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

learn more… | top users | synonyms

-1
votes
0answers
11 views

ZTV Viewshed Query regarding number of 'observed by'

I want to run a ZTV using ArcGIS preferably, i have an alignment of pylons and i need the output to tell me how many pylons would be visible for each area. I'm not 100% i can do it in Arc and would be ...
1
vote
0answers
64 views

Performing Viewshed Analysis in ArcGIS?

I have a series of observation points with heights specified within a long-integer type field. Points and DEM are in the same coordinate system. When I run the Spatial Analyst - Viewshed tool, the ...
0
votes
0answers
15 views

Viewshed Ouput to take into account obstacles/barriers in ArcMap 10.1?

Working on ArcMap 10.1 Basically, I am doing a ZTV (Zone of Theoretical Visibility) "Viewshed". I have completed the analysis for bare earth, just on the DEM surface. But as an addition I need to ...
1
vote
0answers
129 views

Calculating vector area in QGIS? [closed]

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 ...
4
votes
2answers
327 views

Site viewshed 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 ...
0
votes
0answers
25 views

Arc Viewshed2 requires a vertical coordinate system

When I use the Viewshed2 tool with Arc 10.4, a 010451 error results when I try to add the input raster layer to the tool. The error states that the input raster is missing a vertical coordinate ...
0
votes
0answers
9 views

ESRI Mosaic Dataset returns error when used in Viewshed tool

Using Arc 10.4 I've created a Mosaic Dataset for Alaska's north slope region. The source rasters are NED 1/3 arc-second Arc Grids, single band, 32-bit floating point DEMs that have been projected to ...
0
votes
1answer
23 views

ArcGIS Model - Iterate Row Selection - Multipal viewsheds

I've a CSV file with 106 rows with data suitable for a viewshed. What I want to do is run an ArcGIS model where it works through the rows and produces 106 viewsheds for me (ideally the data could ...
12
votes
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. ...
1
vote
1answer
47 views

Viewshed plugin results in memory error in QGIS 2.6

Everytime I use the viewsheds plugin up to this point I get an memory error. I projected my raster files and the point which I added as an observervation point into a metric system (EPSG:3857 - WGS 84 ...
0
votes
0answers
55 views

I get the following error with QGIS on Windows 10 while rerunning q viewshed query that had been ok on MacOS

An error has occured while executing Python code: Traceback (most recent call last): File "C:/Users/marys/.qgis2/python/plugins\ViewshedAnalysis\viewshedanalysis.py", line 194, in run ...
1
vote
2answers
38 views

Determining which specific features are visible from observer points using ArcGIS 3D Analyst?

I am working on a wind farm proposal. I have the positions of 70 proposed turbines. I also have the positions of 80 houses within 20km of the proposed turbines. I created a viewshed for the 70 ...
2
votes
2answers
41 views

Viewshed analysis with polygons

I'd like to do a viewshed analysis of mines in the midwest. What I have are point features indicating the location of the mines. I also have an acreage field, which I could use to expand from the ...
4
votes
2answers
157 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 ...
1
vote
1answer
34 views

Performing Viewshed Analysis for Transmission Line returns general error 999999?

I have a scenario where a transmission line is designed and placed with heights for each structure. With that being said, it is to be proposed to the forest service who is more concerned with how ...
1
vote
1answer
55 views

Specify target elevation with r.viewshed in QGIS processing toolbox?

How do I specify the target-height in r.viewshed when using the operator through QGIS's processing toolbox? It doesn't seem to be available. Who should I contact to adjust the interface such that the ...
2
votes
1answer
331 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 ...
0
votes
0answers
20 views

Refining a Viewshed

I have been tasked with finding the observable area of a canoe route based on a drainage, stream and contour file. First, I made the drainage a line file and then merged it with the stream. I then ...
1
vote
1answer
55 views

Viewshed analysis without observer point?

