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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23 views

Layer tick boxes embedded in PDF map

Maybe this is more of a PDF question than a GIS question. Today, I received a layered PDF map shown as a landscape A3, with a square map on the left, and with the map title, the legend, the scale, a ...
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10 views

Creating a layer switch Google Maps Api v3

I have generated a basic webpage with Visual Studio 2012 that displays a Google Map. My goal is to add multiple KML layers from my Server onto the Google Map, BUT, i want to be able to have a sort of ...
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0answers
26 views

How to force geometry type in (WFS) layer in QGIS

I have an external WFS source serving mixed geometry types - in other words, I have no control of the source. When adding the layer QGIS sets the geometry type to line and thus I am unable to style ...
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1answer
32 views

Millions of polygons: displaying layers in Leaflet based on location being viewed?

I'm trying to create a map of all parcels in a state. In my state, this is several million parcels. In their current format, they are encoded as topojson and divided up by county. I'd like to show ...
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7 views

TileMill-style based on the country the objects belong to

Is it possible to have different TileMill stylings in different countries? I need for instance different colours for highways based on the country the highway is in. Is there a best practice solution ...
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1answer
26 views

More than one group for a single layer in Geoserver?

I have a huge number of layers in my geoserver that I have painstakingly imported and they all work correctly when viewed with GeoExplorer etc. I want to know if there is any way to create set maps ...
0
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1answer
29 views

Is there a way to display more than 10 categories in cartodb?

I'm creating a map in CartoDB. I have roughly 18 categories, but each of those has a sub-category, which is 'yes' or 'no'. Currently I am displaying the 18 categories in two different layers to get ...
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11 views

Get Web Map Layer Field Value for If/else Statement

I've been trying to read through the ArcGIS JavaScript API but can't find what I want. I have a web map on my page that is based on my my map stored on ArcGIS online. I want to create an if/else ...
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1answer
54 views

How do I programatically edit the layer 'Display Expression'

I'm wondering if someone has or knows where a tool is to edit the 'Display Expression' of a Layer, or more specifically, a TableView, in ArcGIS Desktop. I know that it can't be accessed with Python, ...
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24 views

OpenLayers Vector Features with common properties in multiple Layers

I am trying to manage features across different layers. Features are displaying weather parameters at some points on the map. Hence there is a wind layer, a temperature layer, etc. which all are ...
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46 views

Using python script to change group layers data source path

I am trying to implement the python script supplied by GetSpatial here: Python Script to change Group layers and am having some difficulties. import arcpy, datetime, os, io, sys def ...
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0answers
12 views

Adding layers with different WKIDs to ArcGIS API for Silverlight application?

In Esri Silverlight application, how can a map layer with a different WKID than the one used in the application be added? Will Esri 's Silverlight application handle the re-projection?
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1answer
27 views

How to remove ghost layer in Qgis?

I added a delimited text layer to a Qgis 2.0 project, working in Windows, but it got added wrong: It didn't appear in the list of layers on the left panel, nor did it show in the map canvas. However, ...
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12 views

Many layers from a unique KML files ? (OpenLayers)

I have a KML file generated from a server that contains many networks. I want to know if is it possible to generate one layer for each network from this single KML file ? Thank you!
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1answer
15 views

How to change the symbology on many image files within a group?

I have a group of raster images from lidar data (so a DEM). When loaded in, they all have different symbology - so their color scheme and color ramp are all different. I would like to create a group ...
0
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2answers
23 views

Trigger event on right-click

I want to, on right-click on a feature in a layer, have an action execute. I need to know 1 thing: What layer was right-clicked. Does anybody know how I can get this functionality? The API doesn't ...
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0answers
26 views

Arcscene export issue: only upper layer showing up

I have created a 3d visualization with ArcScene 10.1. I have 1 hillshade of a portion of an area, which take elevation ifno from DEM of the same area. Also, the DEM is coloured and overlayed onto the ...
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27 views

Disappearing layers in ArcScene

This is very frustrating! I have DEM hillshade layers which I have tried to change the base heights to floating surfaces. I have done this with these layers before (!) but had to change them back and ...
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1answer
60 views

Is it possible to set symbol layers always on top?

