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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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 ...
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1answer
90 views

QGIS Quickly switching overlapping raster images

I'm new to QGIS, and haven't used arcGIS in about 5 years, however I've just seen someone using arcGIS and was able to quickly switch between overlapping rasters when checking registration. The top ...
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1answer
399 views

Adding multiple layers in CartoDB using createLayer() not working

Using CartoDB (cartodb.js 3.5.02), it seems like you should be able to add multiple, independent tile layers to an instantiated Google Map. I've tried using createLayer() a number of ways, using both ...
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1answer
224 views

How to convert shapefile to KML file using ArcPy? [duplicate]

Python script that checks to see if a specific layer file exists in the current workspace and, if it does, converts the layer file to a KML file. Does it work with a shapefile? Code so far: for file ...
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1answer
81 views

ESRI ArcMap Topology rules on multi story buildings

I would like to run some topology rules to find snapping errors in our polygons but I am running in to the problem where we are working on multi story buildings with every polygon regardless of floor ...
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2answers
349 views

OpenLayers: WMS layer above select-controlled vector layer?

Is it possible to display an image layer (WMS or Image) above a vector layer with activated SelectFeature control in OpenLayers? The image layer (radar returns) contains only sparse, semi-transparent ...
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1answer
87 views

Differences between Arc 10.0 and Arc 10.1 Layer files

We have a program that cannot import Layerfiles from 10.1, but instead changes them to 10.0 layer files. I'm wondering if there is any Layer functionality that is lost in this transition. Right now ...
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1answer
122 views

How to sum the values for bins with the same location?

I have two maps in csv form, each has a latitude, longitude, and value column. Since not all the positions in one map are in another map, is there any way in QGIS to display a new map which only shows ...
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1answer
435 views

Creating a layer after using SelectLayerByAttribute_management

Is it possible to use an existent layer to do a selection by attributes without having to use MakeFeatureLayer_management first? Because I already have a layer with the same name as the feature class ...
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1answer
68 views

How to copy a layer in TileMill?

I've been learning to use TileMill, and I want to be able to copy a layer. I especially want to copy layers connecting to an SQLite or PostGIS database in order to avoid having to type in multiple ...
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1answer
105 views

QGIS Layers Not Lining Up

I am new to QGIS, I have been using ArcGIS for most of my maps. I have two layers that are not overlapping properly. One is a shp file from a GIS clearinghouse and another from a delimited text ...
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1answer
120 views

What ArcGIS Online feature layer can I use to display European states with unique country codes?

I'm writing a web page to display ECB statistics on an ArcGIS JavaScript API-based web map. I'm a bit lost when selecting a feature layer so that I can use the UniqueValueRenderer to make the states ...
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1answer
993 views

Openlayers Vector Feature Popup

im trying to create a popup in Openlayers that would open when someone clicks a marker. And the marker is setup like this: new OpenLayers.Feature.Vector() and not with the ordinary marker layer. The ...
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1answer
400 views

Unable to see the featureLayer but it is present on the map

I have created a featureLayer from featureCollection and I am able to add it to the map and when I execute, map.graphicsLayerIds, it also returns the id of the featureLayer, ["resultLayer"]. But I am ...
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1answer
1k views

Adding layers using ArcGISDynamicMapServiceLayer

I am right now adding individual layers using FeatureLayer but it takes quite some time to load as the map is for US Counties (3076 count). I tried to load it using ArcGISDynamicMapServiceLayer but I ...
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2answers
700 views

How to overlay points from MySQL served by Geoserver on an Openlayers map?

This might be a very basic question as I am new to GeoServer. What I am trying to do: I have a MySQL table that stores data attached to a spatial point and have latitude and longitude columns to ...
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1answer
939 views

How to overlay roads layer on top of all layers in OpenLayers?

I want to put roads layer (from any source, please recommend some..) on top of my KML polygons and base layer: baseLayer = new OpenLayers.Layer.WMS("OpenLayers WMS", ...
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1answer
140 views

Symbology for specific values

I want to apply a symbology scheme for the final layer of my model. Rules are - All negative - Symbol A 0 - Symbol B All positive symbol C unknown - symbol D I am not sure how I can define these ...
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1answer
484 views

Why my 'add basemap' data seems taking too long to upload the maps in ArcGIS? [closed]

Can i know the easiest way or any other way to upload Big maps hybrid from add basemap in ARcGIS 10? because it seems taking quite a long time to upload the map like around more than 1 hour and still ...
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1answer
77 views

Layer use too big for the coordinate in GE

I've got a problem here. I already changed the format from Tab file into Shp file using MapInfo suggested by friends here. My question is, after we set all the layer into the right coordinates, even ...
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2answers
127 views

Fetching field values from uncommitted features on Qgis

I'm trying to fetch a feature's field value on Qgis, I use QgsFeature.attributeMap().value(cont int & key).toDouble() This works fine for committed features but it always returns " 0 " if the ...
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2answers
513 views

Its possible to catch ServiceException in Openlayers?

