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Questions tagged [qgis]

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

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Solving Geometry Error in LST Prediction Using QGIS and MOLUSCE Plugin

I’m currently working on a project to predict Land Surface Temperature (LST) for the year 2033 using QGIS and the MOLUSCE plugin. My dataset includes LST raster layers for 2013 and 2023, along with ...
RAKIBUL ISLAM's user avatar
1 vote
1 answer
37 views

Free QGIS Retina/HiDPI map tiles still produce illegible text

I'm using QGIS 3.34.1-Prizren on macOS 14. When I use the default XYZ OSM basemap in QGIS on my Retina screen, the roads and labels are all extremely small and pixelated: URL: https://tile....
Nick K9's user avatar
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1 answer
23 views

Modify polygons imported from a MyMaps KML files

I made a map on MyMaps, I managed to import it to QGIS but I can't select the polygons to modify them. How can I do this?
Claromale's user avatar
2 votes
1 answer
59 views

Assigning Z value along line on raster using QGIS

In QGIS I have a mnt, a line with a Z attribute of value 100. How can I replace the Z values ​​of the raster that intersect the line (see a buffer around the line) with that of the line, i.e. 100? I ...
fcka's user avatar
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Convert from local to absolute coordinate having four georeferenced points

I am attempting to determine the absolute positions of several points acquired via a total station survey. I had also obtained local coordinates for four points (the vertices of the red polyline) that ...
Marco Cangemi's user avatar
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1 answer
62 views

How to add OpenStreetMap layer as bottom layer via QGIS processing script

I want to add an OpenStreetMap layer as the bottom layer of my project via a script. This works from the console: project = QgsProject.instance() root = project.layerTreeRoot() all_layers = root....
Nick K9's user avatar
  • 185
0 votes
1 answer
39 views

How to batch import geotagged photos into QGIS?

I did some flights with a DJI drone over an area a few kilometers long, and I would like to batch import the hundreds of geotagged photos into QGIS. I have tried the ImportPhotos Plugin but the photos ...
MapDeath's user avatar
  • 343
1 vote
2 answers
60 views

Removing character from many field names in QGIS

I have a shapefile with ~100 fields. Each field corresponds to a date, the name of each field is something like this 2006-07-05 (year-month-day). I want to remove the - symbol and have only 20060705. ...
Na_Na_Na's user avatar
  • 131
-1 votes
0 answers
24 views

Project urban growth [closed]

I need to project the urban growth to the future of my city, but I couldn't find a methodology or a tool to use, I think on Dinamica EGO, GEE, or some plugin on a GIS like QGis or ArcMap i could, but ...
Esteban Vera's user avatar
0 votes
1 answer
40 views

Opening .aprx files in QGIS via SLYR

I'm following this https://mapscaping.com/opening-an-aprx-file-in-qgis/ tutorial on how to open a ArcGIS Pro .aprx-File in QGIS via the SLYR plugin. While it does sound straight-forward, the .aprx-...
Rob's user avatar
  • 302
2 votes
1 answer
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Missing points datasets global monitor energy

I want to use the GEM data from Global Monitor Energy and incorporate it into QGIS. I downloaded the Excel data which I converted to CSV. Then, I wanted to add the layer thus created with the "...
AlexandreBAZ's user avatar
1 vote
1 answer
433 views

130 TIF DEM file (total size 3 GB) become 7.4 GB TIF file after merging. Why?

I combined (Merge) 130 DEM maps via QGIS, taking up 3 GB in total. However, the total size of the combined file was 7.4 GB. I'm new to QGIS. It's only been a few weeks. I don't understand why the file ...
William24's user avatar
0 votes
0 answers
26 views

Using the Crayfish extension in the modeler

I'm trying to use the crayfish plug in in modeler to convert a file. The model returns an error message. It turns out that the grib fish extension seems to generate two files. I deduce that my model ...
fcka's user avatar
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1 vote
0 answers
25 views

Adjusting position of raster layer in QGIS

I have a number of raster layers in QGIS, open-source or provided by other people. One of them is slightly off in position, about 100m in a map that is 10km square. Is there a way to add an arbitrary ...
Roderick Stewart's user avatar
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0 answers
31 views

How do I save a layer overlaying another as a .tif file?

