Questions tagged [layers]

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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14 views

Dynamically changing fillColor variables in leaflet

When I want to style a polygon using a property the traditional way is to assign a function that returns a style object. Within that object you assign the fillColor property to a getColor function ...
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29 views

ArcGIS Online's new map viewer - sublayers?

I just opened up ArcGIS online for the first time in a few weeks and I see their new map view is out. I'm trying to get comfortable with it, but I'm struggling to find the sublayers option for layers ...
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QGIS can't save changes to a layer

I am using a layer named Faser,which I took from a program called locus GIS as ready layer,it was called power_lines_10kv30kv , I changed name to Faser and drew the lines with it : hier is the ...
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39 views

bringToFront() method equivalent in OpenLayers

Does OpenLayers have a method similar to bringToFront in Leaflet? In Leaflet this works as follows. If I have a layer called geometry this method will bring that layer to the top of the other layers ...
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1answer
40 views

How to do a layer/ shapefile filling of thickness / transparent by value in QGIS?

I have a shapefile with 500 rows. My goals is to assign each row a specific value of transparency. I know I can group these and then manually assign a transparency to these groups, however I want to ...
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28 views

Layer opacity qgis2web leaflet export

I am exporting my map with qgis2web and I would like to export the opacity of my layers as well. It does not work, somebody has an idea?
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42 views

How to serve a large vector dataset on GeoServer

I have a GeoServer on a VPS (6 cores, 24GB RAM). I created PostGIS store with a dataset of around 12GB (4.4 M polygons). From store I imported 10 layers (each represents a region of a country). It ...
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28 views

QGIS 3. Simple point or line layers manually

Trying to correlate historical submarine cable interruptions with geological events. Found a perfect raster-view of seabed and an .shp file of tectonic plate boundaries. I want to create individual ...
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1answer
46 views

Looking GeoServer layer name specification

I am using GeoServer 2.18.0 along with PostgreSQL database. My most of the data is coming from the database. Certain table name starts with special character like "%", few table names ...
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Using Apply Symbology From Layer feature when source layer's symbology is based on field built using custom expression

I cannot find how to set the "Source field" in the "Apply Symbology From Layer" tool when the layer I'm trying to copy from has its symbology based on a custom field. Here are some ...
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1answer
51 views

Can QGIS geopackage files with multiple layers exist as a single file with the .gpkg extension?

My question is about the basic structure of a .gpkg file. When I make a .gpkg file, they only ever contain one layer, and I cannot add additional layers to them. However, sometimes when I have added ...
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1answer
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Adding height values to map in QGIS

I am facing a couple of issues - I think they are related. Firstly... I am attempting to add height values to my habitat survey map to produce a 3D map in QGIS 3.12.3. I have height values stored in ...
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25 views

QGIS Heatmap not available?

I'm using QGIS Version 3.16.4. I thought one can do heatmaps by going to the properties of a layer and selecting it under symbolization. But as you can see, it's not available in the dropdown menu. ...
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Adding drawing effects to layer using query in QGIS

I am working with a layer of administrative areas. The administrative area in focus needs to have no label and a drop-shadow around it; surrounding administrative areas do need to have the label. E.G. ...
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How to hide a specific layer using QCheckBox widget (PyQt5/PyQGIS)?

I have a custom PyQGIS application that loads weather data on a basemap. Upon selecting an analysis type, the application loads a raster layer containing a colormap and two vector layers that contain ...
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Why are my layers after sharing and re-downloading a QGIS map almost all unavailable?

I have made a map on QGIS and when I save it and send it to myself and re-open it, the layers are unavailable. The only layer that shows up is the one I got through ArcGIS Feature Layer service. It ...
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Automatically display any metadata credits for non-service layers in ArcGIS Pro?

