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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Uncaught TypeError: d.Wa is not a function

I am trying to add a feature collection fetched from a server to the source of an empty vector layer, but I am getting this error (using OpenLayers 3): Uncaught TypeError: d.Wa is not a function I ...
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20 views

How to programmingly get the feature from a layer by the feature's ID in Python QGIS? [on hold]

I have get a list of polygon features' ID, I want to get the corresponding polygon features by these IDs in the layer, then if I want to do some calculations by using the polygon's geometry. How can I ...
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1answer
27 views

Button to turn off all layers in ToC at once?

I have created a map that has a Table of Content that i use to turn on and off desired layers. Is there a way to create a 'Clear' button that will untoggle the selected layers? I have a clear button ...
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1answer
7 views

Geotools - Create a line layer

I am using the Geotools library to develop a Java Swing application. I am having a problem creating a layer with lines between points. Can someone help me? Here my code: import com.vividsolutions....
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13 views

What is layer stacking and masking out?

I'm very new to GIS. Can you tell me what is layer stacking and masking out means in ENVI software
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20 views

Looking for a map solution with layers [closed]

I am looking for a mapping solution that has layers. I want my final result to look something like the Southwest Airlines Interactive Route Map https://www.southwest.com/travel_center/routemap_dyn....
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29 views

Representing multiple polylines in unique vector layer?

I have imported a layer which contains a lot of lines. They overlap each other in a cross kind of pattern. When zoomed out it can look like this: When zooming in on one of the broader lines it ...
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12 views

Lost layer on map [closed]

Does anyone knows how to get back layer on map? I vectorized the river and layer is marked on my left side but I don't see vector on map. Does anyone have that case?
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2answers
41 views

Comparing layers in QGIS and finding overlay?s

I'm a newbie to QGIS. I have run into a thing I can not solve despite trying to search for a solution and working through the functions in the tool. I have two layers I want to compare. One is filled ...
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1answer
31 views

How to rename unique value using arcpy

I work with several MXD files. In each map there a polygon layer with unique values: I try to change in the table of contents the "a" into "land use" by using this code: import arcpy,os,sys from ...
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8 views

Moving nodes of different multipolygon on different layers

I would like to import into Openstreetmap the land-use data. In order to do a good job, I would like to correct some imperfections before the import. Take a look at this screenshot (which is a small ...
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1answer
17 views

Using leaflet or google map to create layer of multiple attributes

I am creating a map with leaflet layer. Right now, each marker has three different attributes and I would like to create layers base on these three attributes (Model, group, and status). I am able to ...
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1answer
22 views

importing files from grass mapset to QGIS Layer Panel

I am performing an NDVI calculation against 2 sets of rasters. One produced by LANDSAT5 the other by LANDSAT8. r.mapcalc "L8_NDVI = float(L8Band5 - L8Band4) / (L8Band5 + L8Band4)" The L8_NDVI file ...
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1answer
30 views

Applying symbology to raster layer in ArcPy without using symbology layer (layer file)?

I have a raster layer with 3 unique values (1,2,3) and I want to apply a unique color to each using RGB values or hex codes, without the use of a symbology layer (layer file). Is it possible to ...
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35 views

ReplaceDataSource of SDE layers in map documents (mxd) with old feature classes newly organized under feature datasets in the same ArcSDE

I need some help to replace the data source of old SDE layers in the map documents. The replaceDataSource method in the code below is not working properly resulting in a broken link of the target ...
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1answer
35 views

Field list in combobox in pyqgis

I'm new to pyqgis and I'm tryig to make a combobox with list of fields (from layer also selected in combobox). layers = self.iface.legendInterface().layers() layer_list = [] for layer in ...
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15 views

Query in symbology as in labels using Arcgis 10.0

I'm using a bigger data set of points indicating different categories in ArcGIS 10.0. Single polygon, say district, may have a number of categories in it. I was wondering if I could make query of ...
2
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1answer
32 views

Most efficient way to select a given layer programmatically in QGIS

this a question about code efficiency, not asking how to loop through layers. I'm getting the 'this question appears subjective...' warning but there must be a tried and tested method by someone more ...
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22 views

MMQGIS plugin-merge problem

I work with 3 polygon layers (with the same CRS) from different data source each. I try to merge those layers with MMQGIS plugin. The problem is that only 2 layers merged: While i expected to ...
3
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2answers
64 views

Distinguishing shapefiles from geodatabase feature class with arcpy.Describe() method?

