Questions tagged [qgis]

QGIS is a cross-platform GIS application licensed under the GNU General Public License.

Filter by
Sorted by
Tagged with
0 votes
0 answers
2 views

Set random points within a given distance of a known street network

I have a street network with a known ditance of 39735 km. Now my goal is to set a point every 200 km on this street network, so that there will be exactly 198 points generated. The distance of 200 km ...
0 votes
0 answers
10 views

Using resolved values as a label in child table using only the defined Value Relation

I have a "Value Relation" defined to a parent table from a child one in QGIS 3.34.3: The attribute table shows the resolved value (species name) correctly: Same when I use the "...
27 votes
5 answers
19k views

Error adding qgis.org repository public key to apt keyring

The old QGIS key ring qgis-2017.gpg.key is expired and generates a warning during apt update today. Following the QGIS instructions, I tried to update the key as follows: wget -O - https://qgis.org/...
1 vote
1 answer
778 views

Error calculating LST in QGIS

I was using QGIS to calculate the LST of a city from Landsat 7 and 8 datasets. I was following online formulas to do the computation but I kept getting weird results (i.e. -17~62°C or 44~71°C; which ...
1 vote
2 answers
90 views

Extract specific information from a shapefile

I work with water and waste water systems. I have a shapefile that involves all the manholes and pipe ID's. My task is to extract 72 pipes that have unique ID's. In a shapefile that involves 4000+ ...
0 votes
0 answers
38 views

PyQGIS calculate the actual map dimensions on a dynamic layout

I'm writing a plugin to more easily create atlas coverage rectangles, which are to scale and can dynamically rotate from portrait to landscape orientation. I've also written in some code which can ...
0 votes
0 answers
135 views

Semi-Automatic Classification Plugin Error 6 Bands Missing

Whilst getting other people to run an unsupervised (ISODATA) classification in QGIS using the SCP (semi-automatic classification) plugin, several people obtained an error message labeled 'error 6: ...
1 vote
1 answer
26 views

QGIS Forms Range Widget steps

I am trying to use the range widget in QGIS attribute forms to allow the user to enter values in steps on 0.25 so values of (0.25,0.5,0.75,1,1.25...) The settings above result in values of 0.49, 0.74,...
0 votes
0 answers
53 views

Click and drag georeferencing

I am looking for a way to take a group of layers in QGIS and be able to move/geolocate them. I need to offset hundreds of TIFF raster files that are currently in a QGIS group, and I don't have a ...
0 votes
1 answer
39 views

How to display two attributes of line vector layer with same color ramp?

I have a QGIS line vector layer that contains two attributes: attr1, attr2. I want to display it as shown below. The same line geometry two times with an offset in both directions, but the catch is ...
1 vote
0 answers
67 views

Finding rectangular polygons in a multipolygon

I'm trying to do some analysis that requires finding rectangular gardens of a certain size. At present, I only have access to a data set of property extents with buildings punched out with the ...
4 votes
1 answer
87 views

How to configure the Attributtes forms to show the historic table related to 'n' records in QGIS

I have a point geometry layer that correspond to objects to street lamps. For each point I have the key field "CODE_ID". On the other hand, I have a maintenance history table. This table ...
4 votes
1 answer
329 views

Which output data type to choose in QGIS SAGA Raster Calculator in Batch Mode?

I have 5 years of MODIS13Q1 NDVI .tiff images for time series analysis. I want to multiply all the images with the scale factor of 0.0001 before using them. In order to process all at once I try to ...
6 votes
1 answer
239 views

Sharing properties for SQL Server table in QGIS

I have a project where most of the layers come from a SQL Server. Most of the layers contain pointers to, and/or drop down list for, attributes so that there is consistency in data entry. This project ...
0 votes
0 answers
31 views

Opening .png.aux.xml file in QGIS

I received a .png.aux.xml file. I have tried to read it with the GDAL translator and by making a URL from the code. I haven't been able to open the file in QGIS. Any ideas?
2 votes
1 answer
258 views

Could not load WFS with bbox parameter using PyQGIS

I try to load a WFS including a bbox parameter via PyQGIS. The WFS is loaded without problems, but unfortunately the bbox parameter does not work. If the bbox parameter is added to the query I get all ...
2 votes
1 answer
52 views

Create a map tip with pictures stored in relative path

I have created a QGIS 3.34 project in this directory: "C:/MyProject". Alongside with the QGIS project file there is a folder containing some georeferenced pictures I want to show on my QGIS ...
0 votes
1 answer
512 views

How can I stack several 3D elevation layers?

