The vertical and horizontal dimension of land surface

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4
votes
6answers
3k 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?
2
votes
1answer
181 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 ...
3
votes
1answer
1k views

Google Earth import terrain

Today, Google Earth allows you to import images to overlay on existing terrain. Is it possible to import custom terrain to replace default terrain in Google Earth? There doesn't appear to be any ...
2
votes
1answer
1k views

Creating 3D terrain/model from contour lines, preferably using Open Source GIS?

I am looking to create 3D terrain from a contour map that I have (originally inside a PDF). The contour lines are able to be viewed as paths in Adobe Illustrator. There are two types of lines: 7m and ...
2
votes
1answer
690 views

Cause of ERROR 000539: Error running expression?

The following errors in ArcMap are preventing me from moving forward: 1) In Raster Calculator using "Aspect": "%DEM_Aspect%" <= 90 or "%DEM_Aspect%" >= 270 ERROR 000539: Error running ...
3
votes
1answer
171 views

ArcPy delete terrain: cannot be deleted

I can't get my ArcPy script to delete a terrain. If it exists, it should be deleted. However it throws an ERROR 000317: {path} cannot be deleted My script is a lot longer than this, but this is ...
0
votes
1answer
381 views

Wrong Terrain Height Information

I am getting negative elevation values from CesiumTerrainProvider (stk-terrain). For few locations the below code is giving negative elevation values, which are wrong, as I have checked those values ...
7
votes
1answer
12k views

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

Which is better DEM or TIN? What are the benefits/negatives of each?
3
votes
1answer
996 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 ...
0
votes
1answer
122 views

Is there a difference between the two sets of QGIS terrain analysis tools?

Is there a difference between Raster/Terrain Anaylsis and the same features in Raster/Analysis/DEM (Terrain Analysis)? The two appear to do the same types of computations; are they the same or is ...
0
votes
1answer
357 views

Why do I get these bands on my Height/Dem/Raster

I can't seem to get rid of them, and I've no idea (ok scrap that, I have a vauge idea) whats causing them. First an apology, yes this is quite a large pic apologies, but here goes: How to ...
7
votes
1answer
2k 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 ...
1
vote
0answers
72 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. ...
4
votes
2answers
193 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 ...
3
votes
2answers
549 views

Which Statistical Test to use?

I aim to determine whether there is a correlation between terrain variables (elevation, aspect and slope) and structural information acquired in forest survey. I have used ArcMap's extract multi ...
4
votes
2answers
716 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 ...
3
votes
1answer
203 views

How to export data from saga or tas into excel?

I want to derive terrain attributes from DEM with saga and whiteBox GAT (SAT). I have problem in exporting data into excel. would you help me?
2
votes
2answers
74 views

Return Image from WMS service

I asked this question, and I realize that I am going in the wrong direction. So, I would like to do this : var geom = new THREE.Geometry(); // push vertices here var some_material = new THREE....
2
votes
2answers
411 views

Terrain Accessibility map using GIS (ArcGIS or QGIS)

I need to make an accessibility map showing the walking distance based on the terrain and availability of road networks, could anyone point me in the right direction where i could learn to do so. ...
1
vote
0answers
31 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 ...
2
votes
0answers
118 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 ...
1
vote
0answers
63 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 ...
5
votes
3answers
520 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 ...
3
votes
0answers
749 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). ...
2
votes
1answer
137 views

Query DEM Elevation at Point in QGIS

I'd like to be able to pull up a DEM (or create a mosaic of them) and simply query the elevation at points I click. Is this possible using QGIS?
1
vote
1answer
340 views

ArcPy error: Add Feature Class to Terrain. [closed]

I'm writing a script to convert lidar data (in .las format) into a terrain without going through all the clicking and so I can send it out to neighboring states with similar programs (I'm using ArcGIS ...
0
votes
1answer
1k views

3D Analyst Line of Sight: what am I doing wrong?

As a relatively new user to GIS trying out 3D Analyst tools, I'm trying to run a Line of Sight which is not working the way I'd expect. Note I'm running the tool straight from the toolbox, no python ...
1
vote
1answer
158 views

Wireframe display of terrain in ArcGlobe?

I have successfully imported a terrain dataset into ArcGlobe which provides elevation values to the globe surface. Is there an easy way I can now change the symbology/display of the terrain/globe ...
2
votes
1answer
7k 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 = ...
5
votes
1answer
421 views

Generating a vector contour map of fictional terrain

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 ...
2
votes
0answers
132 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 ...
1
vote
1answer
619 views

How to create a profile with profile points at discrete altitude intervalls, e.g. each 10 m

In both SAGA and QGIS theres a profile-from-line-function that does a nice job of creating profiles. But there's no way to control the altitude spacing. Any ideas for workflows that would allow me ...
4
votes
1answer
2k views

How to create contours from smoothed DEM instead of using Terrain to Raster?

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 difference in the accuracy ...
0
votes
1answer
138 views

How to obtain buildings base (Ground) Height from Esri Terrain Dataset?

How can I join Height data (surface, DTM) from terrain dataset to buildings polygons ?
3
votes
2answers
2k views

Is it possible to give 2d contours a Z-height from their attribute table in QGIS? (Or ArcGIS?)

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 ...
3
votes
2answers
1k views

Using ArcScripts

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?...
8
votes
2answers
2k views

Floodplain generation given river section polylines, flood level elevation points and a DEM of the 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: 1) River cross section polylines ...
18
votes
5answers
5k 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 ...
9
votes
2answers
1k views

TRI, TPI, or Roughness

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 ...
3
votes
2answers
397 views

Hillshade for 30m NED at continental scale

I'm new to terrain analysis. I have a 30m NED DEM (.tif) for the conterminous US. I would like to generate a nice looking hillshade for the US, but it looks bad - as in pixelated and rough (See image)....
6
votes
2answers
695 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 ...
0
votes
1answer
172 views

Correlation and terrain databases [duplicate]

I would like to know what kind of computation I could perform on a terrain database. I'm making terrain for VBS2 from raw data (shp files and DTM Elevation files) and then I'd like to be able to check ...
1
vote
1answer
286 views

calculating terrain elevation line

I found too many hits on the web to even see the right direction to go. I have to provide a small proxy server serving requests for a line of terrain elevation data between two coordinates. It is a ...
19
votes
7answers
7k 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 ...
3
votes
1answer
453 views

Hydro-Enforced/surface constraint DEM Creation using GRASS/QGIS

I am wondering if there is a way to create a hydro-breakline enforced DEM by means of any open source solution? I am able to create a DEM from Lidar data using GRASS, but would like to enforce some ...
1
vote
1answer
81 views

How to conflate terrain data?

I have an 8 km by 8 km raster of 20 m/pixel terrain data. The georeference data has been lost. All I know is that it's within 100 km of Smithers, BC. I realize that this might involve some very heavy ...
24
votes
4answers
5k views

How to calculate terrain Curvature?

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 ...
5
votes
1answer
223 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 ...
1
vote
0answers
32 views

Styling a raster on relief shading analysis [duplicate]

Possible Duplicate: How to create a style file for QGIS from a plain text file? I have a text file which contains the following data eleva R G B 0 153 255 153 100 179 255 179 ...
7
votes
4answers
582 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 ...