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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1answer
47 views

TileMill: How to mask layer without loosing background

I have a large geotiff with elevation gradient which I want to use to colour my map. However the coastal line of the geotiff doesn't excacly match my shapefile so I want to mask it. The problem is ...
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0answers
20 views

QGIS view selected layers, manage views

I have a QGIS project with a large number of layers. Is it (without using Postgis) possible to define "Views" which include different subsets of the layers? For example: View 1: Layers WMS ...
2
votes
1answer
64 views

OpenLayers - cannot set layer opacity

I have the following problem: by default, you can simply change the opacity of layer by writing for example: layer.setOpacity(0.3); But when I add it to my map SelectFeature controls, my layer is ...
2
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0answers
49 views

Memory layer or QgsVectorFileWriter Error?

Currently this excerpt of code will not save to file (as it is supposed to). The memory layer is visable and editable. Yet even when manually saving the layer, any priorly added features ...
2
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0answers
62 views

multiple image in OpenLayers

I'm fairly new to OpenLayers so please bear with me. I'm trying to add multiple images to OpenLayers. I have the following (some code is excluded): var images = [image1,image2,image3] // these are ...
2
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1answer
453 views

How to perform a true GIS clip of polygons layer using a polygon layer in R?

I would like to do a true GIS Clip in R of soils polygons using a series of single boundary polygons, but I cannot find an R function to properly do it. It should work just like the CLIP function in ...
2
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1answer
67 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 ...
2
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0answers
44 views

Updating Description of MXD Layers

Is there a way to force the update of the Description content in the Properties/General/Description of each feature layer in an MXD? I frequently update metadata for each feature class in ArcCatalog, ...
2
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0answers
63 views

Is there a size restriction on KML layer in esri map?

My website utilizes ESRI's map and it contains several KML layers. Most of them show up fine except for the ones bigger than ~4MB. Are there any restrictions on KML file size? Thanks,
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0answers
94 views

why is my map is not in the center when I load my map in OpenLayers?

why is my map is not in the center when I load my map in OpenLayers?And when I drag my map,it dont move sometimes,It has been tortured me for a long time,any advice would be grateful! var maxExtent = ...
2
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0answers
40 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?
2
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1answer
230 views

OpenLayers - How do I change the WMS URL in Code

I want to be able to change the url for a layer in code. The reasons is that I am implementing local caching. When local caching is Not enabled, we use 4 servers to deliver tiles to run parallel ...
2
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1answer
2k 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 ...
2
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0answers
51 views

What is the best way to manage dependencies between layers?

I have multiple layers that has dependency with each other. Such as: City; Courts; Lots; Front Lot; Buildings. The polygon's "block" depends on the polygon's "City." Example dependency: Buildings-> ...
2
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0answers
150 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=" + ...
2
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0answers
295 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 ...
2
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0answers
179 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. ...
2
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0answers
55 views

Merging Layers and assigning different values [duplicate]

Possible Duplicate: Merging Two or More Layers I am working with three clipped layers that are shown in the TOC. I created these layers from a large watershed shape-file. However, each ...
2
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2answers
103 views

How to bind layer display?

I work on several layers in arcmap 9.3 My question is about creating binds to display theses layers directly. like ctrl+1 ( display / hide layer 1 ) ctrl+2 ( display / hide layer 2 ) ctrl+3 ( ...
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0answers
476 views

Add CAD Drawing Dataset into ArcMap using Python

I am trying to add an CAD Drawing Dataset into ArcMap using Python. Question is how to add a Auto-CAD .dwg file to ArcMap using Python Normally comes in as CAD file within a Group layer with: ...
1
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2answers
254 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
302 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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2answers
83 views

Error adding a delimited text layer

Im working with QGIS 1.8.0 and I have been trying to upload a delimited text layer but keep getting the following error : The layer ...
1
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1answer
131 views

OSM labels look as red point in geoserver preview layer. Why?

I've imported shp directory files of OSM to geoserver and the city label layer look like red dots instead of showing labels of street names. Is there a fix for this ? (should I declare this layer kml ...
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1answer
44 views

Combine drainage streams and watersheds [duplicate]

I have a question regarding ArcMap. Lets say I have a .shp with watersheds and a .shp with drainage lines. How can I combine both, so that I can display single watersheds and the length of their inner ...
1
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1answer
143 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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1answer
68 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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1answer
1k views

Add simple image layers to MapBox / Leaflet?

