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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19 views

How to assess the visibility of a feature from anywhere on the landscape (DEM)

I'm wanting to assess the visibility of a feature of a given height from anywhere on the surrounding landscape. It seems like the viewshed tools wont work for this since they show the visibility of ...
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18 views

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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22 views

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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49 views

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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1answer
121 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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20 views

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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1answer
22 views

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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152 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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254 views

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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1answer
46 views

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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144 views

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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24 views

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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1answer
186 views

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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1answer
107 views

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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1answer
43 views

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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135 views

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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1answer
93 views

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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111 views

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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75 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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63 views

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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1answer
441 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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1answer
104 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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1answer
187 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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1answer
122 views

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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2answers
140 views

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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1answer
499 views

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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1answer
263 views

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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1answer
233 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
266 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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2answers
423 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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1answer
71 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
1k views

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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1answer
132 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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0answers
161 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 ...
4
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1answer
369 views

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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1answer
135 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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2answers
1k views

Creating a map highlighting areas of potential visibility of a high structure

The end goal is to add a point which will represent a mast/pylon of x height and for QGIS to generate polygons for the surrounding area which will have direct visibility of the top of the structure ...
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1answer
1k views

Exported files from GeoTracker (kml,kmz.gpx) are not visible after certain zoom in QGIS

I have problem with track recorded with GeoTracker on my Android. Exported track, either in any of given formats: gpx, kml or kmz, is not visible after certain zoom level - scale 1:6.141 (I am using ...
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1answer
58 views

Changing layer symbol across multiple scales in ArcMap?

I have some Cycling paths as line features, and I need to adjust the line visibility. When zoomed 1-1000 I need to see all lines. When zoomed 1000+ I need to see only red lines. Of course not only ...
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1answer
721 views

Scale-dependent displaying of a layer using OpenLayers plugin?

When I am creating a layer in QGIS the layer position/lines does not stay the same when I zoom in closer than, it seems like 1: 1000. I am adding 2 images to explain the problem. The moment I zoom in ...
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115 views

How can I analyse the visibility of the urban area in ArcMap? [closed]

I want to analyse the visibility of the urban area using ArcMap. I saw the image below and I want to have the same output. Can you explain the process and steps to obtain this output?
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1answer
699 views

How can I create the visible horizon from a point?

I'm trying to do shading analysis as part of a building energy simulation and for this I need to find the horizon as seen from the highest part of my building of interest. I have the MasterMaps ...
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0answers
196 views

Intervisibility tool does not consider the obstruction in ArcGIS [closed]

I have a 3D point outside a building as shown in the figure. I utilized the Construct Sight Lines tool to generate lines between the point and points which represent the vertices of the building. ...
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2answers
3k views

Limit Zoom Levels in ArcGIS Online WebMap

I am adding a feature class to a WebMap that I am then incorporating into a WebApp using WebApp Builder for ArcGIS. I have set the visibility scale on my feature class as I would like it. When ...
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1answer
317 views

Viewshed analysis with mutliple observers in ArcGIS Modelbuilder

I want to perform a viewshed analysis using multiple obeservation points. Each observation point has an observer height of 1.7 m and a buffer visibility distance of 5 km. In order to generate a buffer ...
3
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1answer
361 views

Viewshed analysis distance [closed]

If you were to make viewshed analysis for a point in the landscape and whether you can see a smoke in the distance, what would be the total area that you would calculate? 20 km from the observer point,...
4
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1answer
2k views

How to turn off geojson layers in Leaflet when the site starts?

I have a problem with my geojson layers. When I lunch my site they are all switched on, but I don't want to. Is there any solution to have lunched only one layer when my site starts, not the all one? ...
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1answer
719 views

Button to turn off all layers in ToC at once?

I have created a map that has a Table of Content that i use to turn on and off desired layers. Is there a way to create a 'Clear' button that will untoggle the selected layers? I have a clear button ...
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1answer
87 views

QGIS 2.81. Why can i only see my whole polygon and nothing if i zoom in

I have a polygon layer with one object. It is a flood inundation map. I could see my layer all the time in every scale factor. From one moment to the other it changed and know it is only visible if i ...
3
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1answer
284 views

Calculate visibility with polygonal visual barriers

I have the raster file for my digitial elevation model as well as a polygon shapefile with polygons representing different kinds of environments (forest, field, meadow, etc), and wouldlike to ...