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Questions tagged [viewshed]

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

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Errors while viewshed analysis in QGIS

I want to analyze viewshed from some point. For that, I installed the viewshed plugin, and run it. elevation raster: dem observation points: observer(only one point) But it just shows the message "...
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Viewshed on QGIS 3.2 missing values

I'm trying to calculate viewshed from a set a points (gpkg). From what I can understand, I first need to run the "create Viewpoints" algorithm. After I do it, a new layer named "output" is created, ...
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1answer
44 views

Executing r.viewshed (GRASS) in R

What libraries do I need to execute this GRASS tool (or any other) from an script in R ? Has anybody try to compare performance between using r.viewshed from QGIS and r.viewshed from R ?
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Determining minimum observer point height

I'd like to do a viewshed analysis which determines the minimum observer point offset to achieve line of sight visibility. Is there any way to create something like an out_agl_raster which shows ...
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1answer
39 views

Visibility of multiple points from one other point?

I am fairly new to GIS and am struggling a little with one of my maps. I have to see if 49 wind turbines (200m) are visible from a radar that is 39.6m high, I understand I need to do viewshed but ...
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2answers
66 views

Viewshed Analysis adjust for treetop/building roof classifying as visible

I need to depict the areas that a landfill will be visible within a 3-mile radius at the current height. After pouring over the ARC Visibility toolset page, my thought is that the Viewshed tool is ...
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1answer
28 views

Viewshed Analysis for Custom DEM file [closed]

I am new to qgis and trying to do 2 things. My objective is to have an accurate viewshed analysis at the end. But my DEM file is of poor resolution. I do have a shapefile with building height ...
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1answer
28 views

Calculating Viewshed of a region rather than a point [closed]

There are various calculations to find the viewshed of a point and all of them have different runtimes. the fastest is the calculation of line of sight angle and compare with upcoming cells. But what ...
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1answer
50 views

How to find how grass's r.viewshed works programmatically?

I want the Python source code of Grass's Viewshed analysis. In QGIS software there is only an .exe file of that algorithm. Although I'm not sure whether it's written also in python or not. Where can ...
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0answers
24 views

Least cost path from visibility

I use ArcGIS 10.1 and I am dealing with viewshed and least cost path analysis. I would like to generate a path on the basis of a cost surface taking into account the viewshed data as indicated in the ...
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Calculate radial distance from a central point (kind of viewshed, but not viewshed?)

I would like to do the following, complex(?) GIS analysis, for which I just can't seem to find the right tools/protocols. On a binary raster, I would like to calculate, for every cell, the average ...
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2answers
64 views

GRASS r.viewshed from Python with multiple raster tiles

I'm new to GRASS and struggling to do a viewshed across multiple tiles. I have got the GRASS r.viewshed function working from Python as follows for a single tile: gis_path = os.path.join(output_dir, '...
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1answer
42 views

Is there a way to calculate a viewshed from n number of points? e.g., what is the cumulative viewshed when using each corner of a building

I'm attempting to run a viewshed analysis in QGIS using r.viewshed, but the terrain is hilly and building is wide and low, so I get dramatically different results depending on which corner of the ...
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1answer
50 views

Selecting Features in Visible Viewshed Areas using QGIS?

In QGIS 3.2 I have a viewshed raster and a shapefile with point features I'd like to select the points that intersect the visible areas of my viewshed. Is there a way to extract a vector of my ...
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47 views

Insert point layer as input for GRASS viewshed in QGIS 3.2 modeler

I’m building a QGIS (3.2 Bonn) tool for my colleagues using graphical modeler. The tool should get 3 inputs: DEM raster layer, vector layer of points, vector layer of a point of interest (POI). The ...
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1answer
63 views

Add building height as obstructions to viewshed analysis in ArcGIS Desktop?

I have LAS data. I have made a DEM from the LAS points. I have a Z-enabled polygon feature representing building footprints. Somehow I need to incorporate the height of the buildings into my DEM so ...
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1answer
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Horizon line of a vector point from terrain raster - global mapper

Is there a possibility to calculate the horizon line of a point with global mapper, not the viewshed, but just a line (or polygon) joining all the furthermost points from A and are at the same time ...
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42 views

Exclusion zones (for trees/buildings) in QGIS Viewshed

Is there a way to set up an 'exclusion zone' in a viewshed in QGIS? For example, I want my viewshed to take into account a large block of screening trees in it's calculations, to see how the ...
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Viewshed analysis adding polygon mitigation in QGIS?

