All Questions
186 questions
1
vote
0
answers
27
views
First field gets cleared (if time field) in QGIS Attribute Table
I recently noticed a strange bahavior in QGIS (currently working with version 3.34-7):
When the first field of a shapefile is named "time" (I regularly work with GPX files exported to ...
- 53
5
votes
2
answers
316
views
Deleting special characters from QGIS Attribute table
Is there a way to delete special characters such as *?
I've tried using replace and regexp_replace, but my version at least doesn't recognise special characters.
There are hundreds of fields, and I'm ...
- 157
4
votes
2
answers
229
views
Creating new field from another field in QGIS Field Calculator
I am trying to create a new field in QGIS where:
if the number in the field "DN"=2, then the new field (a text string) will say "veg"
and if the number in the field "DN"...
2
votes
1
answer
150
views
When deleting attribute from GDB file all the fields in the remaining attributes get deleted as well in QGIS
In QGIS 3.38.2 I have a gdb shapefile with many attributes, let's say A100, A200, A300 and with many fields. When I go to the edit through the "Open attribute table" and delete A200, all the ...
- 191
0
votes
1
answer
40
views
Expression for closest to zero value
I want to display the closest value to zero from a field in an attribute table from a QGIS layout without having to create a new field. Is it possible?
- 71
0
votes
1
answer
59
views
Fields that fill in automatically
I want to create a point layer with an ID field that fills in automatically as I digitize a geometry. It's possible? How can I do?
3
votes
3
answers
147
views
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 ...
- 8,356
2
votes
2
answers
269
views
Assigning unique ID to new points in QGIS
I want to add a new field to my feature attribute table. In this field, I want to generate a random ID (just a number, like 1, 2, 3, etc.) for every new and existing point I create on the map.
This is ...
- 101
0
votes
1
answer
42
views
Graduated symbology
I have opened a delimited text file with coordinates XY defined in two columns on the file plus two other columns with data and they are represented in QGIS as a point layer.
I want to symbolize the ...
- 71
0
votes
0
answers
45
views
Changed project from QGIS 3.16 to 3.24, now 'NULL' fields turn into '-9223372036854775808'
Been working on a digitizing project on QGIS 3.16.15-Hannover, as I like to use LTR versions for the stability.
But, 3.34 introduced an automatically incrementing UUID field, which I find useful.
My ...
- 175
0
votes
0
answers
43
views
Display information from a different layer in an attribute table in QGIS
I have two different polygon layers we'll call them A and B. I would like to create an attribute table with fields that list areas of A and B (calculated using the $area function in field calculator). ...
1
vote
1
answer
104
views
Setting a Boolean field to be empty
I have a layer with a Boolean field called bool.
I can set the field value to NULL, e.g. using the Field Calculator.
When printed via Python, the values are correctly shown as None:
>>> layer ...
- 11.3k
9
votes
1
answer
355
views
Using attributes tables as variables in QGIS
I work for a company where we use the same file when starting a project, with all the print layouts already configured, including the names/themes of the maps, since we usually need the same themes. ...
- 217
0
votes
0
answers
26
views
All values entered using fields with a list of values are transformed into (0)
All values entered using fields with a list of values are transformed into (0) how can we find back the selected values, we lost a lot of work and can't find backups.
- 1
2
votes
1
answer
99
views
Matching specific word character in QGIS Graphical Modeller
With the graphical modeller, I try to decode a set of codes:
Since the code '_zie' is also contained in the code '_p_zie', I get two matches for '_p_zie'.
How can I get two specific Word characters ...
- 185
1
vote
1
answer
363
views
Assigning new values based on the field calculator and "case when then" in QGIS
I would like to do conditioning in the attribute table consisting of the following action:
CASE WHEN "network" = icn_ref THEN '001|' ELSE '' END
|| CASE WHEN "network" = ncn THEN ...
- 11
4
votes
1
answer
727
views
Using get_feature function with attribute in QGIS
I am trying to wrap a get_feature with an attribute expression to perform the equivalent of a VLOOKUP in Excel. Using the form below I get a NULL result.
attribute(get_feature('pointst', 'when', ...
- 2,002
1
vote
0
answers
72
views
Separating data in name field so it can be filtered in QGIS
I have some information that I want to filter by some of the fields under the primary name field for ex: "gs_substation" or "gs_feeder_number". But they are unable to be filtered ...
