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Results tagged with duplication
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user 88814
For questions related to creating, finding, or removing duplicate records or features.
0
votes
Accepted
Extract duplicate points
Use Select by expression with this expression: overlay_equals (@layer) to select all duplicate points.
Copy and paste the selected points as a new layer: Menu Edit > Paste Features As > ... [select …
- 74.9k
2
votes
Accepted
Intersect without duplication (QGIS)
You can use QGIS expressions with the function overlay_intersects( ), available since QGIS 3.16. Set the field type to string as the output will be formatted as text:
array_to_string (
overlay_int …
- 74.9k
5
votes
Removing duplicates from the Attribute table by expression in QGIS
Let's say you have duplicate values in field "value" and want to keep just one of the duplicate: the one with the smallest "id" value: use "Select by expression" with this expression:
array_contains ( …
- 74.9k
6
votes
Eliminating duplicates only if data is the same according to attributes
You have two options, depending on whether the points are actual duplicates (exactely the same point) or if the are "almost" duplicates (very close to one another):
Use Menu Processing / Toolbox / De …
- 74.9k
4
votes
Accepted
Highlight duplicates at nearest distance
You can use expressions to get for each point the id of the closest point with the same attribute value, like name.
You can use for this overlay_nearest function (available since QGIS 3.16, for older …
- 74.9k
1
vote
Removing duplicate features in QGIS based on two conditions
The solution
The basic idea is to create two fields with values 1/0 for true/false for the two conditions (let's call them cond1 and cond2). Concatenate the 1/0 values and convert them to a number. Th …
- 74.9k
1
vote
Accepted
Find and delete duplicate rows in matrix in QGIS 3.6
Avoiding duplicates
Creating duplicates should only be a problem if both origin- and destination layer are the same. For different layers, only connections from input to destination are calculated. As …
- 74.9k
1
vote
Why highlighting duplicates does not work in QGIS?
Use Conditional Formatting (1st screenshot) or Select by expression (2nd screenshot) with this expression (replace value twice by the name of the field where you want to find duplicates).
count (value …
- 74.9k