I have a layer, with points and another layer with the original orthomosaic. I would like to merge the two layers and generate a new orthomosaic from this union: My layers: How do I save a layer ...
user249132's user avatar
0 votes
1 answer
33 views

QGIS graduated Symbology display Null Values

Working with QGIS 3.28.15 Firenze. I was under the impression that QGIS was able to display "NULL" (empty) values when using graduated symbology. Is this not the case anymore? I would like ...
Stryder_95's user avatar
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0 answers
49 views

I need to simplify contour lines and find relevant spot elevations from a Raster in QGIS [closed]

I am trying to simply the contour line generated from a raster in the following manner: this image describes how the contour is simplified without cutting away from the terrain, only adding , like a ...
Enache Stefan's user avatar
0 votes
0 answers
41 views

Splitting lines at intersection of nodes and lines in PyQGIS [closed]

I haven't found a solution to this problem that works. I need to segment lines at nodes, and there is no working tool that helps me find that. I have both the node and line layer as a .shp file, and I'...
user103858's user avatar
-1 votes
0 answers
43 views

Best isochrone mapping tool [closed]

I have been exploring isochrone mapping tools to try to figure out what my options are but am inundated by the choices available. Travel time API, open route service QGIS plug in, R's r5r package (...
ahmad farhan's user avatar
0 votes
2 answers
50 views

Clustering based on distance [closed]

I have a layer 1060 points and I want to create cluster of point that are within 200 m of each other. I have tried DoCluster tool with no success. I don´t want to pre-define the number of clusters I ...
Joaquín Mazarino Rodriguez's user avatar
-1 votes
0 answers
49 views

QGIS crashes when trying to open layer properties

When I try to reach the layers properties dialog, QGIS just crashes with the below error report. It doesn't matter which layer. I have tried with a lot of different shapefiles. I've also tried ...
Nathan Strathdee's user avatar
1 vote
1 answer
46 views

QField: Vice-versa auto-fill of two fields using value relation

I am setting up geopackage in QGIS (LTR 3.28.15) to be used in the field with QField (3.2 - Congo) for mapping birds. My geopackage has the following layers: Brutvoegel: Point geometry for saving my ...
lzo_mrn97's user avatar
1 vote
1 answer
25 views

QGIS - Filter value relation by crossing 2 arrays

I'm working on a value-relation to filter a list based on the content of 2 fields. The value relation is based on the field "IDC". I want to compare the content of the field "IDC" ...
Giene's user avatar
  • 753
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0 answers
48 views

QGIS - raster layer located off the basemap / doesn't display

I'm importing this raster layer (PTHA_19_San_Francisco_Amplitude_00475.tif) into QGIS. If I first import the OSM basemap using Quick Map Services, then import the raster layer and click "Zoom to ...
Quantum Qooler's user avatar
0 votes
0 answers
42 views

No CRS available for an .adf file [closed]

I imported this .adf raster from the JRC European website. Unfortunately, when I import it in QGIS or RStudio, I see no CRS and cannot compare this layer to standard WGS84 CRS layers. I started a free ...
ML_GIS_69's user avatar
0 votes
0 answers
34 views

QGIS getting the height from a *.gml file

So national geoportal is providing me with vector buildings in a GML file. They import great to the QGIS. but the atribiutes table does not have usual height field. In a 3d view they are flat. But ...
Maciej Eckstein's user avatar
0 votes
0 answers
32 views

Updating symbology of layer using selected features of another layer and table linking the two

I would like to come up with a visualization scheme for a connectivity matrix. I have two sets of polygons, and a table that shows the connections between them. I want to create a symbology using the ...
calquigs's user avatar
1 vote
0 answers
33 views

Convert ~14500 features into ~500 bounding boxes covering at least the same area in QGIS

I downloaded a shapefile from OpenStreetMap that covers all ocean and coastline. This consists of around 14500 features. What I am trying to do is generate a number of bounding boxes (say 300-1000) ...
Michael's user avatar
  • 111
0 votes
2 answers
44 views

Cannot display images on QGIS as action [closed]

I've been following through the QGIS training manual, section 5.4. I've created three features on the map, and have associated images with these features as attributes. I have set up an action in the ...
Asriel Wilde's user avatar
0 votes
1 answer
40 views

Can I remove the local file of a synced project in QField?

I am using QField Android to sync my data on the QGIS desktop. I would like to delete some of the projects which I downloaded from QFieldCloud (since some layers failed to upload to the cloud and ...
Light's user avatar
  • 5
2 votes
2 answers
65 views

QGIS How to calculate closest point referenced to centroid?

I have a QGIS project in which I work with a polygon layer ('POLIGONS_TEST') and a point layer ('PUNTS_TEST'). I use the following Geometry Generator expression on the 'POLIGONS_TEST' layer to draw a ...
Ingrid Ingravida's user avatar
1 vote
1 answer
40 views

How to vary the stile along a line in QGIS

I currently have a project with many lines where in the symbology I have the offset controlled by an expression. However with this setup I can only produce a single offset value for each feature in my ...
Ebony Ayers's user avatar
0 votes
0 answers
29 views

Aligning raster with shapefile

I have a raster file which I need to align with a shapefile. I tried gdal warp to reproject it to EPSG 4326. When I tried doing it, I get an error message ERROR 1: The transformation is already "...
proy's user avatar
  • 93
1 vote
2 answers
60 views

