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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 visible polygon form one point (visibility graph with one point)

Problem I would like to get the visibility of one point in regard to a polygon layer. E.g. which island can I see from the beach. What I found It's possible to get a visibility graph via Grass v....
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2answers
79 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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30 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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31 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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52 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
51 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
58 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
83 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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45 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
193 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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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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1answer
70 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
99 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
75 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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1answer
128 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
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
478 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
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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93 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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1answer
270 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
107 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
667 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
798 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
54 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
562 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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89 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
444 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
157 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
1k 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
230 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
243 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,...
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1answer
1k 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
481 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
78 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 ...
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1answer
245 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 ...
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0answers
363 views

ArcGIS Online layer visibility range [closed]

I am trying to change the visibility range for several layers on an ArcGIS web map - should be simple right?? This could be a case of my misunderstanding on how to use a tool or it could be a case ...
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1answer
55 views

Why might a newly created vector layer not appear on canvas?

I have just created a new vector layer (line features); used same CRS as all other layers; added new field to attribute table; and saved the new layer as new_garden_cable.shp. I then digitised one ...
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0answers
80 views

How to control layer visibility in the Map Composer Overview map? [duplicate]

I wonder if it is possible to choose which layers would be visible in the Overview Map loaded in the Map Composer. Note that this is already possible for the Overview Panel in the QGIS Desktop: for ...
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1answer
102 views

Viewshed analysis without observer point?

I want to find the most visible point within an area.. I don't have an observer point, I want to find it. based on the highest points, I've created scenarios and compare.. However there might be an ...
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0answers
78 views

How to determine Grass (i.atcorr) tool control file's “visibility for the aerosol model [km]” value

In Grass, the Atmospheric Correction tool (i.atcorr) reference do not provide information with regards to the parameter "visibility for the aerosol model [km]"stated in the control file.I have ...
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0answers
94 views

How to determine Visibility Map for Atmospheric Correction

As per Grass wiki: https://grasswiki.osgeo.org/wiki/Atmospheric_correction the atmospheric correction could be done using a visibility raster in conjunction with an elevation raster. With regards to ...
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3answers
909 views

Viewshed Analysis - use DSM or DTM?

I need to run a Viewshed analysis (ESRI 10.2 spatial analyst tool) to answer this: what areas will be able to see a proposed 30m high structure. I have the choice of a DSM or a DTM to use as the ...
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1answer
85 views

Visible altitude across a raster from a point

I have a raster surface model and I'm trying to determine the height an object would need to be at to be visible from an arbitrary point at an arbitrary altitude. I am currently using Grass and have ...
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2answers
238 views

Viewshed 2. Understanding of VAT and observer-region relationship table

I am having a hard time using new Viewshed 2. I am trying to join values from result raster with observer-region relationship table (ORRT) using Value from raster and Region from ORRT. I couldn't ...
2
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1answer
2k views

Vector layer visibility using min/maxResolution is not working in Openlayers 2

I am using OpenLayers 2 and Geoserver. I have a few WFS layers and an OpenStreetMap as a Baselayer. I want to change the vector layers' visibility at certain zoom levels, by using min/maxScale or min/...
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1answer
674 views

Checking layers with scale based visibility for visibility in QGIS

I am writing a Python method which I want the mouse click event to connect to. The method selects objects from layers that satisfy certain conditions. I want to select from any visible layer, that has ...
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1answer
67 views

Visibility analyses of two objects with ArcMap?

I'm struggling with a visibility analyses task in ArcMap. I have two objects: a spire and a WTG (wind turbine generator). Both are point features. The object's heights are deposited in the attributes ...
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1answer
290 views

ArcGIS Layer Visibility Shortcuts or Tools

I am wondering if there are ways in which we can enable the layer visibility when holding a key and turn the layer off when releasing the key (in ArcMap). Something like in some online games you can ...
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0answers
191 views

Compute isovist from OSM buildings

I'm using PostGIS with OSM table of buildings. How can I compute isovist from single location point while only the buildings (represented as geom's) are the obstacles?
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1answer
77 views

Vertical section of viewshed

How can someone make this vertical section of a viewshed analysis (e.g. in ArcMap)?