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.
2
votes
1answer
520 views
Create new polygon layers from postcodes latitude & longitude
First at all, I want to say that I am geocoding enthusiastic but have no formal background on GIS. I'll do my best to use the right wording and make myself clear what I am striving for.
Also the only ...
5
votes
1answer
270 views
Sort layers in QGIS table of contents?
When I load a bunch of layers into QGIS from PostGIS, they seem to load in reverse alphabetical order.
Is there any tools or plugins that allow you to quickly sort the QGIS TOC in a different order? ...
2
votes
0answers
79 views
Ogr: How to add layer description to dgn?
I have created a dgn-file using Ogr, but can't find a way to fill out the description for this layer programatically. (something like _dgnLayer.Description = "Highways")
opts.Add("SEED=" + ...
1
vote
0answers
71 views
Layer set visible
I add this layer like this:
var POIData = new esri.layers.ArcGISDynamicMapServiceLayer("https://mysite.com/ArcGIS/rest/services/POI_Data/MapServer");
map.addLayer(POIData);
...
1
vote
0answers
45 views
Get layers and apply renderer to layer list from SDE ArcMap
I have the code that gets the layers from SDE, but when i add them to the map they have a different symbology. there is about 80 layers and i am accessing the SDE by getting the workspace from a ...
1
vote
0answers
129 views
How to add dynamic index layer for data driven pages
I am trying to create a dynamic map book based on user defined geometry. I can use Grid Index and calculate adjacent tool to create the grids in my Python script. How can I set this newly created grid ...
4
votes
1answer
583 views
Leaflet: How to move the layer-control menu?
This might be a silly question, but I could not find a documented way to achieve this.
I'd like to freely position the layer-control menu, probably to the top left near the default zoom-in/out ...
5
votes
1answer
98 views
How to convert PostGis Table (Grid data) to Continuous field using Qgis?
I'd like to transform my Gridded Layer (generated form a PostGIS table of points) to a continuous and colored layer. How could I do this with Qgis or any other program?
Many thanks and best regards,
...
0
votes
3answers
95 views
Accessing fields of particular layer
I am trying to access the fields which I can see in this particular layer. I am able to see that it has fields but fetching the values in those fields is something that I am unable to do. Is there ...
2
votes
1answer
140 views
Openlayers - Get Type of Layer
Is there a way to get the type of all the layers in an OpenLayer maps object? What I am trying to do is iterate over all the layers in my OpenLayers map object and populate a dropdown list with the ...
2
votes
1answer
86 views
Is there easy way to get layers names from WMS server?
I've been looking for information on how to get layers names from certain WMS servers, but I didn't find any.
E.g. I have this server: http://sdi.geoportal.gov.pl/wms_prg/wmservice.aspx and I want to ...
2
votes
0answers
108 views
Getting layers from SDE with vba
Im running arcmap 9.1. i have the code that lists feature classes in a list box from the SDE. The users select from one list box and adds it to another list box. How do i get it to show the layer name ...
1
vote
1answer
208 views
is it possible to obtain layerInfo from the Layer's URL
I am trying to fetch the names of the layers in the MapService, so that I can populate them in the dijit.form.select. I am able to get the layerInfo when the ArcGISDynamicMapServiceLayer is added to ...
5
votes
1answer
80 views
Load third-party APIs only when the corresponding map layer is requested?
OpenLayers allows multiple map layers to be hosted on a common platform. If the map application supports a wide variety of maps, say from Google, Yahoo and Microsoft, I find that upon initialization, ...
2
votes
1answer
192 views
How to record a base layer change event in OpenLayers?
The OpenLayers.Control class possesses an eventListener property which could be used in the layer switcher control. I am not sure how to make use of it to detect a base layer change event so that I ...
1
vote
1answer
381 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 ...
2
votes
0answers
150 views
calculate total Miles in a polygon using Google Map
I have an application that allows the users to create any custom polygon layer on top of google maps, i am interested to know if their is a way to select the road layer in this polygon and then ...
0
votes
0answers
145 views
how to turn on a group layer when a sublayer is turned on in Flex Viewer
I have a map server with layer structure like this:
-A (GroupLayer)
--AA (SubGroup)
--AAA (Feature Layer)
When I set AAA.visible=true, I need at least AA get turned on too.
I got my code like ...
3
votes
1answer
295 views
How to add a layer file to an ArcGIS map document programmatically?
I want to create a feature layer from a layer (.lyr) file and add it to my ArcGIS map document programmatically. I am using C# and ArcGIS.
I have a layer file and a shapefile.
2
votes
1answer
81 views
Library design: Layer coodinates/origin
I am working on a vector map library where you can add plain image and vector layers to a map. The map itself consists of an infinite coordinate system and each layer is a coordinate system of it's ...
2
votes
2answers
536 views
How to make the Overlays section in an OpenLayers LayerSwitcher exclusive?
At the simplest level I need to figure out how to create a customized OpenLayers LayerSwitcher Overlays section which is not using Checkboxes, but uses RadioButtons instead.
For my application its ...
3
votes
2answers
413 views
Create multiple vector layers by reading a GeoJSON file once in OpenLayers
I am a begginner to OpenLayers, and my question is about making things more efficient.
My work is about displaying time-dependent weather elements on several point locations on the map. All these ...
2
votes
1answer
967 views
How to change an OpenLayers vector layer from automatic to manual get request?
I have a web server that returns a FeatureCollection in JSON. I was getting this using the code below, which works perfectly:
var vectorLayer = new OpenLayers.Layer.Vector('geoJSON', {
...