Is it possible to set symbols always on top, also if the layer with the symbol is drawn under another layer? Example: My layer order is like that: Streets (top) Buildings Landuse (bottom) The ...
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13 views

Plotting two shapefiles using R? [duplicate]

I'm not familiar with using R for GIS. I was wondering if you can help me figure out how to plot different shapefiles at the same time. I'm using the "map" function to generate a map in order to get ...
0
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1answer
68 views

Problem with snap layer when in name is space

I'm trying to make a option, where user can choose layer to snap. All is okey when layers names are without space, but if in name is space (like 'something layer name') snapping does not work. How can ...
0
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1answer
50 views

Programmatically set layer properties Python Init function

Is it possible to set the layer properties Python Init function field programmatically? I've been looking through the qgis 2.2 api but can't seem to find anything on it. Hint, suggestions and ...
3
votes
1answer
66 views

Is there a way to know if an error occurred while loading a WMS layer, in OpenLayers 2?

First of all, I already asked this question in stackoverflow. I don't want to spam by asking again here. But I think the question fits better in gis.stackexchange. I am sorry for the replication. Feel ...
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1answer
33 views

Selecting Features in ArcGIS based on their relation other layers

I am extremely new to GIS mapping and I'm trying to do what I believe would be relatively simple. I have two layers: one contains data on school locations in Chicago and the other contains data on ...
0
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1answer
16 views

Using QGIS, how can I create attributes within a polygon layer based from a selection in that layer?

I'd like to add a column, or attribute rather, to selected rows within a polygon layer. I would simply like to make a binary system, where those that are selected receive a "1,' let's say, and all ...
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0answers
15 views

Geoserver layer rotation problem

I have a mapping system setup with PostGIS, Geoserver 2.4.1 and OpenLayers 2.12 I am trying to use the geoserver vendor specific parameter "angle" to rotate a layer, and it seems to work fine. ...
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74 views

Clipping multiple layers in QGIS 2.2

I have huge amounts of data (multiple country-wide shapefiles) which i have to work with constantly. But working on separate cases i only need a fraction of that data (region, city etc.) Loading the ...
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2answers
99 views

How to clip a lines vector layer to a polygon layer in QGIS?

I've perused through previous questions and haven't been able to find an appropriate solution to my problem yet, so I wanted to post here. I have a lines layer (a contour map of mean annual ...
0
votes
1answer
32 views

Running Erdas command in MS-DOS

I have generated the following command line in ERDAS, and want to run it in MS-DOS. Getting an error- "system cannot find the path specified". I have checked the path by opening it in windows ...
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1answer
101 views

How can I export a list of an mxd's content (layers names) into a table or a pdf?

I am using Arcgis 10.2. I have created a set of mxd from which I need a list of the layers and their characteristics (Name, sources, symbologie - maybe as in legend, if there is an Definiton Query, ...
3
votes
1answer
54 views

what dictates the drawing order of overlapping features with in the same layer/feature class in ArcGIS?

I know that in ArcGIS drawing order is controlled by layers, and if I want to make some features be drawn on top of other features I can use definition queries to separate them into different layers ...
2
votes
1answer
86 views

Why is shapefile not drawing in expected location after (or before) using Define Projection tool? [duplicate]

I have downloaded this zipped shapefile of bus routes from the City of Houston data portal. I then performed these steps in ArcGIS Desktop 9.3.1: Extracted the shapefile from the *.zip Added this ...
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0answers
15 views

Statistics on matching point layers ignoring nodata values in QGIS

I have a large area and a street crossing this area. Both are vector point layers in QGIS. The large area contains -99 as NoData value. I already created the intersection of both as a new layer. I ...
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2answers
51 views

Open mail client when clicking feature in Attribute Table

One of the attributes/features of my layer contains an email address. I'd like to be able to open the default mail client by clicking on the mail address from the Attribute Table. After some initial ...
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vote
2answers
79 views

How can I create a pdf map at a high resolution while still keeping the file size manageable?

