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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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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Visibility Analysis with Obstruction in ArcGIS Pro

I am trying to run a visibility analysis in ArcGIS Pro, and I am struggling to make the program register the 3D buildings as "interfering" with the line of sight. My workflow was as follows: ...
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Why does my viewshed output have more rows than observer points?

I am trying to run a viewshed analysis using viewshed 2 in ArcMap10.7.1. I have multiple observer points and a DEM as the inputs, and I am using the OBSERVERS analysis type with the ORRT as output ...
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Toggling Layer Visibility in Web Map using ArGIS API for JavaScript

I have an Esri Web Map which consists of multiple layers. In the application UI there are some checkboxes for each layer which the user can change the each layer's visibility on the map. How do I ...
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QGIS 3D symbols disappear in 3D Map View while tilting and zooming map canvas

In QGIS, I am creating a 3D Map view of point data (Phong spheres) in a mountainous area (2m DEM). It all worked fine with v3.10. After updating to v3.20 the spheres start gradually disappearing upon ...
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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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10 votes
2 answers
1k views

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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2 answers
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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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3 votes
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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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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 ...
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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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3 votes
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550 views

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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7 votes
2 answers
461 views

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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3 votes
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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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4 votes
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Difficulty with Scaled Visibility for Labels in QGIS 3.4.9

I am having great fun getting to grips with QGIS (fantastic). I have set myself a "project" to try to learn the techniques. This project refers to 2 Layers (geographic areas for Telephone Exchanges ...
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1 vote
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QGIS 3.4.2 on Windows: pyqgis 3 rule-visibility depending on scale

I have a plugin for QGIS 2.18. In QGIS 2.18 it was possible, to toggle the visibility of each of the 7 "sublayers" (see below) by python-code: symbol = QgsMarkerSymbolV2.createSimple({'name': '...
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1 vote
1 answer
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How can I calculate the maximum sky viewing angle for every point in a DEM not covered by objects? [closed]

I am looking for areas in a city that are suited for setting up precipitation measuring stations. One constraint is, that the station has to be distant from each object at least two times the object's ...
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QGIS - Visibility Analysis fails with "AttributeError: 'NoneType' object has no attribute 'GetGeoTransform' "

I'm using Visibility Analysis plugin to generate cumulative viewshed maps. The base DEM map is created using GRASS GIS (r.surf.contour). I'm running using the following setting below - but have also ...
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2 votes
1 answer
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Error installing visibility analysis plugin

When I try to download and install the latest version of the visibility analysis plugin from both https://plugins.qgis.org/plugins/ViewshedAnalysis/ and http://www.zoran-cuckovic.from.hr/QGIS-...
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Visibility analysis with mask for non visible areas?

I have LiDAR data and I've made a Digital Surface Model (DSM): I've made a visibility analysis for 3 buildings with this model: My goal is to know from where the buildings are visible, not what do ...
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2 votes
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109 views

Setting raster visibility on/off in QGIS Python API 3

I'm having a bit of a trouble migrating an algorithm from pyqgis 2 to pyqgis 3. The thing is I want to make visible and invisible a series of layers as I iterate through a list and render some images. ...
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Is it possible to do a visibility analysis and create a 3d - cone as a result in ArcGIS?

I have a digital surface model of a region and the coordinates and height of an observer point and need to do a 3d - visibility analysis for this point. However, as a result I would need a ...
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4 votes
1 answer
1k views

Layers disappearing in QGIS print composer?

I am using QGIS 2.18.26. I have problems with a layer disappearing on map in my composer. First I thought it is a scale based visibility problem, it is a layer with some rectangles and titles on ...
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1 vote
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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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2 votes
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239 views

QGIS Visibility Analysis > Depth Below Horizon error

Background: I need to conduct a visibility analysis that will calculate depths below the viewer's horizon. Process: QGIS 3.4 > Processing Toolbox > Visibility Analysis > Depth Below Horizon. Input ...
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2 votes
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Creating and populating a visibility preset with pyQGIS

I'm trying to create some layer visibility preset in QGIS 2.18 using its API. But, for some reason, when I try to add layers that are visible in legend interface, it simply doesn't work. Here is the ...
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Issue with exporting GRASS visibility graph to shapefile

I am rerunning code in GRASS that has worked in the past (about six months ago) and am now having problems. In the GUI, I have created a new mapset and imported the 'SimplifedCoastline' file to the ...
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Group scale-based visibility QGIS 3

Is it possible to set scale-based visibility for groups or sub-groups of layers in QGIS 3?
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1 vote
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Change visibility of attribute field/group of field in one layer based on checkbox or value map - QGIS

i'm using QGIS 2.18.3, in Win 7. i want to know how to make attribute field or group of fields become visible or invisible based on value of other field on picture above, i want to make my grup ...
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-1 votes
1 answer
349 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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4 votes
2 answers
448 views

ArcGIS Desktop 10.5 - Create Line of Sight not showing intermediate points

I'm new to ArcGIS and in a college course. I am trying to perform a Line of Sight analysis on a DEM raster, but it's only showing the endpoints, not the intermediate line with the visibility ...
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6 votes
2 answers
899 views

Calculating limits of visible horizon of location in QGIS?

I am an amateur at GIS. I installed QGIS Las Palmas version in Windows, I searched YouTube and also in Google but I didn't find this question. There is a website that one can input the coordinates of ...
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1 vote
1 answer
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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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Changing visibility of layers on project with OpenLayers and GeoServer?

I'm working on a proyect with openlayers and geoserver, the idea is to have a select menu where the user can choose which layer is visible, something like this <select id="format"> <...
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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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2 votes
0 answers
195 views

Figuring out whether a feature is visible or not in pyqgis

I have a vector layer (lines) with a numeric (integer) attribute, let's call it Status. This layer is styled according to the attribute using a categorized style: So far, so good. Now I'm trying to ...
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4 votes
1 answer
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creating a visibility graph on a sphere

I maintain a Python package (Pyvisgraph) that builds a visibility graph given set of simple obstacle polygons. I am using it to calculate shortest paths between two points on a map. The obstacles are ...
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1 vote
1 answer
141 views

Scale Dependant Visibility bug

QGIS 2.18.5 No matter what I do, if I set minimum visibility to 1,000,000 and max to 400,000 click apply and re-open properties, the max 'resets' itself to 100,000. Visa versa if I set min to 400,000 ...
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