So far I have been using qgis2threejs to display different layers at once like one terrain elevation layer and one population data layer. The result through is that the 3D population data is not ...
3 votes
1 answer
135 views

Set default in QGIS Drop Down

In the Value map widget can we select one value to be the default? I don't want to apply on update as users may choose a different value. I just want the default to be 'u' so in edit mode, I can click ...
0 votes
1 answer
23 views

How to style KML file boundary lines

I'm getting started with QGIS after watching some online videos on this. I'm trying to create a map with satellite imagery and a superimposed KML file of a real estate lot. If I display only the KML ...
0 votes
0 answers
42 views

Rule Based Line Symbology causing weird behaviour changes on zoom

I'm fairly sure this is an actual bug and have raised a ticket in Github, but it hasn't been looked at yet and just would to see if anyone else has any other ideas that I can try, or can see anything ...
0 votes
0 answers
39 views

Source encoding of Argentinean words that contain accents, "ñ", and end in "-ción"

I've trying to find the right source encoding that allows me to read correctly my attributes table with words that contain accents, "ñ, ü" and end in -"ción", but I still could not ...
1 vote
0 answers
74 views

Managing PostGIS many-to-many relationships between several tables with different geometry types from QGIS

I have this data set stored in a PostGIS (16+3.4) database: Each category of items being stored in its own table: CREATE TABLE public.rock ( id INT PRIMARY KEY GENERATED ALWAYS AS IDENTITY, ...
0 votes
0 answers
28 views

Develop a system for dynamically identifying and documenting pois within a variable distance from trail signposts [closed]

Goal: I would like to create a system within QGIS that enables the dynamic identification and listing of Points of Interest (POIs) within a variable distance from specific signpost locations along a ...
0 votes
0 answers
26 views

QGIS Version 3.34 -Error during XML import

When importing such an XML file into QGIS version 3.34, an object attribute (dientZurDarstellungVon) is not imported. There was no problem with this XML import in the previous version. The XML ...
0 votes
1 answer
48 views

Least cost path based on flow direction

I need to find least cost path between two points inside a river polygon. The least cost path criteria is water flow direction, I need to follow the water flow to waste as little energy as possible. I ...
2 votes
1 answer
56 views

Find location of highest point density in QGIS?

How do I find the location of highest density of points in QGIS?
0 votes
0 answers
18 views

Vector grid to raster error

I try to raster grid layer using layer attribute and I get rasterization error. Initially I have a layer with a grid and a line layer with several lines. The line layer has an attribute ("az"...
1 vote
0 answers
27 views

Modify 500m MODIS landuse data based on 30m Landsat 8 data

I am using WRF real case to study urban breeze. I used MODIS 15s 500m resolution data for landuse. There are 378x378 grids. This data underestimates the urban area in my study area. I made a ...
0 votes
1 answer
208 views

Temporal/Spectral Profile Tool: Python error - QGIS 3.16 macOS Catalina

"Temporal/Spectral Profile Tool"-plugin runs into a Python error (below: reports import error in last two lines, entire error message is 14 lines): QGIS 3.16.13 on mac 10.15.7, running Qt 5....
0 votes
0 answers
81 views

Pretty "buffer" around Point-Layer with as little as possible Vertices [closed]

I'm searching a solution (which I can automate) for getting my Area of Interest around Points of Interest. I've got a point-layer in QGIS. I want to have all the area which is inside a 0.5 m Buffer ...
1 vote
0 answers
46 views

Customize simple symbol shape for point (sharper triangle) in QGIS

I want to customize a simple symbol shape in QGIS because the basic triangle has a too large base for my purpose. I see that in simple symbol panel there is a data defined property next to the symbol ...
2 votes
1 answer
705 views

Some rasters appear only white/black in PDF exported from QGIS and viewed in CorelDraw X7

I'm having a recurring problem with exporting raster imagery in QGIS's print composer for use in CorelDraw X7 (for map styling). The problem has persisted for some time, through many releases of QGIS ...
1 vote
1 answer
28 views

