All Questions
28
questions
0
votes
0
answers
33
views
Displaying specific field values of attribute table in QGIS Print Layout
I am building a layout where I want to add the attribute table of the map and only display the maximum and minimum values of a field. I think there is the option to filter by expression but I am not ...
- 41
0
votes
1
answer
34
views
How to generate values and create a heatmap from 3 different point vector layers in QGIS
I am new to QGIS and would like to turn what I have into a heatmap.
I have 3 different sets of points that go across the map of a UK (see the image attached) that represent coastal marine habitats. ...
- 1
2
votes
2
answers
93
views
QGIS Value Relation Widget saves not the KEY COLUMN values but the VALUE COLUMN values in the attribute table
As far as I know, the "Value Relation Widget" is supposed to store the records from the field designated as KEY COLUMN in the attribute table, while the records from the field designated as ...
3
votes
1
answer
252
views
Importing CSV results in NULL values for decimal column in QGIS
I am importing a .csv file and one of the "integer" columns ("ZVH Density") is all NULL values when imported as a Delimited Text file. Whole numbers import (known through trial and ...
- 31
5
votes
1
answer
193
views
Connecting points to the two closest highest values grouped by category
In a points layer with the fields "POP" (corresponding to the population value) and "CATEG" (corresponding to municipality id), my goal is to connect the points of each ...
- 2,419
3
votes
1
answer
95
views
QGIS attibute form with value relation avoiding table
Is it possible to use some expression or text containing a values list for the dropdown control to display them?
The goal is to use a short list of values and not have to create a related table for ...
- 2,419
3
votes
1
answer
251
views
How to recover parent value while creating parent and child layers in a embedded forms setup?
I read the documentation, examples and made many attempts, but I still can't make this work.
What I want is to get a value from a parent layer while editing a child layer, when both features are being ...
- 567
1
vote
1
answer
86
views
QGIS 3.22.16 Bialowieza. Selecting matching value in 2 fields
I am using QGIS 3.22.16, I try to select similar 'null' value in 2 different field. I tried the solutions suggested from one this exchange.
Selecting features with equal values in different fields in ...
- 321
4
votes
1
answer
383
views
QGIS 3.22: problems with dropdownlists (attribute forms)
I discovered the nice possibility in QGIS to create dropdown lists in a field, with which I (should) choose in a simple way one of several species (in my case) - while entering new features. I tried ...
- 483
1
vote
1
answer
531
views
Display expression of layer if geometries intersect in QGIS [closed]
I'd like to display the value of a layer (polygon with parcels) only in case a line (f.e. a river) intersects, crosses or touches the polygon of the parcel by using the expression dialog... but I ...
- 537
1
vote
1
answer
124
views
How to highlight by gradient specific range of values from the same field in QGIS?
There is a field about alcohol consumption by country with 10 max. and 10 min. values (picture 1).
Need to choose only 10 max. values and create a gradient map. Seems its needs to be some expression, ...
- 385
0
votes
1
answer
119
views
pH = 0 in pH layer
I have downloaded the pH layer from ISRIC database. However, when I added it to QGIS, I found it contained lots of points with the values = 0 (red points in picture).
Can I treat those 0 values as NA?
- 3
7
votes
2
answers
407
views
Classifying raster layer by number of equal values in given area using QGIS
I am using QGIS 3.16.12 - Hannover. I have a binary raster layer which consists of 2 values, either 0 or 1 (in my screenshots, 0 = black, 1 = white). The 1 values are scattered throughout the layer in ...
- 113
0
votes
0
answers
57
views
Adjusting pixel values to new pixel sum
I'm working with land use rasters in QGIS. For my application I have created rasters with pixels that have a fraction of 0-1 (for 0-100%) for a land use class. So for example in my settlement raster ...
- 1
2
votes
3
answers
1k
views
Digitizing and adding attribute values to the points in QGIS
I want to build a digital terrain model from nautical charts. I need to capture the points where depth is indicated in the chart, and for each point, I must attribute the depth value. One by one, to ...
