Questions tagged [visibility]
in this context visibility is intended to mean whether a real world object is visible from a point or location on a map. It is not intended to mean whether a map layer is visible when another map object is drawn on top of it.
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Get signal on layer scale based visibility changed in PyQGIS
Is it possible, to get a signal, when something (user or script) changes layer scale visibility?
I tried
layer.configChanged.connect(self.test_2)
layer.flagsChanged.connect(self.test_2)
layer....
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Calculating accurate viewsheds using DSM and DTM lidar data QGIS
I have a question regarding using DSM (Digital Surface Model) and DTM (Digital Terrain Model) data sets to create Zones of Theoretical Visibility.
I used the QGIS Visibility Analysis plugin to create ...
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Feature not showing on zoom levels, despite scale range (QGIS)
I have an MBTiles file I am editing in QGIS. I have isolated the "transportation" layer to only show roads, and I want the major roads to appear at all zoom levels:
However, these major ...
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Log Execution Failed Viewshed (line 266,351,888,163)
I found difficulties when doing viewsheed and network intervisibility. The steps I have taken are:
Download DEM from opentopograhy SRTM 30
Wrap projection DEM rasterized to UTM 84
The collection of ...
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2
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1
answer
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Turning off layer visibility in ArcGIS Pro with Python
I have code that exports several maps. For a set of maps, I want to make sure one layer used in a previous map is turned off. I don't want to remove it completely.
Anyone know what I am doing wrong?
...
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2
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1
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QGIS Visibility Analysis > Viewshed: results appears not in all directions
I am trying to analyse the visibility of a particular tower of a castle from the surrounding area. I have a Digital Surface Model (not DTM) which includes the built form (and therefore as I understand ...
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Visibility/viewshed analysis
I’m working on a viewshed analysis for an ADLS tower. Basically, I need to ensure that aircraft at various altitudes are visible to the tower. I have an ADLS tower with elevation and height values, ...
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1
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Displaying only labels of points that are visible in QGIS
I have a large point layer that I have symbology classified by att field "Property Type" then the property type field is further subclassed into "Class" (A, B, C for example).
I ...
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QGIS: Layer in layer tree list not visible
I have a new problem with QGIS 3.28.7 (OS Linux Mint 21.1):
I'm looking for a layer in the layer tree list in a QGIS project, and use for that purpose the search box (left side below) - the result I ...
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Conducting viewshed with building heights using ArcGIS Pro
I am seeking to conduct a viewshed (using ArcGIS visibility - spatial analyst) of from an observer point, which is a human standing on a hill. Once I have added the single input point, I have added 1....
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Using Viewshed or Line of Sight
I am having a hard time working out whether I should use Viewshed or Line of Sight in ArcGIS Pro. Basically I have a single observer and I want to know whether a building in the far distance was ...
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Algorithm for calculating line of sight [closed]
I've been working on implementing a Line of Sight calculation tool, but the results often appear incorrect. I am unable to use other libraries or tools to do the calculations, so please do not ...
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Calculate visibility of single point
I am looking to identify where a single point in the landscape can be seen from everywhere else in the landscape. Specifically, I want to know from where a hypothetical 34m building can be seen from ...
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Changing polygon color depending on visibility of background map in QGIS
I have a map with borders and different "background maps", e.g. OpenStreetMap and Google Satellite. When the Google Satellite Map is in the background, the borders are the best visible in ...
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Creating ArcGIS toolbox that gives minimum number of points that can observe road
I am using ArcGIS Pro.
for value in fcVertexList:
x = arcpy.sa.Viewshed(in_raster=L_34_067_BD_dted2_tif_img, in_observer_features=value)
#Raster Calculator
Visibi_raster = (...
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Changing the value of a raster cell depending on how many cells in the neighborhood have a certain value
I have an issue that feels like it should be simple but I cannot for the life of me figure it out.
In the image below I have calculated a viewshed for the selected point. What I need to do is assign a ...
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2
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430
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Hiding specific symbol layer in layouts using QGIS
Is there a way to hide a specific "symbol layer" when in the layout window?
I have a point layer where the points are marked with two "symbology layers":
symbology layer 1: single ...
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How do I perform a reverse depth below horizon study in QGIS?
Using the visibility plugin for QGIS you can calculate the depth below horizon that targets (effectively individual pixels from the supplied DEM) appear to a single observer.
I would like to perform ...
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Determine the percentage area visible within a polygon from a visibility map with ArcGIS Pro
I'm using ArcGIS Pro and have created a visibility map for a specific area where a building will be built. I have 4 polygons buffered around the building at 1km, 3km, 5km and 10km.
How do I determine ...
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How to get one seperate viewshed raster for each points that are on the same shapefile?
I have a shapefile with several points (1 of 30pts and one of 100pts), and I would like to generate a viewshed/field of vision for each point. The objective is to know, for each point, 1) the surface ...
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Markers are not showing on min resolution
Working with Openlayer 6, my map is working fine for the 40 layers on initial load. Against search functionality, I am trying to add a new layer on the map using the following code.
const ...
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Use a value from a field to control the visibility of a field another layer
I have in my project two layers, one vectorial "Enrutamiento" and another non-vectorial "Fusiones",Through the QGIS documentation I managed to establish a relation between these ...
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QGIS expression function is_layer_visible() missing in QGIS 3.28
Trying to answer another question, I remarked that the QGIS expression function is_layer_visible() is missing in my expression editor. It should normally be located in the General group. It's not ...
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Check and uncheck the child tree layers created by using a graduated renderer
My PyQGIS script creates a number of layers, including one with a Graduated symbol renderer "DE Single", which splits my line symbols into 8 ranges e.g. -150 to -105.
I have PyQGIS code to ...
