Questions tagged [layers]

A layer is a collection of information. It contains specific elements of a gis in a specific presentation method (e.g raster or vector layer). Layers can be edited separately in order to create individual toppics for a map.

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420 views

Creating subset of borders in QGIS?

I am using the VG250 dataset from http://www.geodatenzentrum.de. I am trying to create a new layer that contains only the borders of four federal states that are next to each other. I want the new ...
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219 views

Two CQL Filter not working on a layer

I have wms layers like: LAYERS=layer1,layer2&CQL_FILTER=(type=10);INCLUDE it works fine but when I add another filter with 'and' operator to layer 1 it does not show on map. I am adding second ...
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53 views

Problem with style with svg file for linear layer

I have a problem with styling line with svg file. Line should be style with image like below: but on layer it looks like this: My style is: <?xml version="1.0" encoding="UTF-8"?> <...
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45 views

Extracting a single grid from a mdb file?

I'm trying to open ISRIC-WISE derived soil properties (available as MDB file from http://www.isric.org/data/) as a layer in ArcMap without much success. I know MDB are MS Access files that can be read ...
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108 views

I can't load layer into qthread object in QGIS

Below, I show you an extract of the code to load a layer using threads, following the instructions shown here: Snorfalorpagus But the layer does not load, or it loads but it is not shown, and the ...
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103 views

Is there any way or shortcut to reorder QGIS layers without the mouse?

Is there any way or shortcut to reorder QGIS layers without the mouse? I'm having problems with a remote machine where the drag and drop mouse method does not work.
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283 views

Adding “monitor” layer with Access Database and coordinates x/y in QGIS?

I want to add a Microsoft Access "mdb" or "accdb" as vector layer. The layer should work all the time with current updated data from the Access file. This function allready exist for a txt(!) file: ...
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713 views

Adding Map templates to Layout View in ArcGIS Desktop?

I have installed ArcGIS 10.3 (on Windows 7 Pro) for desktop and it works very well. There is only e little problems: when I go to "layout view" and open "select template", the windows that appears don'...
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59 views

Problems opening vector layers after shifting the location of the saved layer

At work, we have recently changed from MapInfo to QGIS and our operating system from Windows to Ubuntu. We run 4 computers each with its own copy of QGIS, all connected to a server. The following are ...
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314 views

Rotate a Leaflet FeatureGroup with finger touch

I have some rectangles that I store in a leaflet FeatureGroup. Currently, if I define the FeatureGroup, it appears parallely to the screen. I would like to only rotate this FeatureGroup on top of the ...
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139 views

Remove/hide selected layer and display new layer after click on button

I´m trying to create two drop-down lists: <select id= "select1"> <option value="layer1">layer 1</option> <...
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127 views

Python Script to saves as Raster Img with new CRS, Map View Extent, and x,y Resolution

I am currently trying to write a python script that can do the same thing as when you right-click on a raster image and click save as. So I am still figuring out how to change the CRS for the raster ...
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35 views

Won't edit field properly

I have a shapefile with one layer. I want to create another layer, copy all the features from this layer to the new one, and then delete the first layer. I should say that the new layer has also one ...
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56 views

Using Carto.js with video and multiple layers

I've got a script which works fine for the base layer (green dots - not all work, but that's my issue!), but cannot see how to get the next layer to play the relevant YouTube video. I can't find a ...
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381 views

How to change layers in OpenLayers 3 with radio buttons?

