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Questions tagged [qgis-3]

for questions specific to the 3.x series of QGIS.

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Error al ejecutar la herramienta Poligonizar (ráster a vectorial) en QGIS 3.34.4 [closed]

necesitaría ayuda en lo siguiente. Estoy tratando de transformar un archivo ráster a vectorial y cuando ejecuto la herramienta poligonizar me salta el siguiente error. Alguien me podria ayudar? ...
Esteban Carrera's user avatar
1 vote
1 answer
32 views

Showing bin upper/lower bound for discrete legend for raster in QGIS

I want to have binned coloring/legend for my raster data. I can get to show only the upper bound of the bin. Is there a way to show the legend with upper/lower bound, like this? ['< 0', '0 - 0.05',...
yosukesabai's user avatar
0 votes
0 answers
25 views

QGIS 3.28.15: Model designer - Save output to specific choosable folder

I want to enable users to specify a folder where all the output of the model is to be saved when running it in QGIS. The model was created in the model designer. I have searched far and wide and tried ...
KarlD's user avatar
  • 1
0 votes
2 answers
45 views

How to add a OpenTopoMap legend

I'm a beginner when it comes to using GIS in general and QGIS in particular. I use xyz OpenTopoMap as my basemap and want to display an appropriate legend in my layout, but don't understand the ...
user249383's user avatar
3 votes
0 answers
99 views

Attach functions to QGIS processing algorithms

I am trying to find a way to attach a function to run whenever any processing algorithm either starts, succeeds or fails in the main QGIS application. The functions should be attached when a plugin is ...
Dror Bogin's user avatar
  • 3,555
0 votes
0 answers
28 views

How to add a north arrow using stock QGIS images in Python

I am trying to add a north arrow to a map (QgsPrintLayout) using PyQGIS. The closest thing I could find is from this GIS.SE question (Adding north arrow using PyQGIS): north = QgsLayoutItemPicture(...
tinlyx's user avatar
  • 11.1k
1 vote
0 answers
42 views

Adding data-driven command in PyQGIS

I want add to my code line which add option placed label based to data. I would use string in_mask(0) as string, because i want hide labels under the mask. layer = QgsProject().instance()....
szoon's user avatar
  • 111
0 votes
0 answers
33 views

NetCDF format not recognized for import into QGIS (Mac) v. 3.38

I am having trouble importing NetCDF files into QGIS on the Mac platform. I am running the latest version of QGIS installed through Macports to get maximum performance with an M1 processor vs the ...
keeneh's user avatar
  • 1
0 votes
1 answer
38 views

Spatial selection of intersected entities within a shape does not take the new entity

I'd like to retrieve part of shape A from layer A in relation to the boundary of my layer B. After making an intersection, I end up with a new layer, "intersect_layer". Using spatial ...
MesanGeo's user avatar
1 vote
0 answers
34 views

Place labels as close to centroid as possible without collision in QGIS

In QGIS, I want to print a map to a PDF and use labels for my polygons with the following criteria: Show all labels The labels do not collide The labels are placed as close to the centroid of the ...
00koeffers's user avatar
0 votes
0 answers
38 views

Issue with Google Earth Engine Plugin in QGIS

I am trying to resolve an error from using the Python console on QGIS. I have QGIS version QGIS version 3.34.4-Prizren on my linux Ubuntu 22.04.4 LTS, Codename-Jammy. Then I successfully installed ...
TG_'s user avatar
  • 1
1 vote
1 answer
39 views

Cannot select or delete annotations in QGIS

I added two annotations to a map project in QGIS, and I cannot select or delete them. I cannot locate the annotations layer in the Layers panel, nor in the Layer Styling panel. This must be an easy ...
Steve Wernke's user avatar
0 votes
0 answers
37 views

Error when using vector layer merge tool in PyQGIS: 'incorrect parameter value for LAYERS

I am attempting to use the QGIS tool to merge vector layers and then load the merged layer temporarily in QGIS after running the following Python code. However, I am encountering an error message. ...
Raíssa Daher's user avatar
0 votes
0 answers
25 views

QGIS: Using HTML "other widget" in feature attribute form - white space below text

I am currently creating a QGIS template with a standardised feature attribute form upon feature creation. It would be very useful to have text explainers on some of the tabs I've created, I can use ...
Rob Askew's user avatar
0 votes
1 answer
68 views

Wrong position after import the GML/CSV files in QGIS 3 ( which shifted to Africa)

I am newbie to QGIS and following the tutorial from this website to learn how to use QGIS: https://csdigeolab.gov.hk/en/resources/videos/gis-et-ep2 (Sorry but the video only provides a Chinese version)...
Light's user avatar
  • 17
0 votes
1 answer
50 views

Wrong answers using QGIS Raster Calculator

I am carrying out a simple subtraction of 2 raster layers, both with 1 band using both the raster calculator and GDAL raster calculator tools in QGIS version 3.28.5. Both rasters are using CRS 4326. ...
Sean Jarrett's user avatar
1 vote
1 answer
55 views

QGIS Raster Calculater Syntax - unable to combine 2 expressions

I have a slope (in degrees) of a DEM where I'm attempting to assign various values to various bands via Raster Calculator. The individual expressions work, but when combined they do not. ("slope-...
IanGS's user avatar
  • 388
2 votes
0 answers
51 views

How to show / hide multiple symbols at once in QGIS?