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Understanding Visibility SPOT value in ArcGIS Pro
I'm in the process of performing a visibility analysis using the Visibility tool in ArcGIS Pro 3.0, but something is confusing me about the SPOT parameter. On the ArcGIS Pro website (https://pro....
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Matching observers to specific targets in Construct Sight Line using 3D Analyst with ArcMap
I am using ArcGIS Desktop 10.8 with its 3D Analyst extension.
I used the Construct Sight Line tool for 37 observation points relative to 748 target point features. I would like to match the ...
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QGIS: Point object is not displayed, then layerstyle disapperas as well
I have a windturbine displayed as a point layer with a style for visibility.
If the window doesn't show the point feature, then the style disappears as well. It would be better, if the style stays, ...
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Creating visibility surfaces through extracting and iterating with ArcPy
I am using ArcPy with ArcGIS Pro.
I am trying to create a short script in order to create visibility surfaces from a set of points and a raster surface. I am new in ArcPy and probably this piece of ...
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136
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Visibility Analysis crashes QGIS 3.22
Every time I try to perform any of the tools from the Visibility Analysis plugin QGIS crashes. I'm using the latest LTR, QGIS 3.22.4. When I click any of the options (Viewshed, Visibility Network, etc)...
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Making topographic basemap visible in layout using ArcGIS Pro
I am using ArcGIS Pro 2.8.
I have a basemap and river labels are not visible in the layout.
How do I make them visible?
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Tying visibility of features to zoom level by attribute in QGIS
I know how to make the visibility of an entire layer conditional on the zoom level.
Is there a way to do the same thing for specific features? I have a road data set, where each feature has a class ...
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How to calculate area of visibility analysis
I created visibility analysis in QGIS and I don't know how to measure visible area. How can I do this?
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ArcGIS API GraphicsLayer is not visible on map
I'm creating an onClick eventhandler to create a point on every click on the map, but the Graphics layer is not visible;
Has anyone else encountered this? Is there something special I'm supposed to do ...
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Exporting QGIS project containing many points with qgis2web: reduce loading time
What I have:
QGIS 3.18 on Win 10 containing a project with:
OpenStreetMap basemap
Point layer (Geopackage, 5.1 MB), representing centroids of buildings of a city
Point layer set to scale based ...
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gdal_viewshed's results are suffering some glitches vs visibility analysis from SAGA
I'm seeing some artifacts when using gdal_viewshed vs the ta_lighting tool from SAGA-GIS. Small differences are noticeable between both visibility results.
As I wasn't sure which one was "wrong&...
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Problem creating view points
I have to create view points in order to do a simple intervisibility analysis. However, when I run it, I get this message:
I tried fixing the geometry, as there seems to be a null geometry somewhere, ...
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Automatically create an array of all visible layer names in QGIS
How can I get an array of all visible layer names automatically using QGIS expressions? In principle it should work with the variable @map_layers. Using the following expression works fine for what I ...
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165
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How to determine the visibility of a target at a fixed height above an observer on a given DEM?
I have a DEM, an observer position and an observer height above ground. Further I have a fixed height above the observer at which a flying target is expected. I now want to determine given the DEM, ...
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MapBox Studio: Styling Water in template dataset
I am using MapBox Studio with their own template dataset called Outdoors.
I discovered that categories of waterways can be addressed by classes such as river, stream, stream_intermittent etc. This ...
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Calculate angle of view from a point based on DEM using QGIS
I'm looking for a way to calculate the angle of view from a point on a DEM, in particular from the highest point of a terrain relief (corresponding to the red dot in this image below).
To better ...
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Viewshed output does not make sense
I am trying to perform a viewshed analysis (using the visibility function), however the output only shows a very strange area for the visibility areas. It makes no sense that my point which is at a ...
user166847
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Container 'Control visibility by expression' for relations
I have two relations in a project on QGIS 3.10. They have the same field ('fid') of the parent but different fields ('topo_part';'topo_part_loc') of the same child. I want to see these relations in ...
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QGIS - make selected hidden objects visible
Selected objects in QGIS are not visible as selected (i.e. not visible with standard colour yellow) if they are covered by overlaying objects.
This is the case for objects in underlaying layers as ...
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Can't select features in saved WFS-data
I saved some features from a WFS (http://geodienste.bfn.de/wfs/schutzgebiete - the theme "Landschaftsschutzgebiete"). We did this in the past without any problems.
Now, despite the features having ...
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Why won't QGIS show markers outside the window?
I'm having an issue with the QGIS2.18.3: I have grid center points, where I want to put square shaped markers to create a grid. The problem is that if a center point is outside the window, the program ...
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996
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Checking if feature visible using PyQGIS
I am developing a QGIS plugin in python.
I need to allow the user to select multiple features of the current active layer using an extent.
I am using this code to do that:
self.iface.activeLayer()....
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QGIS 3.10 problem with viewshed plugin
Continuing the strenuous trial of generating the viewshed for the points, from
QGIS viewshed plugin returns error I am still getting an error:
Traceback (most recent call last): File
"C:/Users/...
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QGIS Attribute dependent visibility
I have a contour map which I have applied a symbology to add arrows pointing 'downslope' (defined by the average of adjacent line segment directions) by editing a linetype and adding markers.
I am ...
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Determining if layer is visible using PyQGIS
I am working on a plugin 'Stripchartdrawer' current commit https://github.com/sickel/qgisstripchart/tree/ba3afd7184e33331b5af38111e91dbb9b6a2d1c0.
One of the features in this plugin is to be able to ...
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Hiding one field of geodatabase for some users
I have ArcGIS Server 10.3 and SQL Server 2008.
I have a geodatabase which is connected to SQL Server by using ArcSDE. My users connect to the database by IP address and Username and password. I want ...
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