9
votes
Accepted
Viewshed Analysis - use DSM or DTM?
Your choice of DSM vs DTM will depend on whether there is best-practice guidance or regulations governing the planning process for which you are performing the calculation.
For instance, Viewshed ...
- 33.7k
9
votes
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ArcGIS Viewshed Outputs
The error in your approach is that a 2m tall person at Point A who can see a 50m tall structure at Point B does not mean 50m tall person at Point A could see a 2m tall structure at Point B. Here's a ...
- 704
9
votes
Raster data viewshed analysis with Python
The easiest way to calculate a visibility raster in python is to call the ad hoc functions of a GIS from your code. This can be done in several ways (non-exhaustive list):
Using the r.viewshed module ...
- 1,509
7
votes
Accepted
ZTV Viewshed Analysis plugin in QGIS
It is very simple. Just set the target height (leaving the target points file field blank). This is the height above ground level that the observer is looking at. For inter-visibility, the target ...
- 33.7k
7
votes
Using Viewshed Graphical Modeler
You should include your DEM as an input within that model. I have reproduce your model and just add that entry, and it worked.
Here is the image of the model:
Here is a final screenshot showing ...
- 3,409
6
votes
Accepted
Viewshed analysis distance
Viewshed analysis generally only checks the theoretical line of sight - can a cell be seen from another cell, without any higher terrain standing in the way?
It doesn't take into account whether or ...
- 20.3k
6
votes
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QGIS Graphical Modeler Add Specific files
I think a custom script might be needed for this which allows you to set fixed layers and use these in your model without having to constantly specify them. You can create one from:
Processing ...
- 75.2k
6
votes
Accepted
Flight visualization in QGIS
As far as I see, the solution by @bugmenot123 does not work as intended: native Qgis 3D symbology accepts only a fixed valued for the elevation, no data driven override to use the values of an ...
- 67.1k
6
votes
Accepted
QGIS - DEM - adding height to raster
Two ways to update the target raster directly without creating a temporary raster layer:
Use gdal_rasterize https://gdal.org/programs/gdal_rasterize.html with -add option.
-add
Instead of burning a ...
- 63k
5
votes
Viewshed Analysis incorporating tree height
Your workflow will be something like this (you don't mention what software you're using but this should work with anything). Basically you just need to add your pine trees to the DEM as if they were ...
- 12.2k
5
votes
Calculating visible sky percentage?
The sky-view factor (SVF) is defined by the part of the visible sky (Ω) above a certain observation point as seen from a two-dimensional representation (see figure a). The algorithm computes the ...
- 49
5
votes
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Generate a viewshed and merge it with another image using GRASS/GDAL command line?
How about something like this:
radius=5000 # Maximum distance
X=200000 # X coordinate of lookout
Y=500000 # Y coordinate of lookout
r.import dem.tif output=elev
g.region -a rast=elev
r....
- 15.5k
4
votes
Problem creating viewshed raster in QGis - output black
Found out the solution! First, I was wrongly considering absolute heights in observer/target height. Those are offsets. So I changed them to 1.6 / 0.
Then, turns out I needed to manually assign a ...
- 401
4
votes
Error memory on Viewshed Analysis plugin QGIS
This is a classic python "out of memory" error.
I looked at the plugin code. From the stack trace, it looks like you're doing an intervisibility analysis. This makes a line feature between each pair ...
- 20.3k
4
votes
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QGIS Viewshed Analysis Colours
There's a few settings you might need to alter:
In the Load min/max values option, choose the following setting:
Min / max
Set the Accuracy option to:
Actual (slower)
Set the Interpolation option ...
- 75.2k
4
votes
Accepted
Seeking algorithm to find point on surface with highest visibility?
The whitebox GAT software has a tool that does what you need to do (I think), its called Visibility Index. From the manual:
This tool can be used to calculate the visibility of all locations within ...
- 3,868
4
votes
Accepted
Geoserver viewshed WPS not found
Out of the box GeoServer WPS does not have a viewshed process.
One can be written, or you can bridge to another software (e.g., GRASS) that can do it.
Both option require coding (so either your ...
- 17.3k
4
votes
Accepted
Seeking map provider for Viewshed Analysis
You can do that with your own DEM and offline by using gdal_viewshed https://gdal.org/programs/gdal_viewshed.html.
- 63k
4
votes
QGIS Viewshed plugin not in any menu
Visibility Analysis plugin adds the related tools to Processing Toolbox as in the image.
- 76k
4
votes
QGIS - DEM - adding height to raster
You can use Rasterize (Vector to Raster) from GDAL to turn your polygons into a raster with a specific value where those polygons are.
Make sure your vector is in the same CRS as your raster first, ...
- 73
3
votes
Accepted
Viewshed Plugin gives incorrect results
I was able to reproduce this. I've never had this problem before, as I tend to use the OS OpenTerrain dataset for mapping in the UK.
I used SRTM and the wonderful Python Elevation module to download ...
- 20.3k
3
votes
Performing viewshed analysis in R?
I believe I have found a viable solution to address my (edited) original question. At the best of my web searches, I got the impression that virtually all the packages available in R to perform ...
- 1,536
3
votes
Error installing visibility analysis plugin
There is no point to install the new version of Viewshed plugin since it is available as the boult-in plugin in the QGIS 3x.
You can find it in the processing toolbox on your right. Type in the ...
- 4,005
3
votes
Seeking map provider for Viewshed Analysis
As per @MichaelStimson I think you can do a viewshed in GEE or QGIS.
I've not used either so I can't attest to their suitability. Getting elevation data to match your accuracy requirement is ...
- 219
3
votes
Accepted
Difference and similarities between Intervisibility and Viewshed
Intervisibility can be defined as the ability to see in a direct line of sight from one position on the Earth's surface to another.
A Viewshed is defined by all the points which are visible from one ...
- 9,776
3
votes
Flight visualization in QGIS
Absolutely. You have two options, the native QGIS 3D view or the qgis2threejs plugin.
For qgis2threejs you can select a DEM as background, drape a texture on it as you like (from the canvas or a layer ...
- 10.7k
3
votes
An example for Viewshed analysis in Python
When I set creationOptions=None I was able to avoid that particular error. However, I suspect you will have a problem with mode='NORMAL as that is what I'm currently stuck on.
EDIT: From the gdal_alg....
- 31
3
votes
An example for Viewshed analysis in Python
The Python API documentation for the ViewshedGenerate algorithm is at https://gdal.org/api/python/osgeo.gdal.html#osgeo.gdal.ViewshedGenerate
osgeo.gdal.ViewshedGenerate(Band srcBand, char const * ...
- 63k
2
votes
Accepted
Automated Viewshed in QGIS
I hope it is not too late for you but this is how you can get access to Grass 7 and SAGA tools in QGIS.
NB. I am using QGIS 2.8
Ensure that SAGA, Grass 7 and msys are installed in your PC and that ...
- 256
2
votes
Viewshed Analysis - use DSM or DTM?
The Viewshed tool uses a single DEM as input. @MappaGnosis explains clearly that you must decide whether a DSM, DTM or a combination of the two is best for your input DEM.
By default, the observers ...
- 408
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