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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105 views

Determining active layer regardless of its name using ArcPy?

ArcPy has a method of defining an active map regardless of its filename or path: mxd = arcpy.mapping.MapDocument("CURRENT") I wonder if there is a similar way to define an active layer. I need it ...
2
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176 views

What is wrong with my data receiving from php script for geoJSON TileLayer?

I want to get geo data as geojson for geojson tile layer requests in leaflet. I set up a geojson layer like this: https://github.com/glenrobertson/leaflet-tilelayer-geojson/ A php script answers ...
2
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1answer
647 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 ...
3
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2answers
238 views

Hotkey in ArcGIS for Desktop to delete layer from Table of Contents?

I'm using ArcGIS 10.2 for Desktop and wish to remove/delete a layer from the Table of Contents. I cannot find such hotkey. I have tried the DELETE button but that does not do it. Also such hotkey is ...
2
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2answers
811 views

How to export all the layers from Table of Content to shp file?

I have got lots of different layers in the Table of Content panel in ArcMap. I want to export them all in shp format in one go. How can I do that? So far I have been doing it one by one by right ...
2
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0answers
203 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 ...
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0answers
21 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 ...
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0answers
121 views

Vector layers without geometry in QGIS?

Using QGIS, I have set up a couple of automated layer additions via the toolbar. After adding geometry in each respective layer (point, lineString, polygon) and saving changes to the layers, the added ...
2
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0answers
187 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 ...
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1answer
422 views

Can I save an ArcGIS geospatial PDF with layers turned off, which can then be turned on individually in a pdf viewer?

I am working on an mxd that has many individual point layers (displaying species locations). To make life easy for my stakeholders, I'd like to export to a geospatial pdf so that all of these point ...
2
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1answer
312 views

How to convert ASCII in x,y,z format using gdal_grid?

I have a map saved in (AFAIK) Arc/Info ASCII format and I would like to convert it with gdal grid but I am getting errors. My data (p.csv) is in the following format: 319053.25,319301.12,544.28 ...
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0answers
45 views

Lining up three Layers that use same Coordinate Reference System (CRS) in QGIS?

How do you make all borders of a layer equal? they should be equal but i don't know how, mCRS layer is all in philippine zone 5(EPSG:3125), with the same formula/equation, I'm new to QGIS and I'm ...
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1answer
52 views

Merged Layers turned into square shape cause by single layers in QGIS?

What I did is merged the 30 layers of the map (Isabela Map Province - Philippines) and below is what happened. How do i remove the inside map of the border? I'm new to QGIS and I'm using QGIS 2.4 ...
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2answers
1k 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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0answers
43 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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1answer
631 views

Meaning of Spatial Join ERROR 000840: The value is not a Feature Layer?

I'm using ArcGIS (ArcMap) 10.2 to determine the relative location of points of land to a regulated area. I downloaded a layer (.lyr) file that displays the regulated area, and am able to display that ...
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1answer
199 views

Merging vector layers using QGIS? [duplicate]

I have dozens of vector layers that I want to join together in QGIS. They have identical fields. How do I do this?
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1answer
394 views

Setting Layer Properties Using ArcPy

I am writing an ArcPy script that creates a Point Density Raster file, and then changes the following properties in the resulting layer: Symbology Classified Classes = 10 Classification Method = ...
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0answers
83 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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0answers
368 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 ...
0
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1answer
120 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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0answers
16 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
83 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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1answer
440 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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1answer
433 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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216 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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1answer
50 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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0answers
26 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
118 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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3answers
108 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
112 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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1answer
205 views

Disappearing layers in ArcScene?

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 forth to do some analysis. A ...
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1answer
82 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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0answers
15 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
121 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
188 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
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1answer
209 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
97 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 ...
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1answer
28 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 ...
1
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2answers
1k 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 ...
1
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1answer
176 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 ...
1
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1answer
2k 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, ...
5
votes
1answer
1k 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
289 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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2answers
219 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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2answers
667 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 ...
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1answer
130 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 ...
0
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0answers
36 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
86 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
432 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 ...