I am looking at a DSM layer in QGIS and have created a binary viewshed using the viewshed analysis plugin. I want to add a polygon layer with heights to add on top of the dsm layer to indicated ...
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1answer
95 views

Creating OFFSETA field for viewshed analysis in ArcGIS Desktop?

I'm trying to create a viewshed where the observer point is a person standing. I have the point feature but it didn't come with an OFFSETA field, which I know is how you set the observer height. How ...
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1answer
48 views

r.viewshed output location

I'm very new on GRASS and trying to extract the viewshed of a SRTM HGT file. This is what I've done so far: (why I'm using GRASS command line this way is not in question. Please answer this same way) ...
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2answers
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r.viewshed.cva error: No points found, nothing to be exported

I need to do an intensive viewshed and I am going to use our university SCC (Linux). I am running a test viewshed with only 13 observers (just to build the code - eventually the script will be used ...
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QGIS viewshed output is null — incorrect

I am trying to run a very intensive viewshed in ArcGIS but university power outages are forcing me to use our SCC, which runs on Linux, so I need to use Grass and Q. I am running a much smaller test ...
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0answers
95 views

How to calculate Viewshed from a DEM file using a command line tool?

I need to take a polygon that show the viewshed given a point in a DEM file to ask the question: "What can I see from here to X kilometers ? " I already read this Performing viewshed analysis with ...
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Calling Grass Raster Functions from Python and Using NumPy Array as the Input?

I have been trawling the internet for a solution, but so far no luck. It seems inefficient that when calling the Grass function r.viewshed from within python, that I have to import the raster tif ...
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1answer
156 views

'Cumulative' Viewsheds in QGIS

I have 7 shapefiles, each containing a set of points. I want to run a 'cumulative' viewshed calculation, which shows not how many points I can see in total, but how many of the 7 shapefiles can be ...
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1answer
492 views

Performing viewshed analysis in R?

I have made some web search but coultn't find any answer regarding how to perform viewshed analysis in R without the use of external tools (e.g., GRASS). I do know that a number of interesting ...
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0answers
56 views

Performing viewshed in QGIS with GPS satellites?

I want to do viewshed analysis in QGIS. My observer points are gps satellites the actual elevations are scaled down from 35000 kms to 1500m but the positions are accurate i,e elevation and azimuth. ...
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1answer
77 views

r.Viewshed GRASS function returns NaN insteat of 0 and 1 for 1 in -b Boolean Mode

r.Viewshed GRASS function returns NaN insteat of 0 and 1 for 1, i am not not able to recode NaN Values to 0 with r.recode function. How to reclassify or recode raster from 0 to 1? pl. Help
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1answer
344 views

ERROR 000875: Output raster is an invalid output workspace

The following script uses the function viewshed2 and works without problems: import arcpy from arcpy.sa import * import os import datetime #Input parameters location = arcpy.GetParameterAsText(0) ...
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1answer
64 views

Determining height of polygon to block view of point as seen from polyline feature?

With ArcMap 10.5, I have the following data: a polyline (trail) from which a 2m observer will be looking; a polygon (mound of dirt, consider it flat on top) whose height can change; the height of ...
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1answer
67 views

Geoserver viewshed WPS not found

I've googled for making viewshed analysis using Geoserver WPS, but didn't find any result. Also I've searched the WPS functions that Geoserver supports but didn't find viewshed. Does Geoserver ...
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1answer
239 views

Finding point with largest viewshed using QGIS?