Displaying two elements in the same coordinate in QGIS [duplicate]

In QGIS I have two elements in the same coordinate and I believe the software is recognizing them as only one point. Is there a way for me to visually display in the map the presence of more than one ...
artretr0's user avatar
0 votes
1 answer
43 views

Make position of layout items adaptive in QGIS Layout to avoid empty spaces due to dynamic layout items

In the QGIS Layout manager I have a Legend item and a Label item beneath it. The Legend item only shows items inside linked maps. Therefore the legend height is different by every map I make. To avoid ...
i3-Maikel's user avatar
1 vote
2 answers
49 views

Exporting only one page of QGIS Print Layout

I would like to export a specific page from my layout as I've made an update to one of them. I have 20 pages so exporting them all takes a while, it would be a lot quicker if I could just select which ...
Phoebe's user avatar
  • 341
0 votes
0 answers
34 views

PDF output from QGIS with clickable layers AND a legend

I want to create a PDF with clickable (on/off) layers from a multilayered QGIS map - WITH - a legend and title. I can create a PDF with clickable layers which work from the map project window using ...
KLG_2640's user avatar
1 vote
1 answer
218 views

Phantom points in QGIS do not dissapear

Does anybody know how to delete these red dots with tooltips? There are not connected to any layer. Even if i delete all layers from the project these points remane in an empty project. Closing the ...
stew's user avatar
  • 93
1 vote
0 answers
47 views

Extrude shapefile using QGIS

I am presently engaged in creating a 3D map using QGIS. However, I am encountering challenges with my data. Specifically, I am working with two data shapefile with Z-value: floor (red) and roof (green)...
user248261's user avatar
0 votes
0 answers
28 views

Point to polyline or point to polygon for 3D map view in QGIS

I am currently attempting to generate a 3D map using QGIS. However, I am encountering an issue with my data where only the floor and roof are displayed, and the data for the walls is not appearing. ...
user248261's user avatar
-1 votes
0 answers
42 views

Importing and manipulating seismic line navigation data

I am hoping this is a good place to ask a generic question concerning the loading and display of seismic data in QGIS. I have been in the oil industry for a very long time and am interested in adding ...
Carl Huxohl's user avatar
0 votes
0 answers
34 views

QGIS attribute table only shows one country column but not complete rows and columns [closed]

Loading the world template in my QGIS, the attribute tables only show one country column but not the complete attribute table with all rows and columns. Is there a button or something to reinstate the ...
Rainer97531's user avatar
0 votes
0 answers
32 views

Apply affine transformation to LiDAR .las file

I'am currently working on a project that use a Local Coordinate system, and I need to reproject the file to UTM WGS84, to be able to load it to qgis. I have the formula and values to reproject the ...
José Bustamante's user avatar
1 vote
2 answers
67 views

Taking QGIS project from one computer to another

I had QGIS set up on my computer with a project I use. It connects to our SQL Server where the field data capture happens. I just got a new laptop and I wonder how to get that same project on the new ...
QGISBigginer's user avatar
-1 votes
1 answer
51 views

Create a map of different bat locations across two towns using OpenStreetMap [closed]

I'm very early on in the project and haven't used QGIS before. To begin with I want to have my project focus on two towns that I can easily jump between without any lag, I'm just wondering if this is ...
louis roberts's user avatar
3 votes
1 answer
65 views

QGIS Labeling expression to format a values list in a series of 2 columns of 2 records

From a layer of overlapping points (identical coordinates) containing the field "RC", I'm using the following expression to make the label of unique values: array_to_string(array_distinct(...
Ingrid Ingravida's user avatar
0 votes
0 answers
35 views

Importing layer data to QGIS from UMAP and converting it into correct Coordinate Reference System

I have drawn some polylines in the UMAP and saved them as a layer. Later, I figured out that QGIS is more suitable for my project. Then, I am trying to export the data from UMAP to QGIS. The data can ...
Light's user avatar
  • 5
1 vote
0 answers
44 views

Grouping data points based on proximity and minimal count of attribute in QGIS

I am using QGIS to map animal counts on farms in the Midwest US and using a circle polygon to show where there are more than 30,000 animals between all the farms in that specific area. Each data point ...
Ryan Whalen's user avatar
1 vote
0 answers
25 views

NetWorkErrorException when running QuickOSM plugin in QGIS

I can't run the QuickOSM plugin in QGIS. I have tried reinstalling the plugin but it doesn't work This is the log from Python error: Traceback (most recent call last): File "C:\Users/LISBETH/...
Lisbeth Adventiana's user avatar
1 vote
1 answer
25 views

How to set projection for Pacific-centered raster

I have a project in QGIS that I need to add a raster file to (.nc). The projection is EPSG:4326, but its boundaries are 0 to 360. How can I center the raster over the Atlantic ocean (180). Or, change ...
tony_c_graphics's user avatar