want to ...
Juan Ossa's user avatar
  • 594
2 votes
0 answers
593 views

Raster terrain curvature analysis in QGIS

When QGIS performs a curvature analysis of the terrain raster, which curvature analysis does this represent i.e. the Gaussian curvature analysis, or Mean curvature analysis? Understanding curvature ...
marco's user avatar
  • 1,137
2 votes
0 answers
3k views

Create Terrain Ruggedness Index (TRI) in QGIS

I just started to use raster files, and I want to create a Terrain Ruggedness Index (TRI), using QGIS. Which layers must I use? Do I need to create the "Input file (DEM raster)" (in: Raster>Analysis>...
mto23's user avatar
  • 623
2 votes
0 answers
410 views

Flattening topography while retaining structures in QGIS?

I have a set of Terrain data in both DSM and DTM form. What I am trying to do is extract the features (buildings, hedges etc...) that have been removed from the DTM, but I don't want the topography. ...
Skig14's user avatar
  • 51
2 votes
0 answers
505 views

How to show a 2.5D surface of raster above terrain layer in Cesium?

I'm developing an web application that will show surfaces of rasters and terrain. These rasters are on GeoTiff format. I learned from example cesium can show image overlays earth surface. The ...
seifer_08ms's user avatar
2 votes
0 answers
128 views

texture fill doesn't display in ArcScene

My texture fill doesn't display properly in ArcScene but it does in ArcMap. What am I doing wrong? Help! ArcMap: ArcScene: The same texture fill has been selected in both ArcMap and ArcScene. Why ...
Tabitha's user avatar
  • 41
2 votes
0 answers
230 views

How to optimize color ramp for terrain

I'm working on a project to highlight LiDAR terrain on the web and part of the idea is to show the detail of the data at large scales. I've already read through the excellent Mapbox guide and I've got ...
Bryan Luman's user avatar
1 vote
0 answers
19 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 ...
Amine MB's user avatar
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:...
Beni's user avatar
  • 358
1 vote
0 answers
280 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 #...
Homayoun's user avatar
1 vote
0 answers
109 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 ...
Ike Fardy's user avatar
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 ...
lzed's user avatar
  • 11
1 vote
0 answers
182 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 ...
Flexalo's user avatar
  • 11
1 vote
0 answers
358 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 ...
Brent's user avatar
  • 11
1 vote
0 answers
136 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 ...
Jake's user avatar
  • 11
1 vote
0 answers
160 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
P Moran's user avatar
  • 111
1 vote
0 answers
655 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 ...
Naxos's user avatar
  • 11
1 vote
0 answers
56 views

Interpret terrain type from height data and/or geolocation

I have downloaded a large subset of the STRMGL1 Dataset, and have further split each entry down into 5km by 5km tiles. I now need to start classifying each tile by terrain types. Are there any ...
otoomey's user avatar
  • 111
1 vote
0 answers
376 views

Buffering based on topography in ArcGIS Desktop?

I need to do a buffer based on the real terrain. Like 500 meters from a polyline on all sides. I have DEM (SRTM) of the terrain. Is there a way to do that?
Gustavo's user avatar
  • 19
1 vote
0 answers
257 views

Smoothing relatively flat DEM for terrain and hydrologic analysis

I'm trying to do some terrain and hydrologic analysis from a 1/3 arcsecond DEM that I downloaded from the USGS National Map website. The issue I'm having is that the area in question is central ...
anjama's user avatar
  • 263
1 vote
0 answers
214 views

Generalize raster data dependent on DEM?

I'm working on a generalization process of probabilistic calculated raster data (rockfall extend, data shows probability of being hit by a rock in %; I used binary data, 1 for "one hit or more", 0 for ...
Kevin's user avatar
  • 347
1 vote
0 answers
222 views

Setting up a local terrain tile server

I am setting up an offline tile server. Does anyone know of something similar to OpenStreetMaps and/or Stamenmaps for terrain data that I can use with unfolding or other api?
mayowawa's user avatar
1 vote
0 answers
343 views

QGIS Profile tool does not plot graph

I tried to use the Terrain Profile tool, but it wont display any graph, no plot, just grey. It calculates the values in the table, but it seems some plugin is missing or not working but I have no idea ...
Oliver R.'s user avatar
1 vote
0 answers
628 views

Why do I get an error running Catchment Polygon Processing?

I am trying to run catchment polygon processing in ArcGIS 10.3, and this is what i get "error hresult e_fail has been returned from a call to a com component" Can you help me to debug this error?
Teehaysh's user avatar
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 ...
Ritesh Jung Thapa's user avatar
1 vote
0 answers
328 views

different results :Slope analysis in qgis vs ArcMap

I want to make slope analysis on geoTiff. I am using ArcMap and qgis. But i get different results, but both are in degrees. I ArcMap i recive range from 0 to 42 degrees, but i qgis it from 0 to 17 ...
komy's user avatar
  • 391
1 vote
0 answers
61 views

How is "flat" defined in SAGA

SAGA has a feature that determines flats. Does anybody know how they define a flat? If I start with a raster, each pixel is flat - so it has to be more sophisticated than that. I would like to be ...
PeterB's user avatar
  • 145
1 vote
0 answers
214 views

Checking if Terrain Model has pyramids or data sources using ArcPy/Python?

I asked this question in the ESRI forums and got nothing but a lesson on LAS point cloud classifications — not even remotely what I had asked. I’m hoping someone here can point me in the right ...
NCFMP's user avatar
  • 103
1 vote
0 answers
144 views

How to create "undulating terrain" for playground in ArcGIS?

How could I create undulating terrain in ArcGIS? I know I could create it by creating a TIN model but first I need to have "input data" - shapefile with Z (height in attribute). Is there any way I can ...
L.s.'s user avatar
  • 105
1 vote
0 answers
183 views

is there a gis web engine for displaying video on terrain?

i desire to display video on a globe surface on it's geographic position context. i prefer an opensource solution for displaying the video on map elevation model in web GIS application, but could ...
Barak Schoster's user avatar
1 vote
0 answers
39 views

GRASS GIS and Liss4MX

i am working on grass gis. how to use grass gis for liss4 of IRS-P6.I have to do atmospheric correction for hilly terrain data.i would like to use grass's i.atcorr. may i know the dependencies and how ...
user28542's user avatar
  • 320
1 vote
0 answers
85 views

What kind of methods are most commonly used to interpolate a relief?

I have got a topographic plan with height measurements which I converted to point shape file with height value in attributes. I was wondering, what kind of methods are most commonly used to ...
M_K's user avatar
  • 63
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 ...
Jonny Quest's user avatar
0 votes
0 answers
27 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 ...
Anna's user avatar
  • 1