In the layer panel of QGIS 3.34, it is possible to select multiple layers using either mouse drag or shift + arrow up/down and then press the space bar to show/hide them all at once. However doing the ...
nicolas galipot's user avatar
4 votes
2 answers
68 views

Change Value of Cell in Cost Layer (Raster) by whether it touches neighbouring cell

QGIS 3.36-Maidenhead: I have compiled a very large cost raster covering parts of Africa. I have applied cost values to all cells based on geographical considerations. I'd like to carry out a final ...
IanGS's user avatar
  • 388
0 votes
1 answer
27 views

Empty Metadata table in Semi-Automatic Classification Plugin of QGIS

I am working on Landsat 8 images using QGIS 3.36.2 When I want to convert clipped images to reflectance in Semi-Automatic Classification Plugin, nothing is displayed under the metadata table even ...
chandanr777 's user avatar
0 votes
2 answers
99 views

Open GeoPackage in spreadsheet with drag-n-drop

I would like to use GeoPackage as the default format for a project at work. The only issue is non-gis user prefer shapefile because they can drag-n-drop the .dbf in a spreadsheet and immediately use ...
MesanGeo's user avatar
3 votes
1 answer
109 views

How to stretch an image into polygon symbology on QGIS?

I have a world map polygons (vectors) on QGIS 3.28, and i want to add flag on each country. I have already a svg flag for each country on a field, but flags are represented like a mosaic: I try to ...
Rien Avoir's user avatar
0 votes
0 answers
22 views

Why does PyQGIS start saying roo.children() is empty after a while?

I am working on a small extension to the QgsProject Class. import sys sys.path.append("C:/Program Files/QGIS 3.34.6/apps/qgis-ltr/python") from qgis.core import (QgsApplication, QgsProject, ...
Bendigo McAllan's user avatar
0 votes
0 answers
33 views

Qgis2web hyperlink on polygon

I would like to create an interactive webmap with the function that each point, line, and polygon, when clicked, will be redirected to a specific URL website. Is there any way I can do that in ...
Vlademir Sazon's user avatar
0 votes
1 answer
69 views

Point Cloud Processing Tools on MacOS

I am trying to access the native Point Cloud Processing tools, developed by Lutra Conslting and added to QGIS 3.32 (https://www.lutraconsulting.co.uk/blog/2023/05/30/pointcloud-qgis-processing/). I ...
SamH's user avatar
  • 1
1 vote
0 answers
54 views

Opening network folder in Windows file explorer using QGIS

Among the attributes of a layer, I have a "PERCORSO_CARTELLA_SP" field that points to a SharePoint network folder. In QGIS 3.28.15, I can open the folder with Win10's file explorer using the ...
VadoDeCorsa's user avatar
0 votes
1 answer
24 views

Saving a vector layer with a different projection in the same directory as the original layer

I have a vector layer and I want to save it in the original directory, but I can't because access to the source file is denied. projekcia_prj = QgsCoordinateReferenceSystem("EPSG:3857") ...
Stano's user avatar
  • 41
0 votes
0 answers
30 views

Set your own QGIS plugin folder

In QGIS 3.32 I would like to deactivate the path to the plugin folder in the user profile. The plugins should be managed centrally (company instruction), without the user being able to add new plugins ...
cc_schr_gis's user avatar
0 votes
1 answer
42 views

QGIS Script - Use the results of a child algorithm

I want to create a script that runs native:pointsalonglines as a child algorithm and then does some other things with the results. But the moment I use getFeatures() in the results of the child ...
Daniel Möller's user avatar
0 votes
1 answer
49 views

List all selected layers in PyQGIS

I would like to list all the selected layers in the QGIS Layers Panel with PyQGIS. I'm looking for a PyQGIS function returning a list of all selected layers or a method to check if a layer is selected....
LeoC's user avatar
  • 547
1 vote
0 answers
37 views

Can't Import NAD83 / NRCan LCC Canada (EPSG:42304) in QGIS

I need to define the NAD83 / NRCan LCC Canada (EPSG:42304) CRS in QGIS to use the NBAC wildfire data from https://cwfis.cfs.nrcan.gc.ca/datamart/metadata/nbac. Since QGIS does not recognize this CRS I ...
JForsythe's user avatar
  • 173
0 votes
0 answers
21 views

Blue cross in middle of QGIS map canvas - how to remove? [duplicate]

QGIS has started putting a blue cross in the middle of the map canvas. I've seen earlier posts where this was found to be caused by a plug-in, and disappeared after the plug-in was updated. However, I ...
David Johnson's user avatar
0 votes
0 answers
21 views

