Questions tagged [qgsfeaturerequest]
QGIS API class to request for features to a vector layer.
12
questions
0
votes
1
answer
31
views
Requests Python module in QGIS return nontype or empty CSV
I am using the Requests Python module to query a 3rd party API that returns a polygon of an address, the returned CSV returning only part of the header, while it is working fine when using the code ...
1
vote
3
answers
129
views
Adding and filtering layer with map canvas extent using PyQGIS
I'm creating a small QGIS3.16 plugin with PyQGIS.
I'd want to add a vector (PostGIS) layer to QGIS, and immediately filter it with the QGIS canvas extent.
I found the QgsFeatureRequest(rectangle:...
- 369
1
vote
0
answers
105
views
How can I made requests (QgsFeatureRequest) or selections (selectByExpression) from a list of QgsFeature?
I've got a processing algorithm that does a request to select some features that correspond to the incorrect filling of the attributes. It reads a JSON file containing a description of expression (...
3
votes
1
answer
99
views
How to select specific fields using getFeatures() without getting all of them in QGIS-3.10
So I'm trying to convert code from ArcGIS to QGIS. The part I am at right now is converting:
lst_fields = ["full_id", "osm_id", "osm_type", "boundary", "is_in", "leisure", "name", "type", "landuse"]
...
- 291
1
vote
1
answer
131
views
Printing how many features satisfy a QgsFeatureRequest (QGIS 3)
I have a QgsFeatureRequest() that filter all the features by an attribute.
Is there any python function that could tell me how many features were filtered?
I know I could create a list with this ...
- 621
2
votes
1
answer
215
views
How to use the ExactIntersect flag for QgsFeatureRequest() object
I have two layers, a polygon_lyr and a line_lyr. I want to use a QgsFeatureRequest() for the line_lyr.getFeatures() but instead of returning the lines which intersect the bounding box of a polygon, I ...
- 537
1
vote
0
answers
172
views
QgsFeatureRequest() with a string search within QGIS3 Processing Script [closed]
I'm trying to select features using a string comparison within my script using a QgsFeatureRequest() and getFeatures()
roadsRequest = QgsFeatureRequest()
roadsExpression = str(roadsIDField[0]) + ' ...
- 111
1
vote
1
answer
171
views
QGIS 2.18: Filter line-layer by QgsExpression
I have a line layer on which I want to run a filter within a python script.
I am trying to achieve this via QgsExpression and QgsFeatureRequest.
Below you see the same filter that I want to apply in ...
- 675
3
votes
1
answer
239
views
QGIS 2.18: Speed up QgsFeatureRequest in Python Script
I have two input layers. The first one is a line-layer named "graph" and the second one is a point-layer named "nodes".
The "graph"-layer:
The graph layer holds 177350 line features which are ...
- 675
1
vote
1
answer
66
views
QgsfeatureRequest - Store result indexes
I recently posted a question. My original goal was to find a way to determine on which side of a line points are located. @xulnik answered this question with two codes. One returns a binary [0;1] ...
- 453
2
votes
1
answer
317
views
How to refresh a layer after filter features in pyqgis
When I queried some features using QgsFeatureRequest().setFilterExpression() in pyqgis,I want to make the current layer just only show what I queried without creating a new memory layer. Just like you ...
- 65
1
vote
0
answers
64
views
How to set flags when re-use QgsFeatureRequest object
I have a standalone PyQGis application that is working fine. When I query a vector layer via QgsFeatureRequest class, I would like to instantiate one object and reuse it. But I am not sure how to set- ...
- 1,077