I have a list of layers (.ListLayers()) taken from a dataframe . In my case the layers can have two types of data source either shapefile or GDB. I want to start different actions depending on the ...
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1answer
88 views

Can't create polygon in an editable layer in ArcMap 10.3

There is an editable polygon layer in ArcGIS 10.3 I can edit already existing polygons but I can't create new ones. The layer does not appear in the "Create Features" list. I have another polyline ...
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22 views

Change the Shortest Path graph to shapefile

Can I use the shortest path graph from the https://docs.qgis.org/2.6/en/docs/pyqgis_developer_cookbook/network_analysis.html example and make shapefile or a layer? Or is necessary to modify the ...
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1answer
26 views

Proportional circles as function of value NOT range

I have two point layers, each containing one column of values. When using the graduated style in layer properties, the size of the points is relative to the total range of values within that layer . ...
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35 views

Leaflet map with 'query of features' on mouseover and multiple layers

I have produced two working Leaflet maps that in total contain the features that I need for my application. However, I cannot solve how to have multiple 'overlay' layers that can be queried with ...
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21 views

How can I stop crashes when opening layer properties after adding SVG paths?

I am running the most recent version of QGIS, 2.14.3. I recently added several folders to the locations of of SVG files, but I opened the Style Manager and removed them when the crashes started. ...
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2answers
48 views

Running Python script that includes ArcPy functions?

I have to export about 250 layers in one mxd File to maps in ArcGIS 10. I found a script on this site at Exporting each layer in map to separate image using ArcPy?: mxd = arcpy.mapping.MapDocument(...
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1answer
42 views

How to ignore “handle bad layers” in QGIS?

I have a QGIS (2.14.3-Essen) project that I use both at work and at home. I keep all but two layers with the project. The two remaining layers are very large - a DEM and hillshade totaling more than ...
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16 views

Maximum likelihood classification- changing class colour with every layer

I created a signature file, where I defined 4 different classes, which I named and coloured specifically. When I try to use the maximum likelihood classification tool for other layers, the classes ...
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1answer
31 views

Can I save the symbology of all the layers in my mxd so that I can quickly revert back to a certain “look”

I am using ArcMap 10.2 and would like to set multiple variations of the layers symbologies. In autocad this would be the equivalent of setting the layer state.
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1answer
15 views

Arcpy MakeFeatureLayer_management issue using SQL condition

I have a lines shapefile. I made a small code to select some of its elements and turn them into a standalone layer. The code is like this: arcpy.env.workspace = r"C:\MyDirectory\Mygdb.gdb" network = ...
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1answer
22 views

lyr replaceDataSource not reflecting

The changes I made to the MXD with ArcPy is not reflecting the changes in ArcMap. arcpy.env.workspace= "C:\Users\UserID\Desktop" mxdlocation=os.path.join(arcpy.env.workspace,mxdname) mxdloc = ...
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1answer
34 views

How do I make two layers of point data align perfectly?

I have two point data sets that represent the same business locations, however, the points are slightly off for one of the two layers. As in one layers points are in the correct position over the ...
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1answer
21 views

Can I split my data based on the polygons in a different layer?