I want to find the most visible point within an area.. I don't have an observer point, I want to find it. based on the highest points, I've created scenarios and compare.. However there might be an ...
1
vote
1answer
92 views

Error when using viewshed analyis plugin with merged shapefile

I am using Qgis 2.12Lyon and try to run a viewshed analysis to show the intervisibility between several points in more than one shapefile. I have a digital elevation model (.tif) which is projected ...
1
vote
0answers
70 views

Viewshed Analysis for total beginner [closed]

I am totally new to doing this using QGIS. Can anyone help me to produce the following, which I believe is commonly known as a ZTV analysis. I am running Wein and have the Viewshed Analysis plugin ...
1
vote
1answer
70 views

In qgis2threejs html output select deselect the layers not working

I used qgis2threejs to output 3d model with a dem and another viewshed output. I want to tick untick the layers for displaying and not displaying the layer.But the select unselect option in right ...
1
vote
1answer
259 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 ...
0
votes
0answers
21 views

UK Environment Agency Lidar data [duplicate]

I have recently downloaded LIDAR data from the Environment Agency website in the form of asc file. In order to perform some viewshed analysis do I have to convert these files into a raster file and ...
4
votes
0answers
88 views

Incomplete Visibility Product [closed]

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 (AGL)...
3
votes
1answer
365 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. ...
0
votes
0answers
43 views

Problem with Viewshed analysis in ArcObjects

I want to execute the Visibility Analysis Tool using ArcObjects 10.3. I tested the tool in ArcMap and it works great with the test data I provided, hence it should work as well in ArcObjects code. The ...
3
votes
1answer
88 views

Problem creating viewshed raster in QGis - output black

I am trying to do a viewshed analysis in QGis using the viewshed analysis plugin in QGis repository (https://hub.qgis.org/projects/viewshed/). I had as base elevation contours in shp format with ...
0
votes
0answers
28 views

Changing defult values in Viewshed tool

How is it possible to define my own values for (OFFSETA, OFFSETB, AZIMUTH1 , AZIMUTH2, VERT1,....) instead of defined default values in Viewshed analysis in ArcGIS?
1
vote
1answer
101 views

Viewshed plugin in QGIS doesnt work

I loaded DEM and Point data and as a result i just got black raster (still black after calculation). If I click intervisibility I cant see it like if line data is not there. I tried changing meters, ...
1
vote
0answers
45 views

How to create separate viewsheds for individual points?

I have a feature class with 3000 points. My goal is to have a viewshed, at each point, clipped to 50m and 500m buffers. I want to be able to look at the percent visible/not visible for each point. I ...
0
votes
1answer
75 views

Viewshed analysis on building

I'm trying to run a viewshed analysis of building. My original building layer was a vector which had a height attribute. I converted this to raster and added my elevation layer to my building raster ...
2
votes
3answers
300 views

Viewshed Analysis - use DSM or DTM?

I need to run a Viewshed analysis (ESRI 10.2 spatial analyst tool) to answer this: what areas will be able to see a proposed 30m high structure. I have the choice of a DSM or a DTM to use as the ...
2
votes
1answer
131 views

Line of Sight and Viewshed Discrepancy

I am having a problem with the line of sight tool and viewsheds on ArcGIS 10.1. This is for a viewshed analysis of pillboxes and defences in a particular area in Malta. I am using a DTM with a 1m ...
5
votes
2answers
4k 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 ...
2
votes
1answer
266 views

Error memory on Viewshed Analysis plugin QGIS [duplicate]

My question is exactly the same as TTome! (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 ...
1
vote
0answers
158 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
1answer
65 views

How do I get the distances to every cell in GRASS?

I have an elevation raster map, a point, a raster map defining the viewshed from that point, and now I want to produce another raster map with the results of a function of the distance between the ...
1
vote
0answers
45 views

Viewshed with RpyGeo “rpygeo.Viewshed.sa”

This function is not working: rpygeo.Viewshed.sa(mnt, pt,out.raster="viewshed") *Error in as.character.default(<S4 object of class "RasterLayer">) : no method for coercing this S4 class to ...
10
votes
2answers
2k 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 ...
1
vote
0answers
24 views

Point to point best link finder, need script?

I am planning a point-to-point microwave system in a geographically very hard area where it is full of mountains. I was searching if there is a way that I set a point and then script a code to search ...
0
votes
1answer
48 views

Vertical section of viewshed

How can someone make this vertical section of a viewshed analysis (e.g. in ArcMap)?
0
votes
1answer
71 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 ...
1
vote
1answer
92 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 ...
0
votes
1answer
83 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 ...
3
votes
1answer
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 ...
1
vote
2answers
141 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 ...
0
votes
2answers
97 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 ...
-1
votes
1answer
725 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 ...
1
vote
0answers
177 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 ...