Questions tagged [select-by-expression]
The select-by-expression tag has no usage guidance.
22
questions
7
votes
2answers
121 views
Analysing point attributes within polygons
I'm using QGIS 3.4.4.
I have a polygon layer and a points layer. The points have the attributes district and streetname.
How can a check if all the points within a polygon have the same district and ...
4
votes
2answers
81 views
Selecting features whose text is equal to the text after certain word in QGIS
I have origin-destination lines and I'm looking for intra-city lines or lines whose origin and destination are in the same city.
A sample intra-city feature would be "Quezon_City to Quezon_City&...
4
votes
2answers
1k views
Selecting from selection with PyQGIS
The expression box has a handy "select from selection" button. Is there a way to emulate this with Python? I have the basic expressions down, but can't find a way to do this.
4
votes
1answer
56 views
Selecting by attributes on features sharing common value
I have a point vector with features sharing non-unique "ID"s. Each feature also has a "distance" field. I want to select among each set of features sharing the same "ID" ...
4
votes
1answer
53 views
Automate the selection of duplicate geometries with QGIS3
I have a layer of buffers calculated from watercourses. Each watercourse/buffer has a Strahler Order (0 to 7).
I need to delete overlaps between buffers order 0 and buffers order 1 to start, but ...
3
votes
1answer
119 views
Select features from the attributes table without opening it in QGIS
I have an attribute table with a vast amount of data in QGIS. I need to export only some of the features. Is there any way to select features without opening the attributes table?
3
votes
1answer
96 views
QGIS increase number of recent selections
is there any possibilty to increase the number of recent selections in the menu select by expression?
I can´t store more than 20 selections. If I create a new selection, the oldest selection is ...
3
votes
2answers
405 views
Selecting more features with “ILIKE” and “IN” operators using QGIS
I would like to select more features with expression in a specific field, which contains the name of the attribute (IN operator is useful). Moreover, the name could not be exact, so the ILIKE operator ...
3
votes
1answer
99 views
Selecting multiple rows in feature based on contents of list using PyQGIS
I am trying to select rows in a feature layer in QGIS based on the values in a list. I am using PyQGIS in the python console
If I just specify one item to find in a column called "gps_code", ...
3
votes
0answers
39 views
Iterate through list with numbers (as text)
I want to iterate through a list of coordinates and see it the last coordinate matches the first coordinate. The coordinates are stored in have a GeoJSON string:
'''{"type":"...
2
votes
1answer
68 views
Problem selecting features with % operator
I am having problem to select contours with the following expression:
"ELEV" % 0.05=0
As I understand this should select any contour that the remainder of the division by .05 is 0.
For ...
2
votes
1answer
132 views
Python script to set another layer inactive & select point by outside of boundary line?
I have two layers, "IDN_ALL" as Polygon and "Point_Link" as point.
"Point_Link" is the active layer. I want to select point data outside polygon data.
Code:
Layer1 = ...
2
votes
2answers
82 views
QGIS expression to check if a an attribute value of a feature exist in another attribute column
I have a shapefile with two fields 'Name' and 'CountyFacilityID'. I would like to create an expression to select all features where Name exists in the CountyFacilityID column for any of the features.
...
2
votes
1answer
43 views
Select by expression based on common ID
Background
I need to select features (parcels) from an official source based on a list with no geometries provided by a client. Both data sets have a common, unique ID (parcel number). There are about ...
2
votes
0answers
1k views
Select by expression only for selected features using PyQGIS [duplicate]
I'm facing a nested problem using PyQGIS (for QGIS master, but it can be replicated in any version of QGIS 2).
I have a vector layer with some selected features and with a QgsFeatureRequest I can ...
1
vote
1answer
34 views
Deleting lines crossing particular features from another layer using QGIS
I have two QGIS layers. Layer 1 has a floor plan with an attribute field holding feature types, e.g., wall, corridor etc. Layer 2 consists only the lines drawn between door centroids. I want to query ...
1
vote
1answer
57 views
Is there a way to sort the QGIS attribute table by date modified?
I was wondering if there was a way to sort the attribute table in QGIS Pi by date modified. I have been digitizing a large area and I need to delete the last 50-100 features that were digitized. My ...
1
vote
1answer
79 views
Create new shapefile for each unique attribute using for-loop with PyQGIS?
I have a roads shapefile. In its name field, I'll create a new shapefile per attribute. I already got each unique attribute under name. The for-loop that iterates over the unique attributes and ...
0
votes
1answer
46 views
Select and list all the adjacent features of a feature in ArcGIS
I have a shapefile of the Zips of California like the attached image. What I want is to select the adjacent/neighboring polygons (those touch the boundary) of each polygon in ArcMap and want to create ...
0
votes
0answers
27 views
How to performing selection by expression using QGIS
I am using QGIS 3.8.
I have a grid (hexagon) and a set of points.
I am trying to select the hexagons containing at least 1 point. So far nothing complicated. Except that sometimes my points overlap 2 ...
0
votes
0answers
47 views
Make Feature Layer / Select / Select Layer By Attribute “Get Unique Values” grayed out in ArcMap ModelBuilder [10.8.1]
I'm trying to extract road segments from a feature class through ModelBuilder in ArcMap 10.8.1 based on attribute queries, but the "Get Unique Values" button does not pull up a list of ...
-1
votes
1answer
49 views
Selecting a specific number of features in QGIS [duplicate]
I have a layer with several fields on its table and one of these fields is "population". Is there a way to select only the top 3 features with the highest population?
I imagine I need to ...