- 11
1
vote
1
answer
102
views
Duplicating certain features based on symbol in QGIS Attribute table
In QGIS 3.28.8 I have downloaded the data for power lines in different parts of Germany from OSM. Some of these lines and cables have different voltages (see below). I can filter those with several ...
- 51
2
votes
0
answers
137
views
Returning field value based on expression on another field using QGIS expression
I want to return the value from one field ("Number") for the feature with the most recent timestamp ("Time") from within the current layer ('mylayer'). Or what's the number of the ...
- 2,002
1
vote
0
answers
70
views
Changing number to bigger than 999 in QGIS
In QGIS 3.28 on Windows, there is a shapefile originally created in QGIS that was imported and worked on in ArcGIS.
Now, when I reopen the file in QGIS, the real numbers have a width of 18 instead of ...
- 1,853
1
vote
0
answers
261
views
Get checkbox for Boolean field in attribute table
I have a dataset with a lot of Boolean fields.
In the attribute table, they are represented with text (either true oder false). If I click into the cell, I get the checkbox I also get in the attribute ...
- 727
4
votes
2
answers
224
views
Deleting contents of all entries in field in QGIS Attribute table
In QGIS, how can you delete all of the entries in a field in an attribute table? If you go to a particular entry in a field, you can delete that entry, but how can you delete all of the entries in the ...
- 569
-1
votes
1
answer
585
views
Converting string variable to number format without creating new variable using Field Calculator in QGIS
I have many variables which are of type string but contain in fact numbers.
In QGIS you can convert those strings to numbers by creating a new variable with the wanted numeric type (e.g. integer or ...
- 1,853
3
votes
0
answers
145
views
Saving attribute field comments when making memory layer permanent in QGIS Plugin
My QGIS plugin creates a vector layer (memory) with attribute fields that include comments. Comments are not saved when I "Make Permanent" the layer.
I have been able to build a QGIS Python ...
7
votes
3
answers
437
views
Using all columns to find the minimum with QGIS expression
I want to use aggregating functions (min, max, mean, ...) on all the attributes (= columns) within a row. In this topic Finding the minimum value of different columns in QGIS, this is done by calling ...
- 2,554
4
votes
2
answers
3k
views
Creating hyperlink in the attribute table using QGIS
My dataset contains a list of URLs. There is no hyperlink for the URLs to take me to Google Maps. Is there anything we can create to open the locations in Google Maps directly by clinking on the URL?
...
- 849
5
votes
2
answers
420
views
Converting column with category names to numeric codes in QGIS Field Calculator
I use the Field Calculator in QGIS to transform an attribute column with category names to numeric codes. I use the following expression:
CASE
WHEN "category" = 'Foo' THEN 1
WHEN &...
- 1,614
5
votes
1
answer
3k
views
Adding automatic numbering of the "id" field in QGIS
I'm working on QGIS 3.22.6 and I would like to find a way for my "id" column to be automatically numbered as geometry is added.
I am currently using maximum("id") + 1 within the '...
- 97
4
votes
1
answer
496
views
Creating a hyperlink in QGIS doesn't work
I have a text in an attribute table that contains a file path. I want a hyperlink to be displayed in the information about the object - in blue, underlined - as I saw in this tutorial: https://www....
- 317
1
vote
1
answer
442
views
Joining attribute tables without columns with the same name in QGIS
I would like to link the two attribute tables (see image). However, as far as I know, I need two columns with the same name for the link. Is there an alternative so that I can link the two attribute ...
- 11
2
votes
0
answers
91
views
Copying attribute table for each layer in QGIS
In QGIS I'm trying to edit attribute tables for a corn planting prescription. I have 50 layers (fields) that all need to have the same attribute table layout. Is there any way to create a template ...
- 29
5
votes
2
answers
216
views
Converting multiple fields with abbreviations to one field with full names in QGIS
I have a field with singular abbreviations ("BB", "BC", and "BG") that corresponds to a table with full names (catfish, rainbow trout). It ranges from 1-10 abbreviations ...
- 61
4
votes
2
answers
298
views
Filling several columns based on conditions from column in QGIS
I've got two additional columns that need to be filled with attributes that are based on values created in the field.
