All Questions
Tagged with fields-attributes qgis
166 questions
33
votes
3
answers
36k
views
Understanding "Join Attributes by Location" in QGIS
I wonder if there is somewhere an explanation for the parameters that can be set when running the Algorithm "Join Attributes by Location" in QGIS 2.18.
I had a look here:
Documentation QGIS Testing |...
- 3,440
16
votes
3
answers
39k
views
Summing data from column in QGIS Attribute table
I'm working with population data, and I have an issue when it comes to knowing the sum of a population inside the attribute table.
In my attribute table, I'd like to add all the numbers in the red ...
- 1,042
8
votes
2
answers
14k
views
Spatially joining polygon fields onto point layer in QGIS
I have gridded depth points in CSV format that I'm trying to add other map data to, in additional columns. I've tried joining fields, hoping that I could link the shapefile data to the CSV, but when I ...
- 1,089
52
votes
9
answers
59k
views
Identifying duplicate attributes in field using QGIS
I have a point shapefile with thousands of points. It has an "ID" code field that is supposed to be unique. Every now and then the data entry clerk wrongly type the "ID" creating ...
- 523
47
votes
10
answers
114k
views
Determining the centroid of polygons in QGIS
I have a polygon vector and I want to quickly attain the centroid of this polygon for insertion in a text document. I am working with QGIS. I searched through other questions and although some are ...
- 781
29
votes
4
answers
92k
views
Merging/Dissolving polygons by Common Attribute Field in QGIS?
I have joined corresponding Local Enterprise Partnerships table data into a polygon shapefile containing UK Local Authorities.
How do I Dissolve or Merge the the Local Authorities polygons by ...
- 471
29
votes
4
answers
59k
views
Reading attribute values using PyQGIS
What is the way to get the information contained in the attribute table, say in column 2, row 2 using PyQGIS?
- 309
16
votes
4
answers
45k
views
Changing data type in QGIS Attribute table
I have county data in which the "FIP"s (actually State "FIP"s and County "FIP"s combined). I have data imported as CSV with the same "FIP"s data titled '...
- 301
9
votes
2
answers
30k
views
Why can't I edit attribute table imported through 'text as layer'
I imported the coordinates from an Excel table. They show as single points as intended. Now I want to add columns to the attribute table, but I'm not able to edit it. I wanted to import the following ...
- 93
96
votes
5
answers
157k
views
Renaming attributes/fields in shapefile attribute table using QGIS
I would like to rename some fields in my attribute table:
Like rename "XRF_N3"in something else. It seems quite a easy issue but I don't find any information about how can I do that.
- 2,078
52
votes
5
answers
38k
views
Change style properties of several layers simultaneously?
I'm working on bulk data. I have a few hundred GeoTIFF images imported into a QGIS project, and I'd like to modify their layer properties - things like the no-data-value, transparency of certain pixel ...
- 641
32
votes
8
answers
29k
views
Getting list of distinct values from shapefile field using QGIS
I have a shapefile whose features I can filter by specifying a where clause in the query dialogue. F.x. I have a field named "city_name" and by stating "city_name" = 'London' in ...
- 550
30
votes
5
answers
60k
views
Grouping and counting attribute data in QGIS
I want to group and count features with the same code attribute value.
I can classify the data and enable feature count in the layer list but I cannot get counts in the attribute table.
- 331
17
votes
3
answers
25k
views
How to split text attribute by characters in QGIS?
Is it possible to make a new column, for example named "Test" and store the first part of the column "Name" split by -?
See below how it should look like:
- 189
11
votes
3
answers
15k
views
Getting attributes of selected features using PyQGIS
Could anybody provide an example how to get the attributes of selected features?
I tried the following code in the Python Console : but I'm stuck at the point where I'd like to get the attributes:
...
- 261
10
votes
5
answers
26k
views
Changing fields order in QGIS
I have to draw several stuff and input the data, all the layers have the same data fields but some require 2\5 attributes to be filled.
Is there a way to change the order of those fields to be on top ...
