Questions tagged [qgis]

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

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I want to download Route map of Trans-Asian Highway Network

Need help in EIA Report Trans Asian Highway Network. I want to download route map of Trans-asian Highway Network. How can I proof the EIA Report is Correct? Suggest me some ways and Explain how to do ...
Srijan Sinha's user avatar
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Units of length

I've created a shapefile with polylines drawn. How do I measure the length of the lines. I've tried changing the units of distance (in Settings->Options->Mapping Tools->Preferred distance ...
Marc Bordelon's user avatar
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1 answer
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Create new layer in QGIS using SQL query

This is a related question to: Speed up performance of virtual layer based on GeoPackages in QGIS In that question, I was trying to use a virtual layer in QGIS (3.30) to add a region field to a suburb ...
Tom Brennan's user avatar
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Enabling render type for Mapzen Global Terrain in QGIS

I'm trying to change the color ramp on a Mapzen Global Terrain layer and only 'Singleband color data' is available in render type. 'Singleband pseudocolor' is not available. This is occurring in QGIS ...
Andy's user avatar
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Reverse linestrings, given attributes

I am working with street numbering and toponymy and I have an issue in hands: given some data provided by an Institution, i.e., points as door numbering and lines as the streets, those streets were ...
PatsonJS's user avatar
1 vote
1 answer
93 views

Delete default shadow's points in QGIS

I didn't find in QGIS documentation how to solve this and not on this site either. I am applying a color graduation for my point layer with a simple symbology. How to delete this shadow? It has ...
ANDRÉS's user avatar
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1 answer
24 views

Join non-spatial CSV layer with spatial shape layer, using multiple input fields

I have two separate layers i want to join in my QGIS-project based on multiple matching input fields. One layer consists of a non-spatial CSV table, but with the matching fields: Streetname, House ...
JTHW's user avatar
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Offsetting categorised symbology for features overlapping (only when features are overlapping)

I'm trying to look for a solution to a problem I am having with a polygon layer in QGIS. I've produced a 'Boundary' layer in QGIS, such boundaries are leveled the lower levels are inside the higher ...
joeliketoe's user avatar
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25 views

QGIS, Exporting .svg from a map, I can not produce it with as much resolution as in the main window

I am doing a PhD in wildfire modelling so that I need to deal with GIS data, mostly for visualizing purposes and data preprocessing. I am connecting to a XYZ tiles to produce a satellite map. In ...
Juan Luis Gómez González's user avatar
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0 answers
32 views

QGIS generate grid that aligns with landsat pixels

I would like to generate a grid that aligns with Landsat pixel boundaries. I am happy to do this with Python, QGIS, or commandline tools. Is it possible to generate one grid that aligns with all ...
staf's user avatar
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1 vote
1 answer
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Close a file created using GDAL

I have problems to close a file created in GDAL I have the following code (it's a part of bigger piece of code): driver = gdal.GetDriverByName("GTiff") SAL01=driver. Create(Fnout1,afile....
Eduardo's user avatar
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Classification in QGIS with modifications in Lizmap

I'm trying to make some changes to some fields of a point layer in Lizmap. Currently the changes I make are updated in the DB. I'm looking for a way to dynamically manage the classification done in ...
Guido Fonzo's user avatar
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1 answer
16 views

Creating a Weighted Map using weighted overlay method for finding shortest cost path

I have three input files as below: Digital Elevation Model in tiff format Drainage file in vector format (.shp) containing drainage data Roadmap file in vector format (.shp) containing road data I ...
Navneet Srivastava's user avatar
1 vote
2 answers
38 views

Connecting points to the nearest K polygons in QGIS

I have a layer of point data, and a layer that contains polygons of all the lakes in a region. I am trying to find the K closest of these lakes for each point. The distance should be measured from the ...
p1unge's user avatar
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What points should I add or sampling should I change to get a better georeference within QGIS?