Problem with rasterize vector layer to raster

I am trying to rasterize a vector layer by the rasterized tool for an university project (QGIS version 3.36.1). My lecturer did it without entering a burn-in value (because it is optional) and just ...
Lou190's user avatar
  • 1
0 votes
1 answer
59 views

PyQGIS - zoom/fit layer extent to map item layout extent

I have a temporary vector file from a qgis processing.run() (basically a line shapefile temporary output): gis_osm_roads_free_1_lyr = results['Gis_osm_roads_free_1'] I have a map_item: map_item = ...
Marin Marian's user avatar
0 votes
0 answers
39 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 ...
Nelg's user avatar
  • 175
1 vote
1 answer
34 views

Expression to auto-fill field according to the order of polygon creation

I'm working on an urban cartography actualization project, looking for a way to auto-fill a field (let's call it "field_1") in the new polygons created in the buildings layer. I need to ...
Mig TabSher's user avatar
2 votes
1 answer
51 views

QGIS layout, print grid labels beside lines

I am using QGIS (v3.36.1) to make a map for planning purposes. For the layout, I am looking at a map made in some kind of CAD software. It has labels on the gridlines inside the border, which I can ...
MortenSickel's user avatar
  • 3,834
0 votes
0 answers
19 views

QGIS crash everytime post not saving new layer

I edited one layer but closed project without saving it. Now my project is opening but it crashes within 2 - 3 minutes' of opening. What all I can do to save my work?
Rahul Raj's user avatar
2 votes
1 answer
89 views

Calculating field using expression taken from DataFrame with PyQGIS

The sample data can be downloaded here: https://github.com/jude9apple/sampleData I am using PyQGIS in QGIS 3.36 (in PyCharm) to run a script which reads a table containing which processes apply to ...
Juliette Lapeyre's user avatar
1 vote
0 answers
51 views

WMS layer doesn't load using PyQGIS

I'm using the following code to load a WMS layer to QGIS : url = "https://data.geopf.fr/wms-r/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&STYLES=normal&FORMAT=image/geotiff&...
aogino's user avatar
  • 15
0 votes
0 answers
56 views

Semi-Automatic Classification plugin error - QGIS - failed dependencies

I had been using SCP for the last year and just recently it stopped working. If I run any process that generates new images, those images are empty (all no data). I tested the dependencies and got: -...
rodrikev's user avatar
  • 510
0 votes
0 answers
24 views

QGIS Issue: Empty Tables When Styling or Adding Features

When using QGIS, I encounter empty tables when attempting to style features or add polygons to layers. This happens consistently across different functions.
Iacobet Iulian's user avatar
0 votes
0 answers
42 views

How to clip satellite base map into polygons [duplicate]

I'm trying to create a model to detect trees within the boundary of a country in QGIS 3.34. So far, I'm using the Google Maps Satellite base map from QuickMapServices. I created a vector layer where I ...
Bartek's user avatar
  • 9
0 votes
0 answers
46 views

QGIS: How to speed up loading of relation in forms

In QGIS I have two layers: layer containing points (trees) that each have an specific ID table contains all survey data. Each survey also contains the specific ID of the tree I linked them via the ...
Alexander Halm's user avatar
-1 votes
1 answer
36 views

Moved QGIS 3.6 to new PC and now need to change Output folder and Scripts folder

I moved my old QGIS to a new PC. Installed from zero, and later just copied "C:\Users[User]\AppData\Roaming\QGIS\QGIS3\profiles". Everything works fine, when I open my old projects it's all ...
Filip Frankopan's user avatar
0 votes
0 answers
32 views

Imported CSV files from Fieldmove and QGIS only displayed as lists

Downloaded some .csv data for an assignment I need to do (from fieldmove specifically), and am trying to display a single point for which i downloaded said data as a csv. file. However, when i try to ...
That Rock Guy's user avatar
0 votes
0 answers
58 views

Version error on SAGA NextGen on QGIS and MacOS

I am trying to use SAGA NextGen on QGIS and when I try to run a program I get an error message saying that I need to update the SAGA binaries to 9.1. I am using QGIS 3.34 on MacOS. Is there any way ...
ddomizia's user avatar
  • 648
1 vote
1 answer
45 views

In QGIS, a joined layer is not automatically set to edit mode, when edit mode of parent layer is switched on

I joined some fields of a different layer in QGIS (version 3.34.5) via layer properties, set them to editable and added them to the attribute form of the parent layer. However, when I use the form ...
ENOTTY's user avatar
  • 121
1 vote
0 answers
55 views

Calling ST_IsValid on a QgsGeometry in PyQGIS, referencing PyQGIS object in SQL statement

I'd like to be able to verify the validity of a geometry of type QgsGeometry within PyQGIS. From what I can understand, the steps are Convert QgsGeometry to something that ST_IsValid will recognize. ...
nr_aus's user avatar
  • 3,576
0 votes
0 answers
25 views

I am calculating LST for Mumbai

I am calculating LST for Mumbai and I found that only Airport and Slum, Barrel land is having high LST than any other region. I need to analyze it more if its just showing all area cooler in city like ...
kalpanapardeshi's user avatar

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