Using QuickOSM in model designer QGIS

I am trying to create a model in QGIS using the model designer but having difficulties with the QuickOSM features. My goal is to: Create three buffers (2km, 3km, 6km) around a multi point feature. ...
0 votes
0 answers
29 views

Merge road layer.shp and underground bt layer.geojson

I would like to merge a road layer .shp and a BT souterrain.gejoson network layer to create a single layer. This will allow me to form a unified network to calculate the shortest path between two ...
2 votes
2 answers
724 views

IndexError: list index out of range on APP STARTUP v 3.16.1, 3.16.0.2, 3.14.0

During start up of the app, the following error occurs. An error has occurred while executing Python code: IndexError: list index out of range Traceback (most recent call last): File "n:/QGIS3~...
-2 votes
0 answers
32 views

How to utilize processing for QGIS [closed]

I have 2.6 GHz processor for VM and can't utilize it to process faster, is there an easy way to solve the problem except for increasing threads in processing options?
0 votes
1 answer
267 views

QGIS - Photo Widget

Is it possible to append info to the file name of a photo? We use QGIS in office Merginmaps in the field to collect data. When we setup the layers to collect utility pole data, we have added a photo ...
0 votes
1 answer
198 views

Orfeo Toolbox segmentation - increasing n segments

I'm checking out the parameters for Orfeo's Segmentation tool and I'd like to know how to increase the number of segments that are output in the vector output. https://www.orfeo-toolbox.org/CookBook/...
1 vote
1 answer
62 views

Finding shortest distance from one point to each polygon and the distance from that point of the polygon to any of the points in the polygon in QGIS

I'm trying to find the shortest distance from a point (point A uploaded as a CSV) to a polygon uploaded as a shapefile (polygon 1) and then the distance from that point of the polygon to any of the ...
0 votes
1 answer
31 views

No result from algorithm r.stats in QGIS

I don't understand why algorithm r.stats doesn't give me result in the sidepanel (show result); the error is 'impossible open the file' What can I do to solve the problem? I show you: Versione di QGIS:...
2 votes
0 answers
65 views

Topology-aware "waviness" for polygons in QGIS

I am wondering if there is any chance to create "wavy" polygons that respect the topology. In a polygon-layer where the individual features shares boundaries you can easily style each ...
-1 votes
0 answers
26 views

Is it possible to embed a 3d model from Sketchfab to a web map?

I have created a simple web map through QGIS to organize and georeference 3d models I have made. I currently have it set up to where a user can click on a point or polygon to show a popup with a ...
1 vote
1 answer
1k views

QGIS Server with IIS 7.5

I'm trying to set up QGIS Server (2.18.18) with ISS (7.5) on my local machine with Windows 7 Ultimate 64bit. I managed to get it running with Apache (XAMPP) without any problems, but I need QGIS ...
0 votes
1 answer
476 views

Does QGIS support AWS Redshift connection?

I am planning to connect AWS Redshift using QGIS for work purposes. However, I am not sure whether I can connect or not.
2 votes
0 answers
43 views

Setting image as font filling in QGIS

Is it possible to use an image as a label font filling to have a result like in the following examples with national flags?
1 vote
1 answer
63 views

Moving individual polygons in QGIS

In QGIS I am using the "BreederMap" plugin to define the layout of a large wheat field trial with 10m2 plots. Unfortunately, the lines are not exactly straight (sowing done without GPS and ...
1 vote
1 answer
431 views

Plugin Update from Python 2 to 3, ModuleNotFoundError: No module named 'resources'

I am currently working on an update for an old Plugin which I want to use in QGIS 3. I came across the problem, that when trying to import modules in the same directory of the plugin.py errors occure. ...
1 vote
1 answer
114 views

Error with array_foreach when using together with aggregate in QGIS expression [closed]

I want to use array_foreach functionality. But it does not seems to work when used in an aggregate function. This intermediate test ( array predefined, instead of array generated by another aggregate),...
3 votes
1 answer
256 views

Extracting elevation profile from CSV containing XYZ data

I am new to GIS software. I have XYZ data in a text file (delimited text). The data is XY in 1m spacing, approx. 12km x 900m of data. I want to find the elevation profile from a XY path. In QGIS, i ...

1
2 3 4 5
816