I have a large number of points (2600) and I need to rank them by the size of their viewshed. I have been using the Viewshed Analysis plugin in QGIS, but I can only select the option for a cumulative ...
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1answer
216 views

Viewshed Analysis Memory Error in QGIS 2.18.15

I have been trying to run a Viewshed Analysis on a point layer containing approximately 174 points on a DEM compiled from the SRTM 30m Elevation data available at http://dwtkns.com/srtm30m/ After I ...
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2answers
72 views

viewshed analysis for GPS satellites

I have raster DEM and observer points (satellites) both are in the same coordinate system.The observer points are scaled down so that they are not very far away from the raster DEM (say at 500-800 m ...
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1answer
124 views

Viewshed calculation throws “ERROR 010462: Geodesic visibility exception:”

I'm trying to calculate the viewshed from a given point on the top of a building and I'm using the following line: VS2 = Viewshed2(DSM_model, 'fl_Opt_Prospect', VS2_agl_raster, 'FREQUENCY', ...
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1answer
79 views

viewshed analysis: how to assess the visibility of at least the top 3m of a tower?

This is a follow up question to Viewshed analysis: how to assess the amount of a building that would be visible? Unfortunately, I have no access to ArcGIS' Viewshed2 tool. I want to perform a ...
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1answer
113 views

Viewshed analysis: how to assess the amount of a building that would be visible?

I am performing a Viewshed analysis in ArcGIS (10.1), and I use an OFFSETA (observer) of 1.7m and an OFFSETB (target) of 6m. The latter is the height of a typical building for which I wish to estimate ...
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1answer
43 views

Incorrect cell count with viewshed analysis

I am performing several viewshed analyses. As I wanted to observe how the viewshed changes when setting a different value for OffsetA I noticed something strange was going on with the cell count. ...
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1answer
195 views

Determining percentage of points visible within viewshed using ArcGIS Spatial Analyst?

I have done a viewshed (ArcGIS Spatial Analyst 10.5) on a DEM raster layer, where a limited amount of observer points (5) are aiming to capture as many points as possible on this DEM surface. The ...
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1answer
76 views

Query 200-300 viewshed rasters from a vector layer with z-values with QGIS

What I got: 200-300 invisibility depth viewshed rasters with information about how tall buildings can be without being visible from the viewshed points A vector layer with a planned building as a ...
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1answer
91 views

Seeking algorithm to find point on surface with highest visibility?

I have a DEM which I want to find a point with largest amount of visibility ,I know that viewshed leads to visibility from a point but how can I find a point with highest visibility ? One way is to ...
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1answer
195 views

Viewshed analysis not working

I am trying to understand why the viewshed analysis is taking so long (nearly 124 hours) to run. I have a DEM raster file for all of Colorado which has almost 3400 features and a polyline national ...
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0answers
95 views

ArcMap 10.2 Viewshed vs ArcPy Viewshed results in different Rasters

I recently wrote a Python script that uses Esri's viewshed (arcpy.sa.Viewshed) and it seemed to work fine until I compared the output (area size) to what ArcMap's Viewshed_sa itself (which seems to ...
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1answer
100 views

Interpreting viewshed results attribute table

Using QGIS Viewshed Analysis plugin I've run an intervisibility analysis (with 5km buffer) on one point against 218 others and its produced the table below. Each of the 218 points has a unique code ...
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Creating Viewsheds in Graphic Modeler

I am trying to use Graphic Modeler to run viewsheds. As I can’t appear to use the Viewshed Analysis plugin tool in Graphic Modeler and I instead need to use the GRASS command r.viewshed. I am ...
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1answer
186 views

QGIS Graphical Modeler Add Specific files

When I create a model in the Graphical Modeler Tool I need to add layers using ‘Add File’. When I run the script, I have to add the same files each time (Which can lead to adding numerous files). ...
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1answer
118 views

ArcGIS Viewshed Outputs

I am running the Viewshed (Spatial Analyst) tool with OFFSETA and OFFSETB existing as fields in the observer feature class. See firstly the single observer point (a star) I am using with the terrain ...
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1answer
65 views

ArcGIS Unfeasible output from ViewShed Tool

I have an observer point (VP3) from which a consultant viewed bird activity on a site. See illustration of the site (blue polygon) with a colored scale of terrain height AoD in m (grey rectangles ...
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Creating Viewsheds on Mars?

I am having a hard time creating viewsheds on Mars. Originally, I thought it was a coordinate system projection error, so I created a custom projected coordinate system for Mars, went to this site, ...