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 topics for a map.
2,214
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Import tiles OpenStreetMap QGIS [closed]
I have a map in QGIS that is supposed to have multiple layers, a custom made map, and a google street/openstreetmap layer.
The layers somehow don't work, and so I decided to make a new connection. I ...
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QGIS - selecting single polygon highlights multiple polygons [closed]
I have two files,
One file is having GIS information of all the polygons which I want to display in QGIS. The other file contains the source polygon name from first file in one column, and the second ...
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How can I Publish all layers at once, configure Declared SRS, and have the same Bounding Boxes [closed]
How can I Publish all layers at once, configure Declared SRS, and have the same Bounding Boxes.
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QGIS changing layer colors
I'm having a problem with several QGIS projects. I style and format the vector layers, save, and when I reopen the project another day the formats are changed. All the vector layers appearing in blue ...
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ArcGIS Query Layers, dynamic schema changes to source [closed]
I’m currently using utilising a large SQL view which is managed by a different department. This contains a large amount of fields which are filtered out in the query layer.
One thing I’m struggling to ...
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How do I dodge overlapping line/polygon layers so that each is visible in QGIS?
I have 3 separate polygon layers that often overlap (image below). How do I change the symbology in QGIS to have them parallel to one another and not overlapping? (as shown in the second image below).
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How to see the size of individual layers in a geopackage
How can we see the disk size of individual layers that are packed together in a geopackage?
I am a big fan of keeping all layers (and their styles) of a QGIS project inside one geopackage only. Its ...
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43
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Select several layers by name using an expression
I'm am new to using PyQGIS and this question has been answered in various forms already, however not specifically the way I need it; I have a big QGIS project with several layers with similar, but not ...
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Visualization of CDSE WMS tiles using Folium
Using the Copernicus Data Space Ecosystem dashboard I created a New Configuration that I am able to visualize on Folium using Python.
How can I specify an absolute timestamp? I want to visualize a ...
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Why is the "Label Properties" window greyed out for editing in QGIS?
I'm running Win10 (32GB RAM, i5-7500) and QGIS 3.28.2-Firenze.
I have a project I was given to write a report on. In QGIS there are text labels not associated with layers (but describing them I ...
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Update fields in table in PostGIS database by joining attribute by field value from a layer
I have a table in my PostGIS database. Its geometric objects I loaded in to my QGIS project as layer where I can edit them. In this layer (layer A) there are features with null values in some fields. ...
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Identifying district boundaries outliers in QGIS
I have a Nigeria shapefile that shows the district boundaries, I also have geocordinates of some health facilities, when I visualize on QGIS, I notice outliers ; some facilities are showing in a ...
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Need to have symbol 1 & 2 from a single LineString layer show above/below a MultiPolygon layer using QGIS
Layers are LineString and MultiPolygon obtained using QuickOSM
LineString contains Rule-based symbology:
"wires"='single'
"waterway"='river'
MultiPolygon Contains Rule-based ...
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Using Cadastral data - how can I count number of Lots in a given Suburb based on my calculated field AreaOfLot
I make us of my local Councils Cadastral data, and I'm looking to identify all properties over a certain area within the surrounding suburbs.
I have loaded in Layers for "Lot" and "...
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Accessing layers from QgsContext transferred by completed QgsTask using PyQGIS
We have a headless QGIS standalone script that needs to run some I/O intensive layer retrieval tasks, each as parallel background threads before doing further GIS processing.
We are invoking our ...
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Calculating field with input from two layers in QGIS Graphical Modeler
Even though I found similar questions, I couldn't find a suitable answer for the problem I have.
I want to create a model that calculates the difference between two fields ("NUMPOINTS") from ...
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Changing the gradient color of a layer polygon on conditions that depend on another layer on QG
I hope the title is not too much convoluted.
I am using QGIS to interact two layers. The first layer is geometrical shapes representing contiguous counties. The second layer is given by calls to ...
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Where to find the comment of column in QGIS?
I created a column with a comment but where do I find this comment later on?
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239
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Points not showing on map on QGIS
I uploaded my coordinates as a CSV file and they show on the blank page on QGIS but when I try to make them show on the map they don't, either if I use OpenStreetMap or Esri Satellite, it's like they ...
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Hiding/showing layers in legend does not work in QGIS standalone
I'm building a standalone app with PyQGIS. I encountered some difficulties building a canvas that show the result layers after some operations.
The canvas works, but the associated legend does not ...
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41
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QGIS boundary select smaller polygons that are contained within larger polygon
I have two layers which are perfectly nested. There are dozens of SA1 polygons (thin grey outline - see image attached) within the LGA polygon (thick green outline - see image attached). I would like ...
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Left to right (Flipped) Names in Arabic [duplicate]
Names of districts are showing flipped
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QGIS - How can I combine two rasters on top of each other
In QGIS I have 2 rasters, let's call them LowQuality and HighQuality.
I have a large area of LowQuality data, and some HighQuality data which should substitute the LowQuality data in those cells.
In ...
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Set points according to coordinates using QGIS 3
How can I set points according to coordinates?
I know that you can see the exact coordinates when you set a point. But I just want to type or copy the coordinates in to set a point. For an example how ...
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How do I map points from a CSV file against bands in a raster?
I have a series of biome maps in QGIS 3.32 as multiband (RGB) raster layers. In a separate layer I have a series of points imported from a CSV file. How do I go about mapping the points (or rather a ...
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QGIS: Info window about every layer is not readable
I have a new problem in QGIS 3.28.8 (OS Linux Mint 21.2):
If I move the mouse over a layer-name in the layer panel on the left, usually I can read some information about this layer (data source, ...