Im trying to catch exception in OpenLayers using vector layers in conjunction with http protocol, its possible to intercept an ServiceException from geoserver ... it will be great to display some ...
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2answers
219 views

Add record in related table ArcPad

i have a layer form (named form_layer) containing a combobox and allows to add records into the related table, by showing a form of the related table (named form_table) When i try to add record ...
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1answer
2k views

OpenLayers - How to display selected features as graphic markers?

I'm attempting to render a point feature as a graphic. When that feature is selected I'd like to display a green indicator above the graphic. It seems backgroundGraphic and externalGraphic are ...
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1answer
281 views

need to show multiple symbols for one point

I am working on a state map of parks with campsites. I want to show symbols for handicap access, tent camping, backpack camping, winter camping, rv camping. I have used a symbol for handicap but it ...
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1answer
1k views

Adding time enabled layers to ArcGIS online

I am trying to add time enabled layers into ArcGIS online. The information in the ArcGIS resource center makes it sound like it is possible to add time enabled layers from ArcMap to ArcGIS online. I ...
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1answer
38 views

Creating New Layer After Sorting Attribute Table using QGIS?

I have been self-teaching myself some open source GIS. I downloaded QGIS and have been following this four part tutorial - ...
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21 views

How do I change the order layers are displayed in in MMQGIS?

I am dealing with hundreds of different layers, all of which have one of 6 names - not by choice, that's just the way they show up when I import them. I am trying to merge all those with the same ...
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29 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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9 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
27 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 ...
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13 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
20 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 ...
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28 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
47 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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37 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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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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1answer
49 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 ...
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36 views

Changing the symbology of layer when converting from Layer to KML using Python

Is it possible to change the symbology of a layer file using Python? I have a script that creates a layer file and converts it to kml, but every time I run it the symbology color in the kml of the ...
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0answers
97 views

Part of text missing in legend and text boxes

I have had issues lately when exporting to pdf from ArcMap 10.2. Parts of the text sometimes fall off and goes missing. Mostly it's been some lines in legends, but now also text boxes. The text is ...
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2answers
88 views

Using Qt Designer to Create a Form in QGIS that can search for a specific point in a layer

Good Day! I would like to ask if you can create a form in Qt Designer to create a form that can search for a point on the map using data that the user will provide such as the Name. I am currently ...
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2answers
107 views

How to avoid “Handle bad layers” message when using QGIS Flowmapper plugin?

In QGIS, if I close a project and try to open it a few days later I often get a message that says "Handle bad layers". This is very frustrating because when I open the project various layers will have ...
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1answer
80 views

ArcPad VBscript restrict layer editing

I am attempting to restrict editing on certain layers based on the user log in. Dim objLyr1 Dim objLyr2 Dim objLyr3 Set objLyr1 = Map.Layers("PatchPanel") Set objLyr2 = Map.Layers("wHydrant") Set ...
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49 views

Geoprocessing Ungroups Layers

Is there a fix for this, am I only imagining this, or is it a bug: ArcMAP 10.1 for Desktop Build 3035 on a 64 bit Windows 7 system When I run a geoprocessing task that modifies the input data (such ...
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0answers
125 views

How to add a MSSQL spatial layer using Python?

I'm having difficulty adding a MSSQL spatial data layer using Python. The database is password protected, and I can add the layer without any problems using the built in feature, but I can't make it ...
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77 views

Why does Describe function fail on annotation layer with RuntimeError: Object: Describe input value is not valid type?

I am accessing layers in an mxd programatically and also accessing the layer properties using the Describe function lyr =arcpy.mapping.ListLayers(mxd) # gets me the list of layers in mxd desc= ...
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65 views

qgis 1.8.0 crash when starting qthread

I am trying to update a vector layer attribute table using QThread. i connect a pushbutton click with a slot to start the thread: def EGSupdateAttributeTable(self): AttUpdateEGSThread = ...
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69 views

Sources for meterological data with high resolution

I was running Maxent on an endemic species of andaman and nicobar.But the climate data I have from worlclim.org ( tile number 29 ) is not of high resolution and thus I can't see the distribution ...
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36 views

How to search for layers in the layers panel?

I have QGIS projects with a lot of layers. Sometime it's difficult to find a layer into Layers Panel. How to search it?