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Results tagged with features
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user 99589
Use this tag when asking questions about a representation of a real-world objects on a map.
1
vote
Accepted
Why wont QGIS let me export selected features only?
As was already mentioned by @JGH, for a successful export, targeted features have to be selected. For more details about 'selecting features', please use the documentation. …
- 34k
1
vote
Getting number of features in the Attribute table using PyQGIS
Another option can be the allFeatureIds() method from the QgsFeatureSource class:
num_of_features = len(layer.allFeatureIds())
- 34k
1
vote
Selecting only N records from layer using PyQGIS
Another option is to use the "Random selection" tool for selecting N random features.
import processing
from qgis.utils import iface
layer = iface.activeLayer()
processing.run("qgis:randomselection", …
- 34k
5
votes
Searching for values in different layers without nested for loops using PyQGIS
Referring to several features
If only targeting features' ids should be requested, then one case get them via the getFeatures() method together with the QgsFeatureRequest() and setFilterFids(). … )
Referring to all features
In case when all features should be requested use simply the getFeatures() method:
layer = iface.activeLayer()
features = list(layer.getFeatures()) …
- 34k
3
votes
Returning current attribute name in QGIS Expression Dialog
Try using the following expression attribute($currentfeature, 'field_name') in the "Expression Dialog", see image below
In Record and Attributes
Function attribute
Returns the value of a specified a …
- 34k
1
vote
Difference between two features in same polygon in QGIS
If I understood the question correctly, you want to achieve two layers:
First that contains only overlapping features
Second that includes features with no overlaps
Let's assume there is a polygon layer …
- 34k
3
votes
Getting the bounding box for each feature in the source layer in QGIS
There is a possibility using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
Let's assume there is a polygon layer called 'test' with its corresponding attribute tables, see im …
- 34k
2
votes
Selecting values in attribute table which have alternate same values in two different columns
Use the "Select by expression" from the Selection Toolbar
with the following expression:
array_contains(
string_to_array(
concatenate_unique("fid_2")
),
"fid")
Usually fields …
- 34k
5
votes
Replica of point layer data from attribute value in QGIS
Let's assume there is a point layer called 'Centroids' with three features in it, see the image below. The field "Number" will be used for producing copies of each feature.
Step 1. … Apply the "Array of translated features" geoalgortihm (available in QGIS 3.4). In the 'Number of features to create' field use the following expression:
"Number" - 1
Step 2. …
- 34k
2
votes
Hiding data attributes rows in the Identify Results panel
This is the current result after using the "Identify Features" tool (Ctrl+Shift+I). … layer.fields()[index]
widget_setup = QgsEditorWidgetSetup(type, config)
layer.setEditorWidgetSetup(index, widget_setup)
Press Run script and get the final output (again after using the "Identify Features …
- 34k
5
votes
Accepted
AssertionError when applying expression to field value with PyQGIS
Another workaround was shown in this thread Setting attribute values using PyQGIS in an edit session.
layer=QgsVectorLayer(r"C:\Users\ANI\Documents\SIG\fossés\pythontest\mergedlinef1.shp")
features=layer.getFeatures …
- 34k
5
votes
Setting selected features in list without specifying their layer using PyQGIS
There is a special method for deleting selected features called deleteSelectedFeatures(). … Cheat sheet for PyQGIS
Deleting selected features using PyQGIS
Getting attributes of selected features using PyQGIS …
- 34k
12
votes
Rotating features with multiple geometries in one layer using PyQGIS
References:
Rotating features in memory layer using PyQGIS …
- 34k
5
votes
Looping every features pair with PyQGIS
the layer
features = [feat for feat in layer.getFeatures()]
# looping over pairs of features
for pair in pairwise(features):
feat1, feat2 = pair[0], pair[1]
print(feat1["id"], feat2["id"])
For … in the layer
features = [feat for feat in layer.getFeatures()]
# looping over pairs of features
for i in range(len(features) - 1):
feat1, feat2 = features[i], features[i + 1]
print(feat1["id" …
- 34k
6
votes
Accepted
Showing feature count in layer name in QGIS
single layer :
# imports
from qgis.core import QgsProject
# getting a layer by its id
layer = QgsProject.instance().mapLayer("LAYER_ID")
# getting layer's name
name = layer.sourceName()
# counting features … looping over each layer's id
for id in ids:
# accessing a layer by its id
layer = QgsProject.instance().mapLayer(id)
# getting layer's name
name = layer.sourceName()
# counting features …
- 34k