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

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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 ...
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19 views

How to use OFFSETB in viewshed analysis of ArcGIS for Desktop?

I am confused by the description of OFFSETB in wiewshed analysis (ArcGIS 10.1). The help documentation says: The OFFSETB item indicates a vertical distance in surface units to be added to the ...
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97 views

ArcGIS Viewshed keeps crashing

I've been trying to run a viewshed analysis in ArcGIS 10.1 and everytime I've tried running it, it crashes the whole program, with no error. See the image below. I've made sure it has OFFSETA field ...
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28 views

QGIS Viewshed Analysis Plugin

Does anyoe have a link to or know of a list of raster formats the above tool can work with? I'm on QGIS 2.8 using the latest version of the plugin. I've tried a couple of different raster types and ...
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45 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 ...
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1k views

Finding which areas camera can view from certain point inside circle of known radius using ArcGIS Desktop?

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 ...
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2answers
53 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 ...
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29 views

Automated Viewshed in QGIS

I want to create a workflow with a QGIS script where I need a viewshed tool. There is a really cool viewshed plugin. Unfortunately I am not able to access it in the QGIS console. I also found out that ...
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55 views

Calculate cells from which the feature would be visible above the skyline (horizon)

I'm trying to work out whether there is a way to do something similar to a ZTV/Visibility analysis but only include the cells from which the point (with 50m OFFSETA/height) would be visible above the ...
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177 views

viewshed analysis QGIS

I'm trying to make a viewshed complemented Quamtun viewshed analysis in GIS, someone managed to do it? in my case not allow me to finish the process skips a misconception among other things tells me ...
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62 views

How to create visibility map in ArcGIS

I want to create a visiblity map for a certain area. First I created a fishnet based on the DEM. Next i need to calculate the visible number of cells for each observer point. Using viewshed for each ...
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57 views

Need a free\open source library to calculate LOS & Viewshed using C# \ VB

I'm working in a Radio Propagation Analysis project that required to draw the Line-Of-Sight (LOS) between two radio antennas and calculating the View-shed for one radio antenna. So i need a Free\Open ...
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2answers
574 views

Performing viewshed analysis with ArcGIS Desktop Standard License?

Is there a way to perform a Viewshed Analysis with the Standard license of ArcGIS 10.1 for Desktop? If not, what is the difference (if any) between: Viewshed with (Spatial Analyst)- ...
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1k views

Difference between Viewshed and Observer Points?

Can someone explain to me in layman's terms the difference between Viewshed and Observer Points?
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1answer
90 views

Site Viewshed Analysis with DSM - Removing “false” visibility readings from trees and buildings

I've been working on modeling a proposed building and running a visibility analysis to determine from what areas the building could potentially be seen using ArcGIS Desktop with 3D Analyst. Using a ...
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82 views

Calculating vector area in QGIS

I have calculated a viewshed (ZVI) in OpenWind and opened the raster in QGIS I have then converted the raster to a vector When I open the attribute table there are 4682 rows (features) and there is ...
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1answer
585 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 ...
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3answers
4k 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 ...
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107 views

ModelBuilder, Iterate by Field and Viewshed

I want to compute the independent Viewshed for 360 different points. If I run these all together, I have one viewshed output which shows how many times any given cell is visible, but this does not ...
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78 views

OpenWind Zone of Visual Impact transparent pixels?

How do you make pixels which are not visible from a point be made transparent and the pixels which are visible opaque so that I can overlay the raster over a map to see clearly where you can and ...
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1answer
156 views

Highest resolution Digital Elevation Model for the UK?

I need the most precise and highest resolution free digital elevation model for the UK. Would OS terrain 50 or ASTER GDEM be more suitable for view shed analysis?
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2answers
119 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?
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155 views

Virtual machine or bootcamp for ArcGIS

I want to use ArcGIS for viewshed analysis on a Mac. Would virtual machine software such as Parallels or VMware Fusion be powerful enough for viewshed analysis compared with bootcamp?
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166 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 ...
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50 views

ArcGIS Viewshed's show no visibility to south east

I'm using ArcGIS 10.2.2. I've been running some viewsheds using DTM files from EDINA Digimap and data that I've imported using .csv files. These files only contain the X Y details and a code for each ...
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1answer
266 views

ArcGIS Viewshed without Observer Points

I want to create a viewshed around a LineFeature. The problem is, I have no observer points. I would like to create them with a gap of 10m around the line feature. The LineFeature should be 1m over ...
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1answer
526 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: ...
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1answer
541 views

