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

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12
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5answers
1k views

Calculating visible sky percentage?

Can anyone explain, as simply as possible, how to calculate the visible sky percentage? I have done a satellite survey and have worked out the height of buildings and the distance between them. ...
16
votes
3answers
5k 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 ...
4
votes
2answers
291 views

Calculating the visibility of an observer walking a line transect

I was wondering if anyone can help. I'm want to calculate the visibility for an observer doing a bird survey by walking 1km transects broken up into 200m sections. I want to calculate the visibility ...
7
votes
1answer
383 views

How to create points around 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 ...
5
votes
1answer
357 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 ...
6
votes
3answers
709 views

How to Run Viewshed on one feature at time in 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 ...
2
votes
1answer
1k views

How to perform Viewshed Analysis in ArcGIS for Desktop 10.1?

I am trying to understand viewshed analysis in ArcGIS 10.1. After you add fields such as RADIUS1, AZIMUTH1 to your observer vector attribute table, does it automatically calculate visible/non-visible ...
1
vote
0answers
145 views

Viewshed analysis plugin on QGIS keeps resulting in errors

I've been trying to test the Viewshed analysis plugin on QGIS 2.10, but it keeps giving back error messages. I've tried to reduce the radius area and have also reprojected both my DEM and my point ...
1
vote
2answers
132 views

Viewshed Analysis for bridge polyline observer feature

I am using the Viewshed tool in ArcGIS 10.2 to determine the cells from a DEM that are visible from a highway corridor that has a bridge crossing a river (my observation feature). My question is in ...
1
vote
2answers
182 views

Viewshed for each pixel in raster?

please can you help me with writing script for viewshed that evaluate a count of visible cells from every pixel? Or is there any plugin that can do it?
5
votes
3answers
2k 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 ...
0
votes
2answers
130 views

Generating multiple visibility bearings in ArcGIS as automated procedure?

As a relative newbie to GIS, I'm quite sure there will be a way to do this in GIS (probably most efficiently by writing a python script!) but (to me anyway) this is a fairly complex thing to do and I ...
3
votes
1answer
332 views

Performing viewshed analysis with Dutch AHN files in QGIS?

i downloaded the new (dutch hight data) AHN files, and was trying to perform a viewshed analysis at some point near UTRECHT. The plugin (grass plugin) works ok, i tried it before with a dem map. ...
1
vote
1answer
921 views

QGIS GRASS Missing Dependancy

I want to perform a view shed analysis in QGIS using GRASS 7 r.viewshed. When I double click on r.viewshed in GRASS GIS 7 commands in the processing toolbox of QGIS I get the following message: ...
1
vote
1answer
121 views

Viewshed calculation using SQL

Can i calculate viewshed in MS-SQL server? Viewshed analysis is Raster operation. I have elevation value vector observation as point vectors. Are there any methods to calculate Viewshed (using ...
0
votes
1answer
68 views

Assessing impact of tall building on urban skyline?

I have a DSM of a small city center, and for planning purposes I wish to assess the impact of a very high building on the urban skyline. By impact I mean: given a tall building, what part of the urban ...
0
votes
1answer
80 views

Incorporate treeline in viewshed analysis

I have performed a bare-earth viewshed analysis of a roadway corridor using a DEM, but upon further inspection on Google Streetview, realize that part of the road has dense trees along it. I need to ...
0
votes
2answers
550 views

GRASS algorithm r.los does not produce raster

After running the r.los algorithm through QGIS 2.0, I'm getting a 'Problem loading output layers' box which gives the following message: Oooops! The following output layers could not be open Output ...
0
votes
0answers
44 views

How to perform Visibility Analysis using QGIS? [duplicate]

How can I calculate Visibility using QGIS? I have not found any suitable plugins for QGIS to do this.
0
votes
3answers
716 views

Problem creating a raster mosaic to run a viewshed analysis

I am using the freely available dtm data from the OS UK website (Land-form panorama and its in the ASCII format). when you download the data from the website, the dtm is found in different subfolders ...
0
votes
1answer
218 views

Problem with conducting a viewshed analysis

I am using the freely available dtm data from the OS UK website (Land-form panorama and its in the ASCII format). when you download the data from the website, the dtm is found in different subfolders ...