All Questions
18 questions
1
vote
1
answer
92
views
QGIS: Need to create a feature for a vector layer with a list of all unique values derived from a raster layer's cells
I have a vector layer with inner boundaries delineating certain land-use types in each discrete area.
I also have a raster layer that contains information related to the vegetation found in each ...
- 31
1
vote
0
answers
16
views
Setting numeric values in new field based on length and branches in QGIS
I'd like to know how to set incremental numeric values in a new field of a layer, which has been obtained by "shortest path from point to layer", based on the length and the branches. I need ...
- 995
3
votes
1
answer
3k
views
Can't merge two layers because of field length in QGIS 3.16
I'm trying a model which did work with QGIS 3.12 but don't in QGIS 3.16. In this model, two vector layers are merged by the algorithm native:mergevectorlayers. In the new version if a field of ...
- 55
2
votes
2
answers
588
views
Syntax for specifying a parameter input from an attribute field in QGIS model designer
If I have a layer with an azimuth field, I can easily use that field to define the direction of the wedge buffer by clicking on the button next to the azimuth value and specifying the field type and ...
- 71
2
votes
1
answer
525
views
Setting attribute of point if it matches point from another layer in QGIS
I have two layers of points:
The first layer contains points which have an attribute called "svf" with values between 0 and 1
The second layer contains a subset (in terms of location) of ...
- 41
1
vote
2
answers
216
views
QGIS add new field for each value in exisiting field on a vector layer
I have a vector layer containing around 17000 polygons with a field named 'theme'. Each polygon of the layer has one of 30 unique values (e.g. buildings, roads etc.) assigned to this field. I now want ...
- 19
1
vote
0
answers
53
views
Vector grid displaying scrambled
I'm having a weird problem with grids in QGIS 3.12.2.
I have generated a grid to calculate some zonal statistics, and am using that to display a few different things. All good so far. Nice pretty ...
- 11
5
votes
4
answers
2k
views
Populate field in one layer with corresponding value from another layer
I have 2 existing vector layers: 1 point, 1 polygon. In almost all cases the points overlap a polygon. Both layers share a field (Zone id).
The point layer has multiple existing features (1,000+) ...
- 339
8
votes
1
answer
9k
views
Splitting vector layer based on attribute value in QGIS
I have read the questions and comments here:
Splitting shapefile into separate files for each feature using QGIS
However, in my case, I don't have unique values for each polygon instead I have ...
- 123
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
8
votes
1
answer
998
views
How to merge two shapefiles with partial difference in QGIS?
As illustrated below, a copy of the same shapefile was given to two persons who edited them partially by changing the attributes of different features.
I would like to know how to merge the two ...
- 407
1
vote
0
answers
67
views
Codecing vectorial field qgis
I have vectorial data that I have loaded in qgis setting as UTF-8. I was checking if the values of field in atribute table is standartized. So I am creating a script to do it. However, when I print ...
- 1,980
1
vote
1
answer
2k
views
How do I fill a Field Combo Box with vector layer fields in QGIS?
I am new to python and I am trying to write my first plugin for QGIS. Earlier I asked this question to find out how I could populate a combobox with point vector layers (and nothing else).
I've been ...
- 77
4
votes
2
answers
4k
views
PyQGIS: Change attribute value doesn't work, results in NULL
I am writing a QGIS plugin, which at one point attempts to change several attribute values on a layer. However, in the end no changes are made. If I punch similar code into the built-in Python Console,...
- 313
4
votes
1
answer
122
views
Creating shapefiles using textfiles in QGIS
I have a shapefile in QGIS which has polygons in it . There are several other attributes for each feature .
I want to add another attribute to each feature . The value for this attribute is available ...
- 125
1
vote
1
answer
1k
views
Automatically changing the angle of a symbol in QGIS? [duplicate]
I am working with an iron age cemetery in QGIS. I marked every grave in a point layer with several columns; amongst others, burial rite (inhumation, cremation etc.). I inserted a second column for the ...
- 1,616
2
votes
1
answer
370
views
QGIS equivalent to MapInfo Sum Attributes for selected vector objects?
I´m looking for QGIS equivalent to the basic MapInfo tool "Sum Attributes". I´ll explain what it does:
For selected objects in a vector layer, a popup window shows basic statistics such as:
- Sum ...
- 73
4
votes
1
answer
275
views
Comparing floor and roof areas using QGIS?
I am trying to show the available roof area for installing photovoltaic moduls in comparison to the respective floor area in QGIS.
I have two vector layers so far. One contains the floor area of the ...
- 43