Tagged Questions

A viewshed is an area that is visible from a specific location.

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12
votes
2answers
1k views

Visual Impact Assessment in QGIS or GRASS

Is it possible using QGIS or GRASS to perform a Zone of Visual Impact assessment? E.g. where can a 100m high structure be seen at a viewing height of 1.8m within 30km, taking into account elevation ...
12
votes
2answers
186 views

Propose a new location for Watch Tower using Viewshed Analysis

I want to suggest location for new watch tower in a forest area, but i am confused , on what criteria i can propose a best location. If i am taking DEM , slope and distance from existing tower , ...
9
votes
2answers
439 views

How to implement viewshed calculation?

I'm looking for a way to implement visibility (aka viewshed). I found a previous GIS SE question that suggested a few GIS applications (not what I need - I'm trying to embed the calculations), and ...
9
votes
1answer
126 views

How to find the buildings (polygons) a user can see from a given location (point) and orientation (angle range)?

I would like to retrieve the set of buildings I can see from a given location (point -lat,lng) and orientation (interval of angles) + certainly with a given depth (e.g. 100 meters). Ideally I would ...
5
votes
2answers
1k views

Viewsheds and Observer Points in ArcGIS Spatial analyst

I am trying to understand the viewshed and observer points tool in spatial analyst. I want to show which areas of land can see a wind turbine, or put another way, from where can the wind turbine be ...
4
votes
3answers
86 views

Run Viewshed on only one feature at a time in a shapefile

I have over 100 features in a shapefile and I want to create individual viewsheds for each and then run processes on each of those resulting viewsheds in ArcGIS using Python. Is it possible to write ...
4
votes
1answer
75 views

Create points around the edge of viewshed results?

Is there a tool or module, or multiple tools, in ArcGIS that will allow you to automate the creation of points around the outer edges of a viewshed? What I am trying to do is gather data about the ...
4
votes
1answer
68 views

Sum raster data visible from given point, by proportion of view

I am wondering if there is a tool that does the following (preferably in Arc but other options considered). Simple example: what proportion of the view from a given point on the landscape is occupied ...
4
votes
1answer
75 views

Help installing add-on in GRASS, I get an error message

My Grass gives me this error message, Grass_info_error(4816,1):'make' required. Please install 'make' first. This happens when I attempt to fetch an add-on (r.viewshed). What am I doing wrong? and ...
3
votes
1answer
103 views

What's the difference between Viewshed and Observer Points?

Can someone explain to me in layman's terms the difference between Viewshed and Observer Points? Thanks.
3
votes
1answer
307 views

Viewshed analysis problem Arcgis 10

I am trying to find which areas a camera can view from a certain point inside a given circle (known radius). I tried to use the Viewshed tool Arcmap provides in order to do that. I read here that I ...
3
votes
2answers
149 views

How to use Collect Values with Cell Statistics in iterative model in ModelBuilder?

I'm trying to run multiple viewsheds in ArcGIS 10, reclassify these rasters and finally add them together. This is for a wind farm project where we need to repeat multiple viewsheds from various ...
3
votes
1answer
141 views

SAGA-GIS:Viewshed creation from SHP instead of interactively?

I am using Saga-GIS to calculate a viewshed from a single point. I can do this with the interactive module, (terrain analysis > Lighting > visibility (single point) interactive) but how do I do it ...
3
votes
1answer
63 views

Error in viewshed (arcgis)

I have a point data as observer point with field attributes for Spot, offsetA, offsetB, Radius1, Radius2, Vert1, Vert2, Azimuth1 and Azimuth 2. For the raster file- a dsm with elevation data. They ...
2
votes
2answers
146 views

Can I perform a viewshed analysis with ArcGIS Desktop 10.1 - Standard License?

Is there a way to perform a Viewshed Analysis with the Standard license? If not, what is the difference (if any) between: Viewshed with (Spatial Analyst)- ...
2
votes
3answers
489 views

Viewshed Analysis With GDAL

I am looking to perform a simple (one observer location) viewshed analysis on a standard DEM using GDAL (either python or .NET bindings). I have searched, but haven't found any readily available ...
1
vote
1answer
211 views

Using SRTM data, how to get the coordinates of the peaks visible from a location?

Using SRTM data and a coordinate-altitude database of the peaks, I want to get the coordinates of the visible peaks from my location. I want to make an application similar to this. How is this ...
1
vote
2answers
60 views

viewshed analysis for observers wearing visors?

I'm starting with a DEM, and looking to identify every point that can be directly "seen" from any point in a particular polygon on an overlaid layer defining an area on that DEM - like any other ...