Carto has a built-in dataset with polygon data for UK administrative regions. I have put another layer over this, containing several thousand data points (postcodes). Is there an easy way to find out ...
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2answers
72 views

Mapbox GLJS - group layers

I'm trying to build an interactive map, without any knowledge in javascript, and i found myself a bit lost in this large world. I've already designed my style in mapbox studio. And now, trying to ...
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2answers
32 views

How to Close all Layers but keep Tables on MapInfo using MapBasic

I'd like to know how to close all the layers on MapInfo but keep the tables open using MapBasic code. The idea is to be able to keep the tables open so that I can create multiple different maps using ...
4
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1answer
110 views

How to load multiple vector layers into QGIS' map canvas using python scripting?

I am trying to write a standalone script in python to create a QGIS map canvas. The vector layers I am attempting to load are Shapefiles. Currently, I am able to load each vector layer, add them to ...
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2answers
52 views

Leaflet, changing base map CRS

So i am using leaflet in order to create my project, which is a world map that certain layers would be add on top of it. I am wondering whether I should change the CRS property of the map object, ...
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0answers
29 views

Problem in layer overlapping (qgis)

I want to plot gps pts on qgis (version 2.14.1). I have added the vector layer of SE Asian countries, and added the delimited text layer of my gps pts which included species name, lat and lon. ...
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11 views

Loop Quality layers of Modis in R

I want to parse quality layers of Modis MOD13Q1 in R. I´m using a code from another question here! and it works fine, but i want to loop it for 300 files. I grouped them in stack of rasters and tried ...
2
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1answer
37 views

Iterate through layers of an MXD

I found this, under the topic How to iterate through layers of an MXD? answered by Midavalo I wanto to know if its possible to change something in the second line, to iterate through all data frames ...
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1answer
29 views

Showing only 1 layer at a time in CartoDB

Is there a way in the free CartoDB to set the layer selector so that you can only select 1 layer at a time? When one layer is selected, deselect all other layers.
2
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1answer
49 views

Add qlr file in QGIS- problem

I work with a polyline layer: and the layer located in "G:\desktop\qgis\lyr". After i save the layer in qlr file and saved it in "G:\desktop\qgis\lyr", i try to load the qlr file with "add from ...
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1answer
58 views

Grouping layers in Table of Contents in ArcGIS for Desktop?

I'm trying to group layers in the table of content so that I can expand or collapse them as needed. Not sure how. I'm using ArcGIS 10.3 for Desktop.
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16 views

Generating detailed layer properties report [duplicate]

Would anyone advise me how to generate detailed layer information report in ArcGIS 10.3. I mean the details described by layer properties window for a layer like Source, Display, Definition Query, ...
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0answers
28 views

Custom map : Layers, sublayers and public transport directions

My objective is to create a custom map for public transport with several layers in it e.g: Under a layer named 'Leisure', I can have several bus/train/boat routes(multiple steps may be involved) I am ...
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14 views

GeoServer: Composite and blending for specific layer in WMS call

I use the destination-in vendor option to use a polygon layer like a mask, so that only some parts of a raster layer are shown. The sld is defined for my polygon layer. In my WMS call a specify both ...
3
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1answer
72 views

ArcMap can't switch layers order

I have 5 different layers. I would like to change the order they are drawn. I read that (and I also used to) simply select and drag the layer from in the position I want. Nevertheless, now I am trying ...
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31 views

Files added using *.qlr result in bad layer after save and reload

I'm converting CAD to Shape (separate point, line and area shapes per *.dwg in a folder). In the process I parse the shape info to a donor *.qlr (to the same folder). The qlr is a donor file with ...
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1answer
84 views

Coordinates from Excel list

I'd like to import Coordinates from an Excel list, for this reason I saved the excel sheet as an .csv ant tried to import it via "Layer --> Add delimited text Layer". The points are imported, but with ...
3
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0answers
38 views

PyQGIS select layer by original table name

As far as I see, on QgsMapLayerRegistry.instance() there is a method to select layers: mapLayersByName(Qstring) and the method mapLayer(QString) respectively, wich accesses a layer by its id. ...