By default, ArcGIS Pro displays credits for service layers in the bottom-right of the map frame. This can also be added to a layout as dynamic text (in which case the default bottom-right version of ...
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How do I import .lyr files to QGIS? ukhab files. want to add them to a project

I am trying to add these layer files to QGIS but when I go to import they do not appear in the folder as they are saved as .lyr files but this is not an option. I am sure there is a really basic thing ...
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Extracting polygons from layer crossed by lines layer

I'm looking for a way to only select entities crossed by a lines layer from a polygons layer. I've unsuccessfully tried the Intersect function with lines layer overlay. I'm mentioning that I have used ...
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1answer
21 views

How to change “metres” from “degrees” without change of location? [duplicate]

I am working in QGIS (version 3.10). I know that in order to make certain distance analysis (in my case I want to do a heat map) a layer should have meters as units. Initially from the automatic SRC ...
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44 views

QGIS transparency layer export to pdf not working

I have in a drawing polygon layer with a degree of transparency setting. However, after exporting to PDF a layer is not transparent anymore. Where is the problem? I use QGIS 3.16.
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1answer
53 views

Sides of the polygon marked after deleting the OpenLayers layer

In other Q&As on the site, @QuentinN helped me to delete the added lines when the user clicks on the map. They are partially erased and the rest stays there and I don't know why ... The name of ...
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1answer
25 views

Positioning size labels on lines that delimit the polygon in OpenLayers

I want to position the label that defines the size of the side of the polygon exactly parallel to the line and not fall on the line above it ... Here is a picture as it is now: Now it is exactly on ...
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How to get the layer name of the WMS in the legend of the user interface

I have a problem with displaying the name of the layer in the legend of the user interface. I prepare the mapfile and I access with the WMS in my local test interface. When I add it to the user ...
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26 views

Displaying annotation data from CSV file on qgsmapcanvas

I am developing a custom Qt application using QGIS(3.14) C++ API. I need to display the annotation layer on qgsmapcanvas.CSV files contains lat, long, and country name and comma as a delimiter. I ...
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1answer
21 views

Creating python list of feature classes or layers using ArcPy [closed]

Step 1: I will generate a series of point feature classes. Each will have half the distance between points as its predecessor. Step 2: I then want to cycle over those point feature classes, but in ...
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1answer
41 views

Make a condition in QGIS with other layers

I want a QGIS composer form to change its color according to whether the value of an attribute of a layer matches a value, but for this I want to choose the attribute of a layer that is not the ...
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18 views

QGIS Why is the size of pie charts assistant different from symbol size assistant?

I want to plot a pie chart on a map (layer: BT stations_all). The pie chart circle should be scaled, so that its comparable with other values that take similar ranges (i.e. same legend). In the pie ...
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25 views

My ArcGIS hosted layers dont'show up in ArcGIS Online layers list

I am using the free trial of ArcGIS, I would like to make a map online but my shapefile is too big and ArcGIS suggested to upload the file as an hosted layer. I did and I can see the layer in my ...
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17 views

Creating layer for text labels in QGIS 3.10

How can I create a layer to hold individually placed text labels in 3.10? I can do it in print composer, but would like to have it as a layer for repeated use. The labels are simple text such as &...
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2answers
43 views

How do I add my .shp file as a Vector layer in QGIS?

I'm working in QGIS 3.12 and my university as given us zip files of "data" for each practical we do. I've unzipped it and followed steps of adding a vector layer and navigating to the right ...
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46 views

How to visualize layers from ArcGIS\QGIS project in their order

A lot of times I've seen visualization of layer in their order (like on the pic). Could anyone recommend a tool to make the same with my layers (could be QGIS or ArcGIS) or at least how this ...
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1answer
10 views

Rendering graduated symbology for dynamically called layers using ArcPy in ArcGIS Pro

I am trying to render graduated symbology for dynamically called layers using arcpy in ArcGIS Pro 2.7. The first code block below adds the layers to the map, but when I try to call these layers and ...
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1answer
44 views

What's the keyboard shortcut for select/deselect (on/off) multiple layers in QGIS?

