56
votes
Accepted
Filtering features in other layers of QGIS Atlas
Indeed, you need to use rule-based symbology to achieve what you want.
You need to create a rule for what you want to show, and ELSE rule for all others.
In the ELSE rule, deselect the symbol ...
- 14k
31
votes
Displaying only selected features on map in QGIS
This is now possible using just selections and a rule-based symbology.
This requires the Expression Plus plugin (for QGIS 2.x. 3.0 has the functionality built in).
Create a rule based symbology with ...
- 16.3k
30
votes
Displaying properties of GeoJSON in popup on Leaflet?
The line where you create and bind your popup should have been included in the onEachFeature option of your L.geoJSON factory.
var layerGroup = L.geoJSON(data, {
onEachFeature: function (feature, ...
- 7,143
23
votes
Reading feature class in file geodatabase using R?
As already posted in this answer, this now also works very nicely with sf:
require(sf)
fc <- sf::st_read("C:/path/to/your/filegeodatabase.gdb", layer = "some_featureclass")
But writing into a ...
- 953
18
votes
Accepted
Updating text column of selected features in QGIS
make sure the layer is in edit mode (otherwise changes will not happen)
Select features to change (however you like)
then open attribute table
select the attribute to change
type in what you want it ...
- 79.9k
18
votes
Accepted
Getting the bounding box for each feature in the source layer in QGIS
In the Processing Toolbox (Processing Tab > Toolbox or Ctrl+Alt+T) you will find a tool called Bounding boxes. This will achieve what you want.
If your layer contains some multipart features you ...
- 2,843
17
votes
Applying categorized symbol to each feature using PyQGIS
For those who'd like to try the code above for the PyQGIS3 version, here is my adaptation (it works for the 'active layer' if run from the console ...).
# provide file name index and field's unique ...
- 301
17
votes
Accepted
Copying & pasting multiple values from one feature to other features in the same layer in QGIS
There is the AttributePainter plugin (https://plugins.qgis.org/plugins/attributePainter/) for this.
Usage:
Click on Pick source feature and select a sample feature on the map.
On the table, a ...
- 74.7k
16
votes
Accepted
Can someone help me identify this part of the map?
Here you find the map including the legend. The legend is in German, but I am German, so I tried to translate it as precise as possible.
I think (and please @Giancarlo correct me, if you disagree):
...
- 894
16
votes
Accepted
'Could not load source layer for INPUT: layer not found' error when running QGIS algorithm on selected features using PyQGIS
You need add the layer to project.
For add without showing it use:
QgsProject.instance().addMapLayer(layer1, False)
Example using only one layer:
layer1 = QgsVectorLayer(r"C:\test\grassland....
- 7,780
16
votes
Accepted
Getting dictionary for each feature with their attribute values using PyQGIS
The QgsJsonUtils class has exportAttributes method for getting attributes as a dict.
Solution 1:
Making a dictionary including feature "id" as key, attributes map as value:
{feature1.id: {...
- 74.7k
14
votes
Getting number of features in attribute table using PyQGIS
Yes, there is a direct way to access the number of rows of your attribute table. Just call featureCount() method from your layer object:
num_of_features = layer.featureCount()
- 35.9k
14
votes
Accepted
OpenLayers: Get Coordinates of drawn features
The drawn feature are added to the layer named vector. See draw interactions constructors.
// Get the array of features
var features = vector.getSource().getFeatures();
// Go through this array and ...
- 1,129
14
votes
Accepted
Tying visibility of features to zoom level by attribute in QGIS
You can change the style to be rule-based (it will preserve the classes if a categorized style was previously set), and there you can control the display scale of each class/rule.
- 39.8k
13
votes
Accepted
Counting number of selected features in QGIS
Look at the header of the attribute table, it tells you the total number of objects in tables, as well as the filtered and selected ones.
- 378
13
votes
Accepted
Is there a maximum number of features that QGIS can save into a shapefile?
Officially, .shp and .dbf files are limited to 2GB. Using GDAL Shapefile driver this can be exceeded, but as stated on this site, this is not recommended due to compatibility issues (See point #Size ...
- 32.6k
13
votes
Deleting features in PyQGIS?
Decide either to work with the data provider or the layer, not both
Working directly on the layer has the advantage, that all internals of QGIS are notified about changes/deletions, whereas changes ...
- 27.5k
13
votes
Determining number of vertices of selected object in QGIS 3
You can use the following script in QGIS Python Editor. Select a layer, run the script and select a feature.
def n_vertices(selected, _, __):
n = len(selected)
if n == 1:
g = ...
- 74.7k
13
votes
Accepted
Selecting multiple features by ID-attribute from list using PyQGIS
Use this way (without for loop):
id_list = [1, 2, 5]
layer.selectByExpression("id in {}".format(tuple(id_list)))
- 74.7k
12
votes
Accepted
Applying categorized symbol to each feature using PyQGIS
To draw a layer with a categorized renderer you first should create appropriate categories. A category needs value, symbol, and label. If you know the values at design time you may define these 3 ...
- 4,538
12
votes
Accepted
Merging spatially separated polygons into one feature in QGIS
Check the corresponding geoalgorithm in the Processing Toolbox (Ctrl+Shift+T).
For QGIS 3 : "Promote to multipart"
For QGIS 2 : "Singleparts to multipart"
- 1,825
12
votes
Accepted
Creating Virtual layer in QGIS that shows only features in extent
The trick is to create a function that access QGIS graphical interface, and that is piped to the query of the virtual layer.
Open a function editor (from anywhere, including from field calculator) ...
- 39.8k
12
votes
Accepted
Getting ordered list of IDs of selected features using PyQGIS
Use this script:
selection = []
def selection_changed(selected, deselected, clearAndSelect):
global selection
# If the user deselects feature(s), remove ID's from list
if deselected:
...
- 74.7k
12
votes
Accepted
Determining number of vertices of selected object in QGIS 3
num_points($geometry) returns the number of vertices of the current feature.
- 15.5k
11
votes
Displaying properties of GeoJSON in popup on Leaflet?
Build a simple popup content for any properties in a simple way, in one line:
var layer = L.geoJSON(data, {
onEachFeature: function (f, l) {
l.bindPopup('<pre>'+JSON.stringify(f.properties,...
- 396
11
votes
Accepted
Feature Count in Legend (QGIS 2.18.2)
You may try a right click on your layer and then chose to Show Feature Count (green on figure):
- 9,556
11
votes
Accepted
Running QGIS algorithm with selected features from layer using PyQGIS
For only selected feature use the QgsProcessingFeatureSourceDefinition class.
Code below with the input of selected features only:
import processing
input_vlayer = 'Some path'
intersect_vlayer = '...
- 7,780
11
votes
Getting dictionary for each feature with their attribute values using PyQGIS
The snippet below should help you. It just prints a dictionary for each feature to the console, but you could do something else with the feature attribute dictionaries if you wanted.
from qgis.utils ...
- 20.2k
11
votes
Accepted
Sorting records by attribute in shapefile using PyShp
The script you need:
features = shapefile.Reader("c:/data/cities.shp").shapeRecords()
features.sort(key=lambda feat: feat.record["NAME"]) # or ["POPULATION"]
...
- 74.7k
11
votes
Tying visibility of features to zoom level by attribute in QGIS
Get ready for the probably most useful option when it comes to symbology: data defined override
My suggestion: For each of your classes, set the line type based on your current scale, e.g. if(@...
- 15.5k
Only top scored, non community-wiki answers of a minimum length are eligible