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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1answer
29 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 ...
3
votes
1answer
66 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 ...
0
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1answer
2k views

toggle visibility of a Layer in Openlayers 3(!) with a Checkbox

I have some vector layers on top of a tiled layer and a checkbox for each vector layer. I want a layer to be visible if its checkbox is checked and vanish if it gets unchecked. I tried to call a ...
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0answers
11 views

Corresponding OBS fields in attribute table to input observer points (visibility, arcmap 10.2.2)

In ArcMap 10.2 I calculated visibility from 3 observer points spaced only 20-30m apart. I am after the quantities in the attribute table of raster cells that can see all 3, only 2, and only 1 of ...
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1answer
38 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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5answers
1k views

Calculating visible sky percentage?

Can anyone explain, as simply as possible, how to calculate the visible sky percentage? I have done a satellite survey and have worked out the height of buildings and the distance between them. ...
3
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0answers
63 views

ArcGIS Online layer visibility range

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 ...
-1
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1answer
38 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 ...
1
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0answers
15 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 ...
1
vote
1answer
55 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 ...
4
votes
1answer
3k views

Layer visibility using maxscale minscale not working

I'm using Openlayer and Geoserver. I have a series of layers that have a scale parameter like: 1:50000-1:25000 where 50000 is the max scale while 25000 is the minscale. I have a map like in this ...
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1answer
302 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/...
4
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0answers
88 views

Incomplete Visibility Product [closed]

I am running ArcMap 10.2 and have been trying to complete a fairly large viewshed analysis and have chosen to use the visibility tool in order to be able to produce an optional above-ground-level (AGL)...
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0answers
39 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 ...
2
votes
0answers
42 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 ...
2
votes
3answers
302 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 ...
5
votes
2answers
4k views

Viewsheds and Observer Points in ArcGIS Spatial analyst

I am trying to understand the viewshed and observer points tool in spatial analyst. I want to show which areas of land can see a wind turbine, or put another way, from where can the wind turbine be ...
0
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2answers
85 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 ...
3
votes
1answer
44 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 ...
0
votes
0answers
66 views

Code implementations for Isovist, visibility [not build in tools in ArcGIS]

I'm looking for things similar to this: http://www.visilibity.org/ This is Open Source C++ library for Isovist & visibility computations. Similar code exist for example inside ArcGis and other ...
0
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0answers
46 views

Grids stay visible in QGIS Composer Legend when turned off in project

I am using QGIS 2.8 to create a template for a dataset library. Lots of layers - vector and grids. The grids stay visible in the legend even when turned off in the map. I am using the "Filter Legend ...
1
vote
1answer
224 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 ...
1
vote
1answer
45 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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0answers
34 views

PosGIS: Longest line connecting point to line

I have a point and around it lines and polygons in the rule of obstacles. I want to connect the point to each of the lines, with a line, such that this connecting line is not intersect any obstacle (...
1
vote
1answer
79 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 ...
1
vote
0answers
51 views

PostGIS: Compute isovist

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

Vertical section of viewshed

How can someone make this vertical section of a viewshed analysis (e.g. in ArcMap)?
0
votes
1answer
33 views

Extracting Table data from Raster created by iterated visibility test

I would like to run a visibility test using the observer function on each of 500 random points in a region, and end up, ultimately with a table showing the visible area results (count cell for each ...
0
votes
1answer
38 views

Is there a way to hide certain values in a layer on ArcPad 10.0?

My organization uses Arcpad 10 on a trimble nomad. We have many data points in an environmental survey layer, but I would like to only display points from the last two years on Arcpad to help add ...
2
votes
0answers
42 views

How can I manipulate the number of points visible according to scale?

I've gotten trillions of points extracted from a DEM and they are to be labelled. It's fine at scales such as 1:500 but it gets too cluttered especially if I need to make maps of this with scales up ...
4
votes
2answers
311 views

Calculating the visibility of an observer walking a line transect

I was wondering if anyone can help. I'm want to calculate the visibility for an observer doing a bird survey by walking 1km transects broken up into 200m sections. I want to calculate the visibility ...
1
vote
0answers
67 views

ArcGIS Viewshed's show no visibility to south east

I'm using ArcGIS 10.2.2. I've been running some viewsheds using DTM files from EDINA Digimap and data that I've imported using .csv files. These files only contain the X Y details and a code for each ...
2
votes
0answers
81 views

Background (sky/terrain) of a viewshed

Is it possible to determine whether a point feature of a particular height would be backed by sky or by terrain? I've done the viewsheed analysis of a wind turbine. Now I would like to make a raster ...
5
votes
5answers
3k views

Problem in multiple dataframe visibility in arcgis 10

I have added four dataframes on singe canvas. Within Arc environment everything works perfectly but when I export the map to .eps or .pdf or .jpeg two of them are working properly while the other two ...
2
votes
0answers
274 views

How to write script for Line of sight and Viewshed analysis in Global Mapper

I wanted to write script in Global Mapper for Line of Sight and Viewshed analysis. I tried to calculate using Viewshed and Global Mapper Tools but the issue I am facing is that analysis is user ...
1
vote
3answers
331 views

Calculate Number Of Pixels Visible From Pixel

I am looking for a way in which to take an input DEM and create an output raster whose pixel's value is the count of pixels "visible" from that location. I use ArcGIS with Spatial Analyst, but also ...
0
votes
0answers
46 views

How to perform Visibility Analysis using QGIS? [duplicate]

How can I calculate Visibility using QGIS? I have not found any suitable plugins for QGIS to do this.
4
votes
1answer
200 views

What's the best way to run a visibility analysis in PostGIS 2?

I am looking for the best way to run a visibility analysis in PostGis 2, i.e. given 2 points and obstacle polygons, are these 2 points visible from each other ? I did not find anything relevant for ...
0
votes
0answers
129 views

How to calculate visible sky percentage [duplicate]

Possible Duplicate: How to calculate the visible sky percentage i have done a sattelite survey and have worked out the height of buildings and the distance between them how do i use that data ...