Questions tagged [terrain]

The vertical and horizontal dimension of land surface

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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: ...
Michael Markieta's user avatar
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 ...
Damien's user avatar
  • 411
28 votes
7 answers
12k views

Are there open access terrain tiles with a permissive license like OSM?

Are there open access terrain pyramidal map tiles with a permissive usage license like OpenStreetMap's? I'm building aviation-related maps with Polymaps and need a good raster basemap. The Google ...
Nelson's user avatar
  • 1,320
24 votes
5 answers
9k views

Given a terrain, how to draw the stream flow path?

Assuming I have a terrain, as usual the terrain has ridges, creeks and all the characteristics that you can find on a real life map. Water flows from the top of the mountain into lower area, the path ...
Graviton's user avatar
  • 928
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 ...
Jay Laura's user avatar
  • 4,463
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 ...
matt wilkie's user avatar
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9 votes
1 answer
168 views

How to style rocky coast?

I've got a bunch of data from LINZ which includes rocky areas. Is it possible to style them as they do (see picture)? It's a fairly standard style in large scale maps so I hoped it would be simple! I'...
OAH's user avatar
  • 91
9 votes
2 answers
4k views

Generating floodplain generation given river section polylines, flood level elevation points and DEM of land surface? [closed]

I am looking to generate flood plain polygons to represent 20 and 100 year flood zones, in the most accurate and efficient way possible, given the following datasets: River cross section polylines ...
Brent Edwards's user avatar
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 ...
Jakub Sisak GeoGraphics's user avatar
8 votes
3 answers
2k views

Where I can find world terrain data?

I need free terrain data for the whole world which I can import into TileMill. Is there some source where I can download them?
againstflow's user avatar
  • 5,034
8 votes
2 answers
10k views

How to create a crisp topographical/terrain map with ggplot2?

I am trying to produce a high quality vector based map (in greyshades) in order to report locations. I tried this by getting maps from GADM and SRTM to make a raster as a base for plotting in ...
Tony's user avatar
  • 81
8 votes
2 answers
5k views

Bringing GIS data into Minecraft

A little off the beaten path...: Denmark has built a 1m:1block Minecraft World using real GIS data. Here's the home page, in Danish: http://gst.dk/emner/frie-data/minecraft/, and an ArsTechnica ...
matt wilkie's user avatar
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7 votes
2 answers
3k views

Slope, in which direction?

I have a dilemma? I work with a slope terrain. Slope field is done by a percentage of 10%. My question is, in which direction is oriented this pixel, or any pixels? It is important to know to what ...
Frodo's user avatar
  • 2,407
7 votes
1 answer
36k views

Which is better, DEM or Triangles (TIN/Terrain)

Which is better DEM or TIN? What are the benefits/negatives of each?
Sam007's user avatar
  • 4,395
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 ...
Jake's user avatar
  • 387
6 votes
1 answer
987 views

In hydrologic terrain analysis is there a difference between "pits", "depressions", and "sinks"?

In hydrologic terrain analysis is there a difference between "pits" and "depressions"? For instance, Planchon and Darboux (2002) state The usual numerical methods for removing the depressions of a ...
Richard's user avatar
  • 1,831
6 votes
2 answers
581 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 ...
Graviton's user avatar
  • 928
6 votes
3 answers
3k views

Finding elevation differences between adjacent pixels in ArcGIS Desktop?

Is there a way to determine what the difference in elevation is between two adjacent pixels? I am using an SRTM DEM to map faults. I am using the vertical error (>16m) as a criterion for the ...
Kate's user avatar
  • 133
6 votes
2 answers
1k views

Problem Visualizing 3D Terrain Model - USGS DEM

I recently downloaded a GeoTIFF 1 arc second from the USGS National Map Viewer. I added the raster to ArcScene and attempted to visualize the data in 3D. I set the Base Height to Floating on a ...
Ashley's user avatar
  • 61
6 votes
2 answers
4k views

How to create a raster tiff (dem / heightmap) from a mesh of xyz points?

I have to create a terrain heightmap(raster tif preferably) from mesh of xyz ungridded points(in geographical coordinates), I tried taking min and max of bbox of mesh and making width & height by ...
saagn's user avatar
  • 69
6 votes
2 answers
2k views

Has TIN been superseded by Terrain Dataset in ArcGIS?

I've had version 10 for a few months but it wasn't until today that I really tested the 3D Analyst extension. (Other then visualizing data) I already noticed a lot of changes; a number of tools have ...
Jakub Sisak GeoGraphics's user avatar
6 votes
2 answers
1k views

Looking for more realistic 3D terrain renderer than ESRI Arcscene

I am looking for simple suggestions of software packages that go beyond what ESRI ArcScene can offer. I want to create 3D terrain visualisations, particularly of orthophotos draped over high quality ...
TreeMan's user avatar
  • 444
6 votes
0 answers
223 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
5 votes
2 answers
2k views

Using slope and total height for terrain analysis in QGIS?

Using QGIS I'm trying to analyse an area/DEM with these two criteria: -Even sloping terrain steeper than 1:20 and total slope height > 5 m. Finding areas with slope of 1:20 (5% slope) could be done ...
Jesper Grandin's user avatar
5 votes
3 answers
9k views

Open source tools to create quantized-mesh tiles for Cesium?