0
votes
1answer
264 views
How to Obtain the feature attributes from feature collection
I am able to obtain the features of the layer which is selected by the user in the Layers table and then intersected by a user defined polygon, using e.features. I was able to obtain the attribute ...
1
vote
1answer
152 views
QGIS identify features button issue
Is there anyway to get the Identify Features button in QGIS to automatically select a layer and provide the information without having to highlight it first in the layers TOC? MapInfo and ArcGIS ...
0
votes
0answers
94 views
Where can one find GIS shapefiles for all of California's municipal jurisdictions (cities, counties, special districts, JPA, CFDs, etc.)?Edit
Cities and counties are easy but I've been digging a while for the other information and haven't had any luck. Particularly interested in water districts and some of the more major JPAs -- for ...
0
votes
0answers
104 views
how to show LINESTRING intersection with other layers in Openlayers?
I'm using Postgis/Geoserver/Openlayers and I have a query that gets al the "towns" that are near a "road". Now, "road" and "towns" are different layers, and I want to show them in Openlayers.
But I ...
1
vote
1answer
121 views
Problems with matching layers with different projections
I have two layers with the following projections:
Monte Mario IT1
UTM*
Anyhow, I followed the instructions (open the project, set the projection, select on the fly projection, load the layers but no ...
2
votes
1answer
201 views
Make Feature Layer tool problems in Model Builder
I am having a slight problem with using the Make Feature Layer tool in model builder.
Basically I have a file geodatabase of points. I am trying to make a model to pull out points according to a ...
6
votes
4answers
1k views
How to georeference a vector layer with control points?
I have a non-georeferenced vector layer that I need to be georeferenced. With raster layers the task is easy and straightforward, but I have no idea what should I do with my vector layer. I have a few ...
4
votes
3answers
2k views
Change Icon of Single Vector Feature in Layer
Currently I am trying to change the icon of a particular feature of a vector layer that the user is focusing on. I add each feature to the map like so:
var point = new ...
0
votes
1answer
90 views
Difference between a *.lyr and layer directly added from *.gdb/sde to mxd?
What is the difference between a *.lyr and a layer directly added from *.gdb/sde to mxd?
Doing it difference in mxd?
Which is better?
1
vote
0answers
143 views
Hack to change data source of a layer file in ArcGIS 9.3.1 with python?
I'm looking for a way to change the source of my layer file using python. Actually I want to do this because I need to re-use a XSL template which is defined under the tap HTML popup of the layer ...
1
vote
2answers
399 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 ...
2
votes
1answer
531 views
Problem with layer order in OpenLayers and Google styled maps
I'm using OpenLayers with Google styled maps. My biggest problem is KML polygon layer which needs to be under roads layer but it isn't (see prtscr). What am I doing wrong?
This is my coding:
...
3
votes
1answer
242 views
What open-source web mapping solution I need to use for this situation?
I will try to explain what I need to do. I have about thirty KML polygons. I need to put them on some satellite map. On the top of these layers (KMLs, satellite) there must go layer with roads. I ...
0
votes
1answer
265 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", ...
3
votes
3answers
162 views
Why does the layer list context menu not open anymore?
I cannot access layers properties (i.e. change color, filter by query, anything).
The mouse right click doesn't do anything.
Is there a way restoring qgis to default?
Ubuntu 12.04, QGIS 1.8
3
votes
1answer
283 views
How to hide some parts of an image layer with OpenLayers?
My Problem
I'm currently displaying a layer image above a Google Maps base layer. I would like, when the user check/uncheck some checkboxes, that some parts of this image layer disappear, and the ...
3
votes
2answers
780 views
Load layers only when zoom level is reached
I'm trying to load different layers based on the user zoom level with OpenLayers. I've seen some similar questions in here, but they load the layer and then hide/show it based on the zoom level.
I ...
2
votes
0answers
119 views
The layer added did not move in ArcGIS 10
I have a favor to ask. I already done the step that Mr PolyGeo and Aaron gave me from my previous question and it really look great when the layer did match all together. Thank you for that advise.
...
5
votes
1answer
361 views
Export each layer in map to a separate image
I have a mxd file with multiple layers I have to export to PNG/JPG. I would like to create a script which turns on layers one at the time before they are exported. So far I have come up with the ...
1
vote
1answer
90 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 ...
1
vote
1answer
199 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 ...
1
vote
1answer
64 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 ...
2
votes
1answer
90 views
How to add Checkboxes in Geoserver
I have a POI table with some data of categories like Airport,ATM,Bank etc. I want to show these categories as checkbox so that if I click in the ATM Checkbox, only the ATM Points will be display. Is ...
0
votes
1answer
429 views
Select by Location tool
I am using the Select by Location tool to select certain polygons on my shape-file layer. I start by having a given point as my Selecting Feature and that its relationship is completely_ contains. ...
2
votes
1answer
70 views
Clipping from a given point
I am working with model-builder and I am trying to clip an area around a certain point. Is there a tool that I can use in which I can assign it a certain distance from the point. For instance, if I ...
2
votes
0answers
350 views
legend groups and layer position/order qgis 1.8
I'm tring to programmatically create layer sequence also using groups.
Simple python code:
layer = QgsVectorLayer("004cp000.shp", "004cp000", "ogr")
QgsMapLayerRegistry.instance().addMapLayer(layer)
...
0
votes
2answers
729 views
How to get names of all layers in a store in GeoServer using OpenLayers
I have strict requirement to retrieve names of all layers in a GeoServer store using OpenLayers. I've gone through the post here, but it doesn't answer my question. I've also gone through GeoServer's ...
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