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PostGIS layer and SRS in GeoServer
I wanted to add layers in GeoServer via my PostGIS database, but I noticed that the native SRS is not recognized and that the declared SRS is EPSG:40400 (see screenshot).
Knowing that I can modify the ...
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Filtered features in attribute table
Attribute table header of point layer says: "Features total 1200, Filtered: 1197, Selected: 0"
There is no layer filter active and also no filter is set in the layer properties under tab &...
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3
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142
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Labeling layer with two attributes in QGIS
I use the QGIS version 3.28.4-Firenze and I have the following question:
How can I label a polygon layer with two attributes, where the two attribute labels should look different (color, shape, size) ...
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Layers disappearing from Layers panel
Twice now when I have created new layers, most of the others disappeared from the layers panel. The first time happened when I created a temporary scratch layer, the second time was when I created a ...
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Distance between point layers in QGIS
I have data points where respondents have indicated where they were on vacation (variable pointsSH). In the attribute table of these data points is stored where the people live (the zip code). I also ...
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43
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Determine loading state of base map layers in Leaflet?
What is the JavaScript command to know the loading state of the current layer? I'd like to know is the layer is loading, with 'true' or 'false', when the page loads or when I move the map.
This ...
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Error when opening WFS layer in QGIS (Cannot do natural order without a primary key)
We want to open a Geoserver WFS layer in QGis but ending up with the error:
Exception occurred while computing reprojected bounds
java.io.IOExceptionCannot do natural order without a primary key, ...
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Automatically loading QML style file based on layer name in QGIS
I have a folder with ~100 QGIS-style files (.qml). Is it possible to tell QGIS that whenever I load a layer which has the same name as one of the .qml files apply that style instead of giving the ...
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Fetch name from active layer
I'm trying to get the layer name only to use further in a script.
Printing layer in layer = iface.activeLayer() yields <QgsVectorLayer: 'COSTUM LAYER' (ogr)>.
I would like to use 'COSTUM LAYER' ...
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Can't set Loaded Layer Name to input name in Load Layer into Project using QGIS Model Designer
I am designing a simple model to automate the loading and styling of new layers in a QGIS project. The idea is to use "Set layer style" to apply style settings from a QML file then load the ...
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Rotating features with multiple geometries in one layer using PyQGIS
I have a layer containing several small square geometries in QGIS. I want to tilt these ones by one to the same angle. So I wrote the following Python code for that, but it does not work properly. ...
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QGIS 3 - applying the same selection polygon to other layer
I have selected my large layer by using the "Select by polygon" option.
Unfortunately, I don't know how I could apply exactly the same polygon to another layer, which applies pretty much to ...
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TypeError when extracting vertices based on selection in QgsProcessingFeatureSourceDefinition using PyQGIS
I want to extract 70% of the vertices based on a selection but I get the following error code:
Traceback (most recent call last):
File "C:\PROGRA~1\QGIS32~1.1\apps\Python39\lib\code.py", ...
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44
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Deleting borders from merged layers in QGIS
I merged more layers together but I need to delete these borders. It is possible?
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QGIS new versions 3.28, 3.30... One part can not be selected, vertexes too, can't work with multi polygons, One part is "Hole lies outside shell"
I am currently stuck on working with polygons with QGIS versions from the new patches with the new styles (3.28, 3.30, maybe 3.26 too etc...)
When I used previous versions of QGIS, for instance 3.16 ...
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QGIS: Layer in layer tree list not visible
I have a new problem with QGIS 3.28.7 (OS Linux Mint 21.1):
I'm looking for a layer in the layer tree list in a QGIS project, and use for that purpose the search box (left side below) - the result I ...
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Every entity need to be so big in QGIS main display to fit big layout printer
In QGIS I am organising layer to print a map in tabloid format. I need to set my entities in a very big size for them to fit in the printer. Is there a way to just make match the format of the printer ...
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Mapbox GL JS custom symbol layer not visible when using external vector tiles
I've been using mapbox://styles/mapbox/satellite-v9 as the map style and adding a custom symbol layer for land parcel IDs. These show fine.
If I instead load with a different style https://api.os.uk/...
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Can I plot the individual style symbols/lines from a single layer to a PDF, and have the PDF have those different styles as different layers
I am working with a single layer. I assign the different features different attributes. Then I use categorized styling according to those attributes. In the layer window, these are easy to toggle on ...
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3
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239
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Performing the same mathematical operation on many attributes at once with QGIS
How to perform the same mathematical operation on many attributes at once? I have multiple numeric attributes and I would like to divide the value of each by the polygon area which is stored in a ...
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Exporting QML in QGIS Graphical Modeler
In QGIS graphical modeler, is it possible to set and export .QML extension of an output layer (adding .qml to the others extensions .shp, .shx, .dbf, ..)?
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Display the difference between two map layers in Google Earth Engine
I am a week 1 beginner at Google Earth Engine. I assumed that the subtract method would display the difference (the increased area) between my two layers: afterMap and beforeMap, but it does not.
var ...
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Using QGIS Geometry Generator to create labels between associated features in different layers
This question arose from a comment on this answer to Calculating distance between multiple points within buffer using QGIS.
I have followed the steps there, which use a one-to-many spatial join to ...
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How to preserve layers structure/groups when exporting GeoPDF from QGIS
I have a project with lines, polygons, points, GeoTIFFs and map services that are all organized in groups. QGIS can create a layered GeoPDF from them beautifully, but the resulted PDF won't preserve ...
