All Questions
Tagged with grouping fields-attributes
14 questions
2
votes
1
answer
94
views
Grouping points within counties and symbolizing their data as pie charts in QGIS
I need to combine/categorize points within different polygons while retaining some of their values. I've made up a scenario to try and simplify my problem.
The layers I have to work with are:
a point ...
- 29
5
votes
2
answers
572
views
Calculating mean with group by based on another column in QGIS Field Calculator
I have daily temperature data for several cities from January to December.
I'd like to calculate the average temperature per month for each city in a new column.
I have a column "city", &...
- 665
1
vote
0
answers
183
views
Group by multiple columns in QGIS array
I'm looking to create a figure with multiple rule-based symbologies. A graduated range within a category within a main category.
The only way I think that's possible is by adding categories, ranges to ...
- 11
2
votes
2
answers
2k
views
Filling attributes in one field based on second field with same values in QGIS
How do I fill the attribute with "SID_2" of the captured image where the ID of "SID_1" is NULL?
I'm using QGIS 3.22
- 29
3
votes
2
answers
813
views
Summarizing fields with same ID in QGIS Field Calculator
I am looking for a command, that sums the value of the field "Baulast" if they have the same "ogc_fid" and if there is a Number in the field "WEA". If there is no number ...
- 327
3
votes
3
answers
971
views
Counting and merging features based on attribute field in QGIS
I have a shapefile with a number of features, each with a field called "region". I want to count the number of features corresponding to each region. Outputting a shapefile with one feature ...
- 199
6
votes
2
answers
326
views
Counting fire occurences per county per year using QGIS
I wish to loop through this shapefile, and for each "COUNTY_NM", count the number of values corresponding to each "layer" value.
I want to output a CSV or equivalent which would be ...
- 199
8
votes
4
answers
2k
views
Adding unique ID for groups of items using Field calculator in QGIS
I have a set of string values in a shapefile's attribute column and want to assign a number to them in a way that each unique string gets an integer number, like this:
How do I do this using the ...
- 125
6
votes
3
answers
1k
views
Calculating Convex Hull based on attributes in QGIS
I have a layer with lots of (spatially grouped) lines - lines belonging to a group share the same value in a field.
I would like to create convex hulls around each of these groups using QGIS 3.8.
I ...
- 73
1
vote
2
answers
377
views
How can QGIS 3.X create atlas by a group field?
I have a line layer with 8 features and a field TYPE (5 features is type_A and 5 features is type_B). I want to create a atlas which output is two single image (one is grouped by typ_A with 5 features,...
- 213
3
votes
0
answers
215
views
Grouping neighbor points based on field sum in QGIS
I have about 14,000 points. These points have a specific field "time", an integer value, mainly between 1, 2 or 3.
I would like to split these 14,000 points into groups based on the "time" field ...
- 165
9
votes
3
answers
14k
views
How to group by attributes and give unique categories in QGIS?
I have features and each of them has an attribute about what it is. In my case, I have points representing trees and each tree has its species name as an attribute.
I would like to group them by ...
- 1,053
4
votes
1
answer
8k
views
How to get sum / total length of lines per polygon in QGIS?
I have a line vector layer which has multiple segments within individual polygons in a separate polygon layer. I have spatially joined the attributes so that each line segment now has the same ID as ...
- 530
1
vote
1
answer
882
views
Group attribute tables values for use with conditionals - Python
I would like to group values in a field in an attribute table. The field contains duplicate values. These duplicate values should be grouped based on duplicate values, the field would look something ...
- 622