Is there an easy way to add simple image layers (with no, or very limited, GIS data) to Mapbox and/or Leaflet? Google maps seems to have the ability to add custom layers, simply by attaching the SW ...
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2answers
435 views

Custom filters (server side) for Openlayers Vector Layer

I have a vector layer in openlayers with source in GEOJSON (custom php server, which I have in complete control) and BBOX strategy. Vector points contain point sources which have different ...
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2answers
3k 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 ...
1
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1answer
38 views

How to create a text file containing layer names in QGIS?

My QGIS ToC contains layer groups and some layers that do not belong to any group. I would like to create a text file containing the name of those layers that do not belong to any group. Is there an ...
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2answers
63 views

Add multiple Layer files in subdirectories to mxd using python

I have more than 300 layer files located in many sub-Folders and sub-sub-Folders. All Sub Folders are located in one large directory.I read Use python to add layers to TOC and I try, with arcpy, to ...
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1answer
46 views

python script to retrieve names and scale range from an ArcGIS MapServer url

i am pretty new at ArcPy. i need to write a python script to retrieve names and scale range from an ArcGIS Map Service url. i had a look around json and url2lib but i am lost. I want to retrieve the ...
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1answer
122 views

How to transfer layer data from OpenLayers to PostGIS database or QGIS?

Supposing I have a created some layers in OpenLayers containing only Geometry Points, how do I transfer my data to a postGIS database? Is there a way to turn pure javascript/openlayers to a table in ...
1
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1answer
65 views

How can I change layers visibility while I zoom in geoserver?

I want to change layers visibility while I zoom , here are my screenshots. where is my error ? I'm waiting your helps , thanks.
1
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1answer
84 views

Is the MakeFeatureLayer temporary location the same as “in_memory”? [duplicate]

From the ArcGIS Desktop Help: The layer that is created by the tool is temporary and will not persist after the session ends unless the layer is saved to disk or the map document is saved. ...
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1answer
592 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, ...
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2answers
123 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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1answer
205 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 ...
1
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1answer
430 views

Code works on python console in QGIS but same doesn't work in stand alone script

I'm trying map rendering with stand alone script, so I have small script which works fine in python console provided QGIS, however when I run same code in stand-alone script it executes without error, ...
1
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3answers
230 views

Is there an iOS app to display several offline raster maps with transparency?

There are several iPhone apps displaying offline maps. Some of them can show custom maps, for instance loaded as MBTiles or sqlite files. Galileo-app does this pretty well. But it is only possible ...
1
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1answer
115 views

Delete Turned Off (Unchecked) Layers from Arcmap with Python

I have about 100 figures that have been updated countless times and a lot of the old data was left in each .mxd but was only turned off (unchecked) and not removed. I would like to remove these ...
1
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3answers
189 views

How to prepare a multi-colored vector layer?

I need to present a multi-colored vector layer and something similar to below: I need to prepare the vector layer by making use with the data set available in my database. Inside my database, I ...
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1answer
63 views

How to preview new added layer in Geoserver?

I get my GeoServer up and tried to published my layer. I have my own shapefile and I follow the document below to add new layer intend to publish it. geoserver shapefile-quickstart doc Referring to ...
1
vote
1answer
103 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 ...
1
vote
1answer
244 views

How to set style in the database (QGIS)

Is it possible to set style layers in the database? (QGIS) [MySQL database] I would like to set and share my style to other users when they open the layer it's still as my style. Thank you
1
vote
1answer
210 views

Error 'Invalid geography. Antipodal edge…' with Postgis

I have a table in postgis like this CREATE TABLE locations (id int, name VARCHAR(255), pos geography(POINT, 4326)); with a couple of points. E.G. INSERT INTO locations (name, pos) VALUES ...
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1answer
182 views

How to make a virtual layer from ogr geometry?

I know how to do this: nodes = driver.Open(node_nav,0) node_lyr = nodes.GetLayer() node_lyr.SetSpatialFilter(None) But how do can use the layer methods on a geometry I created from scratch? ...
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2answers
2k views

How To Highlight Roads?

I wish to change the colors of various roads on a map and save the changes to either a "personal map" or a "map layer." The personal map could look something like this, except it would need to have ...
1
vote
2answers
386 views

ArcGIS 10.1: “ERROR 000223: Cannot extract event table properties” when iterating through multiple files/folder

I am trying to convert ~270k csv-files with lat/long-data to layerfiles. The files are split into folders by year, i.e. ~30 folders with ~9k csv-files in each. I have written a script to iterate ...