Wind Farm Viewshed Analysis

I am new to GIS and I want to run several view shed analysis operations for wind turbines located in the North of England I have installed QGIS and have the GRASS r.los plug in installed for line of ...
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59 views

Incomplete Visibility Product

I am running ArcMap 10.2 and have been trying to complete a fairly large viewshed analysis and have chosen to use the visibility tool in order to be able to produce an optional above-ground-level ...
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104 views

GRASS and r.viewshed

I'm trying to run the r.viewshed command using co-ordinates held in a .csv file I imported using v.in.ascii. It has over 200 rows and I'm looking to run viewsheds from each line, without doing it ...
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3answers
513 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 ...
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80 views

Can Viewshed produce area results per point feature?

I want to quantify how much land individual point features can "see" using the Viewshed tool. I can generate a complete/universal raster surface, but not one that itemizes the number of cells visible ...
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54 views

Viewshed over Multiple DEM Models Possible?

I finally got the viewshed working correctly over one DEM model. However, I am wondering is it possible to do the viewshed over multiple DEMs? E.g. A Multiple County Viewshed based off one point. ...
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152 views

ArcGIS 10.2 Viewshed not using Z Value?

I'm currently trying to produce a line-of-sight map of a tower with no results. Every time I run the viewshed tool, the program uses the base Z value of the DEM. I use the DEM Raster for the ...
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74 views

Background (sky/terrain) of a viewshed

Is it possible to determine whether a point feature of a particular height would be backed by sky or by terrain? I've done the viewsheed analysis of a wind turbine. Now I would like to make a raster ...
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1answer
195 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 ...
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2answers
103 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 ...
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106 views

r.viewshed - Can't find with Grass toolbox

I'm trying to use r.viewshed and have got Grass installed but can't find it anywhere! under toolbox, I click 'Grass commands (152 geoalgorithms) and have a choice of imagery, raster, vector, etc, ...
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131 views

how create a specific sub-study area in ArcGIS 10.1 - difficulties with classification

My study area is quite large (sometimes spanning across a few grid squares) and when I am running a viewshed analysis or calculating slope or euclidean distance it calculates for the entire region. ...
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188 views

How to write script for Line of sight and Viewshed analysis in Global Mapper

I wanted to write script in Global Mapper for Line of Sight and Viewshed analysis. I tried to calculate using Viewshed and Global Mapper Tools but the issue I am facing is that analysis is user ...
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95 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 ...
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94 views

Wind Farm Viewshed/ZTV

I've created an ArcGIS tool using ModelBuilder and Viewshed to create a wind farm ZTV and whilst each raster cell tells me whether there's visibility or not it doesn't tell me what the vertical angle ...
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3answers
187 views

Calculate Number Of Pixels Visible From Pixel

I am looking for a way in which to take an input DEM and create an output raster whose pixel's value is the count of pixels "visible" from that location. I use ArcGIS with Spatial Analyst, but also ...
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1answer
69 views

RuntimeError from r.viewshed in graphic modeler

after using r.los in QGIS want to switch to r.viewshed in GRASS GIS 7. i need to do a lot of viewshed analysis form given points of a vectorlayer. if i try to add r.viewshed to the graphic modeler i ...
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448 views

Viewshed Analysis ArcGIS 10.2.1 [duplicate]

I'm wondering if anyone can help me out. I'm trying to carry out a viewshed analysis of wind farms and single turbines on a region of the UK. I have the landform data as well as the coordinates of ...
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3answers
2k views

Viewshed / Line of Sight analysis- as a batch process?

I wish to carry out a line of site analysis similar to the subject in here (preferably within QGIS): Visual Impact Assessment in QGIS or GRASS Scenario: I have two points, A and B. Point A is a ...
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2answers
435 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 ...
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1answer
94 views

Wind turbine placement optimization and loss on surrounding house value

I am doing a geostatistical placement optimization study on where would be the optimal placement of a wind turbine in a Danish region. One of the variables taken into account is the cost on the value ...
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79 views

arcGIS observer point analysis: Exceeding maximum allowed points amount not exceeded

I need to make an observer points analysis (3D analyst tool). I have a shapefile of 22 points, so I divided it in 2 layers of 11 each as the maximum points allowed is 16. However, as I launch the ...
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135 views

Can QGIS create a “virtual view” from a given position?

I would like to be able to choose a position on a map (by clicking, or by entering an address, or other means -- please suggest) and have an artificial picture created, like what I would see if I ...