I'm looking for a tool or toolchain to generate quantized-mesh-1.0 tiles that can be used with Cesium. Possible formats for the terrain source are LAS, ASCII Grid or simple XYZ files. As a first try, ...
Karsten D.'s user avatar
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 ...
Jess's user avatar
  • 81
5 votes
3 answers
988 views

How do I use the Terrain with Labels basemap in the Map constructor

Seems like all the other basemaps can be used in the esri.Map() constructor, but this one doesn't have a corresponding entry in the list of acceptable values. I've tried just "terrain", and it didn't ...
Boris Lutskovsky's user avatar
5 votes
1 answer
266 views

Cartographic technique for detailing a 'Focus Area'

I'm working on updating a planning document. Whoever was in charge of cartography last time around used a great technique to identify and showcase focus areas (where to focus money and effort for ...
Roy's user avatar
  • 3,958
5 votes
0 answers
437 views

Using QGIS 2.14 to creating a evenly distributed grid of points, spaced 500m apart, that takes terrain into account [closed]

I am using QGIS 2.14 (Essen Version). I need to create a grid of points within a given area so that each points 500m across the ground from any other point. At these points trail cams will be placed,...
Michelle McKay's user avatar
4 votes
6 answers
5k views

shadow simulation from buildings [duplicate]

is it possible to use hillshade function in ArcMap to calculate shadow areas of buildings or simulate shadows of buildings, using DSM of the buildings and the sun angle and azimuth?
Yudine's user avatar
  • 57
4 votes
2 answers
1k views

Algorithm for smoothing DEM without losing max and min elevations

I am looking for a method/algorithm for smoothing a DEM raster similiar to something like lowpassing, however I want to keep the highest and lowest points, resp. peaks. Latter often are only ...
Arne's user avatar
  • 815
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 ...
lisagravy's user avatar
  • 529
4 votes
2 answers
1k views

Software for amateur topographic surveys

I'm interested in doing rough topographic surveys using my tripod-mounted Brunton transit compass for azimuth readings and laser rangefinder (and maybe an optical level), so obviously going to be much ...
Nathanael Coyne's user avatar
4 votes
1 answer
1k views

Converting contour lines to terrain dataset?

I have downloaded free DEM from the NET and I generated a contour line with 10 meter for interval. So, I just want to convert the contour lines to LAS point file to create a new terrain dataset. Is ...
GIS Man's user avatar
  • 1,123
4 votes
2 answers
2k views

How do I calculate the Terrain Ruggedness Index for each county in the United States in R?

I have a shapefile of US counties and high-resolution elevation data that spans the entire contiguous United States. My goal is to calculate a terrain ruggedness index for each county. The functions (...
Michael A's user avatar
  • 434
4 votes
1 answer
238 views

QGIS: Terrain accessibilty in hours/days usind DEM/CSV data

I am an Archaeologist. I am interested in settlement dispersal and land use strategies in late antiquity and early middle ages. Therefore, I want to analyze a certain terrain by: - least cost ...
Michelino's user avatar
4 votes
1 answer
2k views

Remove terrainProvider from scene (ol3-cesium)

I'm using ol3-cesium for creating 3D globe and cesium terrain provider to show terrain data on globe its working fine. this.scene.terrainProvider = new Cesium.CesiumTerrainProvider({ url : "http://" ...
vinni's user avatar
  • 191
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 ...
Sean McVeigh's user avatar
4 votes
1 answer
4k views

DTM extraction of tree heights

I need to classify tree heights in a DSM of a slope-y terrain. It´s not a forest but several individual / detached trees. In a plane terrain it won´t be an issue but in that uneven terrain I need ...
Andreas's user avatar
  • 89
4 votes
2 answers
606 views

Cesium terrain tiles too high by roughly 30m

I'm using the NED 1/3 arc second data set to generate tiles to zoom level 15 for Cape Canaveral in Florida, and finding that the terrain looks accurate in appearance, but the elevation is too high by ...
colordrops's user avatar
4 votes
1 answer
1k views

Generating vector contour map of fictional terrain [closed]

Originally I had asked this on the Graphics Design SE but after some realization of the question I was asking, it's probably better to ask it here. I'm making a fantasy world map in illustrator that ...
BB ON's user avatar
  • 149
4 votes
1 answer
1k views

How to get mean geographic direction of a polygon in QGIS?

I have a raster height model and would like to calculate the horizontal geographic direction (north, east, etc. - orientation) of each cell, then calculate then the mean value of all these cells in ...
Antoine's user avatar
  • 541
4 votes
1 answer
4k views

Usage of Cesium Geoserver Terrain Provider Plugin for a single tile of SRTM90 data

I'm attempting to use Cesium Geoserver Terrain Provider Plugin for terrain visualization. I downloaded one tile from http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp address such as 42_05 region. I ...
Bulent Ozhorasan'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
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 ...
Jakub Sisak GeoGraphics's user avatar
3 votes
2 answers
321 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 ...
Jon Altschuld's user avatar
3 votes
2 answers
2k views

Using ArcScripts that are AML from ArcGIS Desktop?

I use ArcGIS 10 I want to use an arcscript to compute an index of ruggedness for each cell of my map. For this purpose, I found, Evan's TRI.aml script here: http://arcscripts.esri.com/details.asp?...
Doon_Bogan's user avatar
3 votes
1 answer
12k views

Can Compound Topographic Index (CTI) / Topographic Wetness Index (TWI) produce negative values?

I am calculating Topographic Wetness Index for a study area using SRTM DEM (90 and 30m). I've seen several versions of TWI (CTI). I have been using: TWI = ln(As +1 / tanB) where As = ...
derelict's user avatar
  • 1,425
3 votes
2 answers
421 views

Where I can find real world data for triangulation? [duplicate]

I want points for practicing triangulation algorithms. Just points with coordinates [X,Y] and elevation [Z] of real world terrain. I can use Google Maps Elevation API, but there is no method how to ...
MicTech's user avatar
  • 133

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