The vertical and horizontal dimension of land surface

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6
votes
3answers
1k 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? Thank you.
21
votes
4answers
3k 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
202 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 ...
7
votes
4answers
512 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 ...
1
vote
3answers
197 views

Terrain Beautification

The satellite imagery i am rendering is not realistic does not look good. So i was planning to improve things through code(like adding noise to data or using different overlay texture for different ...
6
votes
2answers
328 views

Auto Balancing in EarthWork

I am not sure whether this question belongs here. I think it belongs more to Geo-technical, but anyway, I just give it a shot. During earthwork development, earth terrain has to be cut ( if the ...
3
votes
4answers
4k 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 ...
6
votes
3answers
1k views

How to find the elevation differences between adjacent pixels in ArcGIS?

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 ...
2
votes
2answers
316 views

Where I can find real world data for triangulation?

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 ...
3
votes
6answers
2k views

shadow simulation from buildings

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?
0
votes
0answers
628 views

buildings shadow areas calculation

is it possible to calculate shadow areas of buildings or simulate shadows of buildings in a city using e-cognition software, with the DSM of the buildings and the sun angle and azimuth known?....if ...
2
votes
1answer
143 views

What is a “CFG” application in GIS terminology probably?

I come across a 2008 tech presentation PDF on "GIS-Enabled Modeling and Simulation (GEMS) presented by ESRI (i think for the US Army). On one of the page titled "Challenges to be overcomed", there is ...
8
votes
7answers
1k 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 ...