I work on my map with more layers as source, I use inputs to set source layer. I need to change layer value. I have inputs type radio : <input type="radio" id="1" name="4"> <input type="...
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95 views

Using ArcPy to add all unique values from TIFs

I am looking for a way to use ArcPy to add all unique values to a layer. My tool converts ASC files to TIF files and then adds the layers to my mxd. All works well: I have created layer files to ...
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11 views

Moving nodes of different multipolygon on different layers

I would like to import into Openstreetmap the land-use data. In order to do a good job, I would like to correct some imperfections before the import. Take a look at this screenshot (which is a small ...
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595 views

Leaflet map with 'query of features' on mouseover and multiple layers

I have produced two working Leaflet maps that in total contain the features that I need for my application. However, I cannot solve how to have multiple 'overlay' layers that can be queried with ...
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40 views

Maximum likelihood classification- changing class colour with every layer

I created a signature file, where I defined 4 different classes, which I named and coloured specifically. When I try to use the maximum likelihood classification tool for other layers, the classes ...
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101 views

Problem in layer overlapping (qgis)

I want to plot gps pts on qgis (version 2.14.1). I have added the vector layer of SE Asian countries, and added the delimited text layer of my gps pts which included species name, lat and lon. ...
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44 views

QGIS Composer keep reference after reloading layers

I have written a plugin which loads a bunch of geojson data via REST for a specific region, which is selected by the user, afterwards generates some vector grids over the extend and styles all the ...
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198 views

arcpy symbologyType is always OTHER, but I need UNIQUE_VALUES

I am trying to load a TIF file to the mxd using arcpy, then add a definition file to map colouring. For one layer I have the problem, that the amount of values will always be different, sometimes it ...
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106 views

Android WebMap Popup Viewing not showing my layer info

I used the code for WebMap Popup Viewing from ArcGIS for Developers (https://developers.arcgis.com/android/sample-code/webmap-popup-viewing/) and I just changed the map URL with a map I created and ...
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130 views

First click layer selector doesn't work in CartoDB?

I'm working on an interactive map using CartoDB built of Leaflet.js. I added a layer selector which works fine after the first click. The first click just doesn't work, if I click the selected layer (...
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510 views

How to align with QGIS two layers that have the same projection?

I am using QGIS 2.12.0 to create forest maps. I usually succeed to create maps from shapefiles with different projections but for some reason I cannot succeed to align the layer of one shapefile. As ...
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1answer
341 views

Order of coordinates for extent property in layer Tile?

I was just going through the documentation for OpenLayers 3.11 and came across Tile(). Now it accepts a lot of properties: opacity, preload , map, etc.), but the one I am interested in is extent. ...
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44 views

Point and Polygon Data refusing to display: corrupt data?

I have two sets of shapefiles, one point data and one polygon data. Both were sent as part of a bigger set of data. Neither the point or polygon data will display when loaded into QGIS. The raw data ...
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289 views

QGIS KML layer won't show up in Google Maps API

I've trimmed US Census shapefile data to show census blocks in just three states, by editing the attribute table. I then color coded the states based on values in the table by changing the style in ...
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64 views

How does qgis render vector layer on screen ? How can I do the same in a mobile device

Can you please tell me how does qgis software render the vector layers on the screen. I have a geojson file and I need to map its contents on the screen just like qgis does but without using base map ...
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134 views

About performance of qgis with big layer or a lot of layer

does anyone has a feedback on the performance of a big layer by exemple : I have a layer with 100 features, each feature contains specifics attributes with dynamic data, the data change each second ...
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92 views

How to SetVisible a layer without redraw all the mapcanvas

I am working with QGis 2.8.2 API c++/ QT 4.5 I am displaying a lot of layer in a mapcanvas, I am looking for a method like setVisible(boolean ) in order to setvisible or not a specify layer ...
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122 views

VectorLayer still empty even if attribute has been set with value

I am working with the QGIS API C++ 2.8.2, my application is written in QT 4.5.3 / C++ I had to create a VectorLayer in memory with attributes and features and export it to a shapefile to import it in ...
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396 views

Make “qgis:delaunaytriangulation” and “qgis:dissolve” save their outputs on a specific predefined layer

I'm new to python and QGIS. I'm working on modifying a plugin which runs algorithms "qgis:delaunaytriangulation" and "qgis:dissolve" like so delone_triangles = processing.runalg("qgis:...
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180 views

Making feature layer selectable in ArcObjects Java without getting AutomationException 0x80004005?

