The vertical and horizontal dimension of land surface
3
votes
2answers
96 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 ...
0
votes
1answer
40 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 ...
0
votes
0answers
55 views
arcpy Add Feature Class to Terrain error. LiDAR Processing Script
So here's another one for you ever so helpful StackExchangers (is that right?) Anyway, I'm writing a script to convert lidar data (in .las format) into a terrain without going through all the ...
3
votes
1answer
100 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
97 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 ...
0
votes
1answer
242 views
Calculate CTI TWI using raster calculator: Negative values
I am calculating Topographic Wetness Index for a study area using SRTM DEM (90 and 30m).
I understand there are many "flavors" of TWI (CTI).
I have been using: TWI = ln(As +1 / tanB)
where As ...
6
votes
3answers
355 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.
1
vote
1answer
51 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 ...
1
vote
0answers
26 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 ...
21
votes
4answers
695 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
2answers
227 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 ...
1
vote
0answers
123 views
ArcGIS Reference Layer over ArcGIS Terrain base(or Imagery) Layer using OpenLayers
I am using Openlayers for a Map application which uses basemaps by ESRI (or ArcGIS). What I am trying to achieve is something like this:
http://www.arcgis.com/home/webmap/viewer.html
From Basemaps ...
8
votes
1answer
324 views
Floodplain generation given river section polylines, flood level elevation points and a DEM of the land surface
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, given the following datasets:
1) River cross section ...
5
votes
1answer
160 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
3answers
140 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 ...
5
votes
1answer
2k views
Which is better, DEM or Triangles (TIN/Terrain)
Which is better DEM or TIN?
What are the benefits/negatives of each?
1
vote
0answers
236 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 ...
11
votes
7answers
310 views
How to generate a random but believable digital elevation model?
Is there a way to generate a DEM, programatically or otherwise (arcpy or R?), that will feed into ArcGIS for further spatial analysis?
Perhaps this needs to be broken down into smaller incremental ...
5
votes
1answer
308 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
4answers
2k 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 ...
13
votes
5answers
1k 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 ...
6
votes
3answers
730 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 ...
14
votes
7answers
3k 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 ...
4
votes
2answers
238 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 ...
2
votes
2answers
238 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 ...
0
votes
0answers
484 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 ...
3
votes
6answers
1k 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?
7
votes
7answers
12k views
How can I create profile cross-sections in ArcGIS 10?
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
1answer
134 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 ...
7
votes
4answers
361 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 ...
7
votes
7answers
602 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 ...
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