21
votes
Accepted
Showing the number of currently selected layers in QGIS
You can use this script. It adds a toolbar as seen in the image and shows how many layers are selected.
label = QLabel("Selected Layers Count:")
count = QLabel()
tree_view = iface....
- 74.7k
15
votes
Showing the number of currently selected layers in QGIS
To extend the great solution by @Kadir Şahbaz, you could do something like this to get a count per group:
p = QgsProject.instance()
root = p.layerTreeRoot()
view = iface.layerTreeView()
## TOOLBAR
tb ...
- 14.2k
11
votes
Accepted
Adding different types of geometry to layer in QGIS
If you mean adding them to a QGIS layer, the answer is 'No'. It is not possible. This is the nature of the QGIS layer. But somehow (maybe by a script) you may export layers, which have different ...
- 74.7k
11
votes
Rotating features with multiple geometries in one layer using PyQGIS
There are several things that I would improve:
do not forget to start/startEditing, end/endEditCommand(), and commit/commitChanges() editings
use the setGeometry() method properly, otherwise the ...
- 29.9k
10
votes
Accepted
Hiding/showing layers in legend does not work in QGIS standalone
QgsLayerTreeMapCanvasBridge must be in global scope. But you define bridge in add_legend method's scope. Therefore, variable bridge is gone after add_legend finished.
One of the solutions:
Add bridge ...
- 74.7k
10
votes
Points not showing on map on QGIS
Look at the layer's order, it is because OpenStreetMap layer is covering everything. Just drag down the OpenStreetMap to the bottom of the layer list. It should fix your problem.
- 2,430
9
votes
Accepted
Zooming to each vector layer extent, one at a time, using PyQGIS
You can solve your issue using QTimer which controls when to execute functions and it's asynchronous, i.e., it allows other functions to continue to run (think of a map.refresh()) while waiting some ...
- 74.7k
8
votes
Accepted
Copying layer styles using PyQGIS
You could use the setActiveLayer() method of the QgisInterface class.
One way to set up an iterable object containing source and destination layers is to use a list of sub-lists or tuples, where the ...
- 20.2k
7
votes
Accepted
Exporting selected attributes to Excel from specific layer using PyQGIS
No need to programmatically select your layer in the layers panel- you can access the layer you want to export simply by its name. To export the layer to a .xlsx, you can call the 'Export to ...
- 20.2k
7
votes
Accepted
Filtering Data to Categorize Points in QGIS
For use of 'NULL' you will need to use 'IS' not '='.
Your query will become:
if("FIELD C" IS NULL,1,2)
- 2,843
7
votes
Adding non-spatial SQLite query to QGIS
There are at least four options: the three options before loading the data as a layer, the last one after the layer is loaded.
Option 1: Data source Mananger Filter
Use Data Source manager to load ...
- 63.1k
7
votes
Changing feature in one layer with feature from another layer in QGIS
You can select the feature, then choose Edit > Copy Features and paste it in the target layer with Edit > Paste Features.
Ensure the target layer has editing enabled.
As @J.R commented, delete ...
- 14.2k
7
votes
Generating geodata models for layers and their attributes in QGIS
Here is an automated solution that requires no expression and no manual intervention. It makes pages and adds necessary text as HTML table to the related pages automatically. Just change LAYOUT_NAME. ...
- 74.7k
6
votes
Accepted
QGIS delimited text layer is not visible
You have the X (longitude) & Y (latitude) coordinates reversed. And the coordinates are DD (decimal degrees) not DMS (degrees, minutes, seconds)
- 64k
6
votes
Getting field names of layer using PyQGIS
Another approach is to use the attributeAliases() method:
Returns a map of field name to attribute alias.
from qgis.utils import iface
layer = iface.activeLayer()
field_names = list(layer....
- 29.9k
6
votes
Accepted
Changing columns position in attributes table using PyQGIS
The order of the fields must be ordered in the qml file as in the second example. If you add the file RBAL_BYSAT_TEMP.shp to QGIS by drag-and-drop you will see that the order is as you want. Applying ...
- 74.7k
6
votes
Separating columns of layer and exporting set of columns in a new QGIS layer
If its only a few and automating it is too much hassle, use Layer... Save As.. and choose a name and select the columns you want to save in the dialog:
- 61.5k
6
votes
Rule-based parent child symbol layer view in QGIS
Sort of workaround solution:
Create a Virtual layer through Layer > Add Layer > Add/Edit Virtual Layer with the following SQL code :
WITH RECURSIVE org(fid, unit, parent, level, geom) AS (
...
- 15.5k
6
votes
Accepted
Rule-based parent child symbol layer view in QGIS
A very interesting questions, that no doubt is beyond built-in functionality. I would split this problem in to 3 parts.
To go from your data to a structure that is appropriate for a rule-based tree ...
- 247
6
votes
Prioritise label by field containing data importance in the data QGIS
You need to use data-driven label priority, in the layer's Label settings, Placement sub-tab.
There's a slider for Priority there which sets priority for all the label of the layer, but to its right ...
- 7,678
6
votes
Activating two layers at the same time with PyQGIS
The best way to work with any non-trivial implementation of a QgsMapTool is to create a sub-class. Below is a fairly minimal example. The way this deals with changing between source and target layers, ...
- 20.2k
6
votes
Accepted
Using QGIS Geometry Generator to create labels between associated features in different layers
Prerequisite
For this solution to work, the point layer must have a field (in this example called buffer_id) that contains the id of the joined buffer polygon. The solution was implemented in QGIS 3....
- 14.2k
6
votes
Accepted
Performing the same mathematical operation on many attributes at once with QGIS
Another option is to use Menu Processing > Toolbox > Refactor Fields. In the field Source Expression, include your mathematical operation. In the field "Name", you can change the field ...
- 63.1k
6
votes
Accepted
TypeError when extracting vertices based on selection in QgsProcessingFeatureSourceDefinition using PyQGIS
I could get the same error:
Traceback (most recent call last):
File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\code.py", line 90, in runcode
exec(code, self.locals)
File "<...
- 29.9k
5
votes
Accepted
Exporting points as points, text as text (when exporting to svg)
You have to set this while exporting to SVG:
Then after opening the SVG in AI you have to ungroup the exported text and points:
- 9,530
5
votes
Accepted
QGIS Reproject a set of points in CSV to another CRS
Load the csv as a Delimited Text
As mentioned in the comments by J.R. - Do some visual checks if the data is where it should be - if they are off check the CRS or if Lat/Lng are swapped etc.
Export ...
- 2,191
5
votes
How to export layer without losing formatting in QGIS
You can also save your data in a geopackage. In a geopackage, you can also save the symbology of the layers.
So at the end, your colleagues just need to open the layer, and the default symbology is ...
- 1,544
5
votes
Reprojecting layer using PyQGIS
If you do not want to use Processing Tools you can do it like:
layer = iface.activeLayer()
source_crs = QgsCoordinateReferenceSystem(layer.crs().authid())
target_crs = QgsCoordinateReferenceSystem(&...
- 32.6k
5
votes
Accepted
Interactively create route that snaps to route layer in QGIS
QGIS has en editing tool call Automatic tracing.
Here the documentation section of this tool :
Enable the Tracing tool (in the Snapping toolbar) by pushing the icon or pressing T key.
Snap to a ...
- 15.5k
5
votes
Interactively create route that snaps to route layer in QGIS
Expanding the solution by @Dror Bogin you can use this expression together with array_foreach() to include not just two points, but any number of points - in the following example points 1 to 9 (first ...
- 63.1k
Only top scored, non community-wiki answers of a minimum length are eligible