I am currently making a FeatureLayer from a resultset. The feature layer seems to work properly and will display on the map. However when I choose "select all" on my feature layer I get the ...
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50 views

Toggle layers on print composition

I want to use QGIS to make several views of bold colors for one same map. I've been using the layers in order to keep one on top of another. How could i make a composition on the print composition ...
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118 views

C++ QGIS Conditional Label Colouring

I am using QGIS and C++. When I create a layer of polygons with labels in the center I am able to use a RuleBasedRenderer to control the background colour of the polygon. How do I similarly control ...
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199 views

Update shapefile name with layer name

I had a layer that I split by fields. The resulting files were given a name. I updated the names of the resulting layers in QGIS but have realized that the shapefiles have not been updated accordingly....
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60 views

Generate layers based on feature values

First of all, I am very new to the GIS world, so bear with me if the question is stupid. I am using ArcGIS and here's what I try to accomplish: I have a feature class (let's call it Areas) storing ...
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140 views

Adding layer to MXD from different SDE slows down ArcPy script

My python script looks at layers in an MXD, then does a couple of clip and measure operations and generates a PDF. It works accurately and quickly (0.5-3 seconds) when all the layers in the MXD are ...
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39 views

How to add on click information on places in any layers in OpenGeo Suit 4.5?

I recently installed OpenGeoSuite 4.5 and I am very new in to it. I uploaded my .shp file in it and it showing that layer currently. Now I want to add some information(name and a little info etc) of ...
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268 views

GIS system for displaying GDSII(*.gds) format?

I want to display vector graphics on raster graphics and I have vector scheme in GDSII format. There are some viewers for GDSII like KLayout for example, but they don't support raster graphics. Is ...
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235 views

Layers are not visible after restarting GeoServer

I have ArcSDE connection on GeoServer. In order to make GeoServer faster I have restarted it. After restarting my published layers (datas) are not visible. When I publish this layer again, GeoServer ...
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129 views

Multiple Layers in Geoserver

I have a problem with Geoserver with multiple layers. At the moment the idea is to print a map of Europe, then paint 3 layers on top of this to get 3 different values matches up in a polygon. However ...
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898 views

leaflet layer control checkbox options min/max

I have a straight forward leaflet map that is on a webpage. I am using the angular-leaflet-directive and all works as expected except for the layer control box. When only one baselayer is specified I ...
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183 views

QGIS cannot open layer properties

I'm trying to open (vector) layer properties in QGIS 2.2.0 and 2.4.0 (Windows 8.1) and nothing is happening. The application freezes and not responding at all (requires cntrl+alt+delete to close). I ...
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327 views

ArcGIS SDK for .Net (used in WPF): update map's zoom parameters after changing base layer

I'm having the following issue: Suppose I have a Map object and 2 base layers (a world map and a street map). A world map doesn't let us view the map too closely. The street map allows us to view as ...
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788 views

How to enable Map Tip display text in qgis and qgiscloud?

I'm using the free version of qgiscloud and qgis 2.4. I noticed that if I'll use the HTML option in "Map Tip display text", the map in qgiscloud will only show the title of the layer when I hover/...
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67 views

arcgis flex api turn on/off group layers

I just started using ArcGIS API for Flex. In my case I need to provide a widget to turn on and off several layers together, which means these layers need to be turned on together or turned off ...
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190 views

How to configure a write only layer on Geoserver?

This is probably a wrong way of doing it, but I was exploring this option only because I do not know how to implement the right solution. We have a layer to which features are added using WFS-T. We ...
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47 views

Proper updating of new memory layer geometry?

Current workflow for a toolbar button: -create memory layer -save memory layer to shapefile Then the user uses the built-in QGIS tools to add geometry and finally saves changes via the auto prompt (...