Questions tagged [select-by-expression]
The select-by-expression tag has no usage guidance.
61
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Deselecting duplicate records in QGIS Attribute table
Several SE-GIS posts describe how to identify duplicate records, such as Identifying duplicate attributes in field using QGIS.
I would like to extend this concept by unselecting any duplicate records ...
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58
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QGIS select by expression Modeler
I'm trying to build a model which should select polygons based on selected polylines. The polygons share attribute values with the polylines. In this case the field "Outlet" (polygon) ...
2
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1
answer
104
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QGIS: Select by expression on the same layer with condition
What I am trying to achieve is selecting the lines that have the value of the field "Heizlast in kW" = 0 + the lines that touch it (like the selection in the picture above).
Using the ...
- 189
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69
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Selecting features based on minimum overlap with another layer in QGIS [closed]
I have a "sites" vector layer with 300 polygon features and a "heathland" vector polygon layer, showing the locations of heathland areas. I am looking for a way to select all ...
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How to only select contiguous parcels that have the same ownership AND exclude those owners that have parcels that are non-contiguous (QGIS)
I have a shapefile containing parcel data for multiple counties, and I'm trying to narrow this dataset with the following conditions:
1.) Identify owners with contiguous parcels
AND
2.) Exclude owners ...
2
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1
answer
135
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Selecting duplicate IDs in QGIS
I have a .csv file in QGIS with a list of water meters and their associated property IDs. Some property IDs have >1 water meter. I want to run a selection query to find all the duplicate property ...
- 175
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QGIS Model Designer - Select by expression doesn't work
I try to do a simple model with the Model Designer of QGIS and I have an issue with the algorithms Select by expression.
And when I want to check the validity of the model the explanation is just : ...
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148
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Selecting top two features with longest length in the line vector file in QGIS
I have a line vector file and I need to select two lines with the longest length using expression. I am familiar with selecting the line with the longest length:
length($geometry) = maximum(length($...
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Save vector layer features into separate layers, based on combination of two attribute values: correct QGIS expression
I am doing a lab worksheet and I am having a hard time figuring out what to put in in the expression box.
GENERAL STEP: You need to identify Aspen and Birch (Select by Expression) and export these ...
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2
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237
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Selecting Features by Expression in QGIS
I have a set of features in a single layer that have been created during various periods of time.
In a layer attribute table, there is a column kreirao_datum which means created on a date
I would ...
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37
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How to select by expression multiple rows in attribute table [duplicate]
I have a large number of parcels to select, which id number are in Field Name "numberofparcel". How can I make an expression with group of parcels to select by their id number? I use QGIS 2....
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Expression writing in QGIS/Select by expression
I'm trying to write formulas/expressions for selecting purposes. I want to create a fixed table in a report layout, and for let's say one particular cell, I'd like to retrieve data from a SELECTED ...
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1
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46
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Selecting everything of one cell value using PyQGIS
I'm trying to make a selection using PyQGIS.
The short snippet I'm working with is
hej = iface.addVectorLayer('rs_map_Ale.shp', "", "ogr")
hej.selectByExpression("KOMMUNNAMN=...
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416
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How to select multiple values (features) in separate columns (QGIS) [closed]
Two parts to this question.
Part 1
I'm trying to select by expression all rows (features) that have a particular value across multiple columns. So, for example, I want to select all features that have ...
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Select points within a polygon based on attribute value within polygon and point attribute values
I have a two datasets - a polygon dataset of buffers around a point and a point dataset. The polygon dataset has an elevation value (assigned from the point on which the buffer was created) and each ...