As in ArcGIS, CTRL+CLICK, ALT+CLICK, SHIFT+CLICK works for multiple selection of layers, I didn't find a similar one in QIS. Is there any?
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1answer
29 views

Adding shapefiles to specific .mxd project using ModelBuilder

I am new to automating geoprocesses. In ModelBuilder, I conducted a geoprocess of transforming some points in excel to a shapefile, and then to make a buffer of 4 kms to these. As a result, two ...
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1answer
23 views

Can the “ol-layerswitcher” control be configured to indicate if a layer is not visible due to minZoom/maxZoom?

I have the OpenLayers layerswitcher control implemented and working. However, there does not seem to be any visual cue to the user that the layer is not visible due to minZoom/maxZoom (e.g. my ...
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20 views

I have deleted all the data in a SpatiaLite layer in QGIS. Can I get it back?

I am totally new to QGIS, and I am working my way through its tutorial manual. After adding a spatialite layer in tutorial 2.2.4 (https://docs.qgis.org/3.16/en/docs/training_manual/basic_map/...
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1answer
67 views

PyQGIS Export table with Replace all selected raw field values by displayed values option

I have a table with multiple fields with widget types configured (value map, checkbox, date/time). What I need is to export this table in a geopackage, using this in a PyQGIS script, using the "...
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1answer
88 views

Is topology stored explicitely in vector layers or is it derived from stored geometry information?

In vector layers, different types of information are stored like: Geoemtry Attribute data Meta data (like filename, projection etc.) Spatial indices However, what about topology? Is it an explicit ...
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1answer
32 views

QGIS 3.x adding a layer too the root of the project instead of the selected group

I''ve created a function to add layers to a QGIS project: def add_layer_to_project(layer, group_lst=None, visible=True): """ group name has to be list relative to root of ...
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52 views

New layer not showing up on map

I am using QGIS3 I have GeoSON layer that is not showing up on my canvas. When I zoom to the layer it zooms to a point that is very far from the rest of my map features. I would like the 'browfeild' ...
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1answer
34 views

Spatial Interactions - ArcGIS Online - Query based on mouse-click

I have a web map, authored and deployed as a web app. It contains a series of points and lines. I was wondering if it was possible to create an ability to click anywhere on the map, and have the ...
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21 views

Overwriting features without first removing their layer using ArcPy

I'm currently using arcpy.env.overwriteOutput = True because I want to be able to play around with variables and not have to delete the file from my gdb every time. But whenever I rerun the script ...
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1answer
27 views

QGIS Lost my layer settings

I am new user of QGIS and I am facing this problem I created a map in my main project and so some layers. it was working pretty good. But I don't know what I'd changed in parameters. and it gave me a ...
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1answer
23 views

Cannot change layer name in GeoServer 2.18

I install the GeoServer 2.18 in windows server 2012 r2, and with tomcat 9, JRE 1.8. it works fine. but I can not change the layer title/name. when I want to change the name, and I will get the error ...
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9 views

Removing Border from Layer List Symbology

When I launched my webapp on our server I noticed these little black boundary boxes appeared around the symbology in my layer list. This is my first webapp deployed using WebAppDev so I'm fairly new ...
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55 views

Selecting layers in QGIS autofilling batch Processing: reproducecable bug?

Can someone reproduce the strange behavior I encounter in QGIS? See below ("My workflow") for project settings and workflow. Basically, I want to use GDAL Build virtual raster in batch mode, ...
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1answer
74 views

Automatically create an array of all visible layer names in QGIS

How can I get an array of all visible layer names automatically using QGIS expressions? In principle it should work with the variable @map_layers. Using the following expression works fine for what I ...
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26 views

Using a feature in a function in OpenLayers

I want to use in the get_pdf_data function the data loaded in the "imobile" vector so that I can perform operations with the "imobile" vector. The code I'm trying to do this with ...
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1answer
141 views

Georeferenced raster image not appearing on map in QGIS

I imported a PNG file into QGIS for georeferencing, and set it to add automatically to map after finishing the process. However, once its job was done and the new layer and joined my list panel on the ...

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