- 509
9
votes
1
answer
23k
views
Summarizing column in QGIS field calculator?
I have data with a column containing a number value, and I want to divide the value of each feature by the total sum of all the values in the column (to get a percentage).
So I would like to know if ...
- 2,666
6
votes
1
answer
368
views
Attribute subdomain in QField/QGIS
I have a point layer with the attribute/field:
kingdom
with a value map widget so I can choose the values: Tree or mammal.
And a second field:
Species (where I will register: Pine, Oak, Deer or Fox)...
- 77.8k
6
votes
2
answers
1k
views
Modifying width and precision of database using QGIS?
I have a database in txt format made of several columns of real numbers. Two column are integer, 17 are real (rounded to the first decimal) and 17 are real rounded to the second decimal.
If I import ...
- 179
24
votes
10
answers
14k
views
Sorting by multiple fields at same time in QGIS?
Is it possible to sort multiple fields at the same time in QGIS?
For example, I'd like to sort a table by state name, and then within each state, sort by county name.
This would be the same as ...
- 8,356
11
votes
3
answers
16k
views
Merge lines with the same 'name' attribute on QGIS?
I have a shapefile with a few thousand lines, each is a street segment. I'd like to merge all features with the same 'streetName' attribute into a single attribute. I only really care about the name ...
- 111
11
votes
4
answers
13k
views
Looking for QGIS equivalent of ArcGIS "Summarize" [duplicate]
In ArcMap, the user can create a table that groups the field values using summarize field tool (as shown below)
How can I create a table that summarizes field values in QGIS?
- 389
8
votes
1
answer
3k
views
Creating variable distance buffers in QGIS
I would like to create variable distance buffers for some points in QGIS 3.4.
I have seen in previous posts that there used to be a tool for this in older versions of QGIS, but that this tool wasn't ...
- 351
7
votes
1
answer
5k
views
How to style a vector layer in QGIS using hexadecimal color code stored in attribute?
I have a polygon shapefile storing hexadecimal color codes in a specific attribute.
gid | label | color
---------+-----------+------------
1 | Crops | #FF5F2C
2 | Forest ...
- 2,720
6
votes
1
answer
11k
views
After performing table join all the fields are "NULL" in QGIS
Within QGIS, I joined .dbf table containing population data to a shapefile of Census tracts.
The join field is called "GISJOIN" in both the target table and the shapefile's table, and this ...
- 323
3
votes
1
answer
9k
views
Exporting QGIS contour attributes in DXF file?
I have a .tiff data file that generates contours in QGIS. I save it as .dxf. The contours don't have any attributes or data. That's bad, because I want to make a 3D landscape in Revit using the ...
- 31
34
votes
3
answers
20k
views
How to easily edit attribute data using Regular Expressions?
I am writing a tutorial for MSc students that uses QGIS.
One of the tasks requires the attribute data to be modified
(see pdf draft of tutorial here if interested ).
The question is how to get them ...
- 4,274
18
votes
2
answers
19k
views
Creating drop down list with values in QGIS
I want to show a drop down list in the feature attributes dialog.
I have three different building zones. The hot Wohnzon A, B residential zone and residential zone C. Now I have an attribute called ...
- 623
18
votes
4
answers
19k
views
Filter features based on their attributes using Python
How to get features by their attributes (similar to 'IQueryFilter' in ArcObjects) in QGIS using Python? Instead of getting all features and filter it manually, is there any option to use where clause ...
- 1,051
17
votes
2
answers
24k
views
Summing values in field using QGIS
Using QGIS 1.8, I've got a shapefile with an integer field called "AREA" and I'd like to sum the values which are in this shapefile.
Does anybody know how to?
- 171
8
votes
1
answer
9k
views
Is it possible to increase Output Field Name length beyond 10 characters?
When creating a new Column, the default value for the length of the name is 10. Using the Field Calculator via the Model Builder, I want to include the names of regional areas into the columns which ...
- 76.3k
7
votes
4
answers
4k
views
Fill with @row_number based on group field in QGIS 3
Is there a way to fill the table with a row number so that count will restart as new group (identified by a separate column) starts? As a result, "row number" column will restart the count ...