For example, if column "reproduction" = A2 then the value in the value ...
- 71
4
votes
1
answer
119
views
Filling attribute column with numbers 1-50 on repeat in QGIS
I have a large file of several hundred thousand polygons. It's too many to have an individual colour, so I want to create a column of numbers to which I can assign a random colour. So how do I create ...
- 531
5
votes
3
answers
734
views
Define a unique ID (serial number) based on values in a field
I'm trying to generate a unique serial number for a dataset I have, for example, something like this:
As shown, I would like to have a serial field, called SERIAL in this case, that increments based ...
5
votes
1
answer
755
views
QGIS Symbology - Display more symbols for each point depending on attribute numeric value
I have a point feature layer with some attributes. The numeric value of each attribute stands for the number of items of that attribute related to each point.
Is it possible in QGIS to display a ...
- 518
7
votes
3
answers
305
views
Is it possible to join the same table twice in QGIS?
Basically, I have the layers above:
As shown in the image, I'm trying to join the layer lines with the layer points two times in a row so the labels of origin_id and extremity_id appear in the ...
- 654
5
votes
3
answers
935
views
Permanently sorting table so that field of interest is sorted in the same order as the fid in QGIS
Using 3.22.13, consider a non-spatial GeoPackage attribute table containing one text field, named "field_a". This table has the following form:
fid field_a
1 B
2 A
3 X
4 C
How can I sort ...
- 8,356
3
votes
1
answer
746
views
Adding several attachments to one feature in QGIS
I want to add several files (for instance JPEG, DWG, PNG, etc.) as attachments in one polygon attribute field.
I created a new field with widget Type - Attachment. But it allows adding only one file ...
- 107
2
votes
2
answers
148
views
"Duplicating" the attribute table for many polygons in QGIS
I have about 45 polygons that refer to parcels of land and I want to create the same attribute table for all of them and edit the information/prices afterwards depending on the parcel.
"Joining&...
- 23
2
votes
1
answer
95
views
Filling in missing attribute data based on other features using QGIS expression
I have a survey form and some features (trees) will be grouped using the same "TreeNumber".
Hopefully, I can write an expression that means users only have to fill in most of the data for ...
- 2,002
2
votes
1
answer
268
views
How can I transform a StringList to one String
I have a column in Qgis with type:"StringList" eg
{ "name": "William", "height": "1.87", "age": 90 }, { "name": "Mary", &...
- 23
2
votes
1
answer
485
views
QGIS model: save downloaded file with filename based on one of its attribute values
Context
Using QGIS modeler (currently with QGIS 3.26.1) with the Download File algorithm, you can use a filename based on an expression and thus are able to give the saved file a name based on e.g. ...
- 74.9k
3
votes
1
answer
437
views
New field in attribute table with automatic yes or no
I have 2 different layers: one is properties and the other one is park buffer. I would like to add a field in the properties attribute table that says YES if "properties" and "buffer&...
2
votes
1
answer
759
views
Separate "date and time" field in "date" and "time" in QGIS
I have a column with date and time (yyyy/mm/dd hh/mm/ss) as string. I have the date field already, but the hour field is empty. How can I transfer the hh/mm/ss part to the hour field?
I am new to QGIS ...
1
vote
1
answer
142
views
Update Attribute Table on clipped shapefiles using QGIS
I would like to find a way to automatically update the attribute table for shps generated from the clipping tool. My interest is to get an updated area calculation. All my new shapefiles would ...
- 65
1
vote
0
answers
419
views
New field and joined fields not displaying in attribute table field dropdown in QGIS [closed]
I joined some fields to a layer and also added a new field. These fields display as expected in the layer's attribute table. Now I want to create an expression for one of the new fields but it doesn't ...
- 19
4
votes
2
answers
3k
views
Changing field length in QGIS [duplicate]
I want to update the string length for a shapefile layer in QGIS. I've tried opening up Layer Properties and clicking edit but it won't let me change it manually. Also I've tried using the field ...
5
votes
2
answers
1k
views
Getting list of values from column in QGIS
I have one "column D" with a b c values for my entities (1-2-3-4).
Something like that :
1. b
2. c
3. c
4. e
5. j
6. b
I would like to generate a list of each different value of "...
- 577