I have numerous layers in shapefile format that contain a lot of data across a large area. I am trying to create a .pdf file that shows all of the area and I want it to be in good quality, so that ...
1
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1answer
44 views

Overlap or intersect two choropleth [closed]

I have two choropleth of the same area but with different concentration data and I need to overlap them. My aim is to highlight the areas of intersection between the points with the highest ...
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0answers
29 views

I want to make a table that displays shapefile information

I have a parcel I'm working with that has multiple layers laid over it. I'd like to make a table that displays various attributes of those different layers. For example, within that shapefile, I'd ...
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0answers
34 views

Alternative satellite and hybrid layers for Europe published on WMS

For an application I am building I require to show satellite (high resolution) and street view layers, preferably also a hybrid view. Unfortunately, due to the application not running on a typical ...
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1answer
80 views

QGIS 2.2 - expression string builder to ignore NULL values

Simply put, I would like to create a rule-based filter whereby you add 2 columns together and you get a certain colour as a result. However, some fields in Column_1 may be NULL and those exact same ...
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0answers
40 views

How to intersect more than 2 layers in QGIS

I have a dozen layers, some intersecting with others. Using the Intersect tool only allows 2 layers at a time but can you add extra layers to find where it intersects? Even if it's 3 layers as shown ...
0
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1answer
42 views

ArcPy - Add Layer from Cursor Selection

I am trying to add layers from the fields of a reference layer using select by location and a cursor. Also, want to prompt the user with a message box asking if they want to add the selected by ...
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0answers
18 views

Layer offset issue in QGIS 2.0.1

I have two loaded WMS layer and want to change their position relative to each other. First, I tried to use Layer class and write some kind of plugin, but I can't find any method that allow to change ...
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0answers
13 views

Can QGIS2 refresh layers without the need to reclassify each layer individually?

I have a set of layers which I'd like to have refreshed each time I open QGIS2.2.0 (Windows 7). Each of 14 layers (polygons) is linked via a join to a csv file with no geometry. The layer displays a ...
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0answers
22 views

In QGIS Process Modeller, is it possible to automatically run a function on several layers without listing all combinations?

Trying to develop a Model which includes finding any intersections between layers and then merging them all into a single layer. I have 12 layers in total, it's not really efficient to list all the ...
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0answers
15 views

Can a joined-layer have its attribute changed depending on what layers are selected/deselected?

Using QGIS, I have a polygon-grid layer which covers everything, Layer_All joined with 2 other grid layers: Layer_1 and Layer_2, both of which intersect at various points. I would like Layer_All to ...
2
votes
1answer
34 views

Restrict WMSLayer (not map) extent with ArcGIS JavaScript API

Is there a way to restrict the rendering of a WMSLayer to a specified extent without restricting map panning and zooming? That is, I need the client to be able to pan outside the limits of the ...
3
votes
1answer
154 views

Leaflet add and remove legends with layer selection

I'm new to Leaflet/Javascript and have been struggling to get legends a map to show only when a specific layer is selected from the layer control. I have three layers, one of which I would like to ...
1
vote
1answer
129 views

QGIS/PostGIS layer styles

I've made a plugin asking for login credentials to a DB. Once logged in, the plugin is loading some layers from the DB. In the DB there are both admin and "normal" users. I've saved two styles to the ...
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1answer
48 views

Displaying QGIS layer after loading with Python

I'm successfully loading several layers with Python, but can only get to see them in the map window if I manually zoom to extent afterwards. Once the last layer is loaded I call zoom to extent in the ...
0
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1answer
62 views

Layer relations via Python

Is it possible to, through Python, to create the relations that it's possible to create in Layers/Properties/Fields/Relations, and if so how? I first thought these were saved in the styles, but that ...