- 695
7
votes
3
answers
896
views
Is it possible to have the attributes fields already filled from the previous object?
I need to create a lot of points with lots of attributes, but most of the fields are the same, so I don't want to edit all the fields all the time. Is there a "remember previous fields" function ...
- 71
6
votes
3
answers
2k
views
Creating QgsFeature with default attributes using PyQGIS
I have a polygon layer loaded from PostGIS database. This layer has a default value for the first column. I can create a new feature set that attribute to some predefined value with:
newFeature = ...
- 268
4
votes
3
answers
4k
views
Copy geometry from one layer onto attributes of another?
I have two polygon layers, A and B, that have the same features but totally different attributes. I want to use the attributes from layer A, but I want them to have the more accurate geometry from ...
- 1,314
3
votes
2
answers
4k
views
Updating polygon areas in QGIS?
I'm using QGIS 2.6 and regularly update a shapefile layer to indicate felling progress. However, if I edit the nodes of a polygon, save the layer out then look at the Attributes table the area shown ...
- 199
1
vote
2
answers
570
views
Getting attribute data from one dataset to another
In the image below you can see two shapefiles: NYC building footprints (outlined), and underneath a PLUTO shapefile rendered with a categorized blue gradient using the "Floor Number" column. The ...
- 403
23
votes
8
answers
54k
views
Deleting fields using QGIS
When is the option to delete field in an attribute table enabled in QGIS?
I'm in editing mode and still am not able to delete a field.
- 5,618
17
votes
3
answers
906
views
Sorting attribute table by hidden column in QGIS Print Composer
In a QGIS 2.18.20 attribute table I have some values with random numbers, but at the print composer I want to show them with order (clockwise). So I made a new integer column, and added numbers with ...
- 741
17
votes
3
answers
20k
views
Changing position of columns in QGIS Attribute table
If I have an attribute table with columns A, B, C, and D, is it possible to move the columns to different positions, say: B, C, A, D?
When making a new column with the Field Calculator it would be ...
- 1,015
17
votes
5
answers
15k
views
Converting string field into date field in QGIS
In QGIS I have a layer with points which represent the fatal road accidents and the field "dates_14_D" contains their date but its type is string. I would like to convert this string field ...
- 792
15
votes
7
answers
32k
views
Changing field length using QGIS
I have a shapefile I made in QGIS 1.7.4. One of the fields is a String of length 80. I'd like to make the field accept longer stings, but I can't figure out how to change its length.
How do I do this?
- 1,123
13
votes
3
answers
4k
views
Setting default value in QGIS field
I would like to add in a layer's field a default value. I mean, every time a new feature is created, that field would be automatically filled with the default value.
In my case the default value would ...
- 3,768
12
votes
2
answers
21k
views
Updating text column of selected features in QGIS
Let's say I have a bunch of postcodes. After making a selection and having the records highlighted in the attribute table, how to update all of them and give them the same category?
In ArcGIS, after ...
- 2,350
9
votes
2
answers
4k
views
Displaying multiple attributes in QGIS Composer legend
I have a polygon layer which has a number attribute and a text attribute.
When I make a legend in the composer, it automatically chooses the number to display while I would like to have both the ...
- 470
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
8
votes
2
answers
2k
views
Finding the minimum value of different columns in QGIS
I'll try to calculate the minimum value of four different columns in my QGIS table like:
The min. value would be 1,50286 in the first row.
Is there any expression or tool to find the minimum value ...
- 183
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
7
votes
4
answers
4k
views
Calculate polygon field based on neigboring polygon attribute
I have a vector shape with many different sized polygons each possessing an own class name (for instance "houses", "houses with offices", etc ...)
I want to assign a new field to ...
- 8,180
6
votes
3
answers
1k
views
Wrapping heading of column of attribute table within QGIS Print Composer
The "wrap text on" function seems not to work for the heading of the columns, only for the rows.
I'm using QGIS 2.14.4
- 309