I am working with an image that I need to georeference onto a base map. I have already added two other images to the map with minimal issues. They are not 100%, but they are good enough for this. ...
Paul Carlson's user avatar
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0 answers
50 views

QGIS - Select Features by Value issues

I have a point shapefile (parent) which is related to a CSV table (child) through a one-to-many relation (Project > Properties > Relations > relationship strength: association). When I click ...
HyPhens's user avatar
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1 answer
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Represent linestrings with arrow direction based on origin and destination points location

I have two layers: one linestring layer with two attribute fields that identify the codes of the origin (field A) and of the destination (field B) nodes; one point layer with one attribute (unique ...
Michele Cordini's user avatar
2 votes
3 answers
67 views

Converting a shapefile into a Power BI ready JSON file

I have a .shp file that I want to use in my Power BI dashboard, however I keep running into multiple issues. Because Power BI only accepts TopoJSON for its shape maps, I have to do some ...
jespergeospatial's user avatar
1 vote
0 answers
39 views

Selecting more than one label with expression builder?

I have a layer with placenames and would like to show only a few lables like villages and not farmnames in areas where I have selcted all the Labels on the layer. So after I have selected some labels ...
Erland Flaten's user avatar
0 votes
1 answer
53 views

Cannot get line to use style file but works fine with polygons. Any idea why?

I'm using the UKHab symbology (style file downloaded from the UKHab working group). It works fine when assigned to the polygon shape file but when I try to assign the symbology to the line shapefile ...
Fiona's user avatar
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1 vote
0 answers
29 views

QGIS - Export layer with one polygon subdivided as multiple rows to CSV

I have a GeoJSON file with quite precise boundaries of world's countries. I had to simplify it because Snowflake, where I want to keep the data, has 16MB limit and Canadian polygon is always too large....
Moseleyi's user avatar
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1 vote
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Read only certain columns (read permissions) of a PostGIS database in QGIS

In our administration, each employee is given various rights to read and edit data on the PostgreSQL/PostGIS database. To view the geodata, we use QGIS. In this case there should be read permissions ...
cc_schr_gis's user avatar
1 vote
0 answers
32 views

Getting -inf values when calculating zonal statistics from raster layer in QGIS

I am trying to get some summary statistics from a raster layer (CRS EPSG:3035 - ETRS89-extended / LAEA Europe - Projected) of forest biomass for each polygon in a shapefile layer. I have used the ...
Ana Barros's user avatar
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0 answers
29 views

Aggregate values of a field by clusters

I want to group points by distance. I'm using the 'Group of points" in Layer Style. I also want to sum the value of a field to the aggregate of the cluster, and I need the new cluster point to ...
Pedro Toledo's user avatar
0 votes
0 answers
51 views

QGIS shortest path but coordinates of another layer as intersection point [closed]

I would like to process shortest path between points A and C (point layer), as seen on screenshot, but instead of using the intersection of lines, I would like to force to get to point B. Is it ...
xhyf038's user avatar
4 votes
0 answers
104 views

How to change the Point Cluster circle symbol to a convex hull

I am using the expression presented by the user JGH to solve the question 'Point Clustering in QGIS, but values show a percentage and not count of points' This shows my example: As you can see I use ...
Ingrid Ingravida's user avatar
2 votes
1 answer
96 views

How to replicate QGIS's Identify Features functionality with ogr2ogr when downloading data from WFS endpoint?

I am working with this WFS endpoint: https://wxs-gpu.mongeoportail.ign.fr/externe/39wtxmgtn23okfbbs1al2lz3/wfs In QGIS, I do: Layer -> Add Layer -> Add WFS Layer..., then add the above endpoint. ...
zabop's user avatar
  • 1,308
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24 views

Load CSV from SFTP

I have a CSV on our sFTP. This CSV is automatically updated every night. I would like to add this CSV file to my QGIS project, so i can see the updated data. But.. I've never made a connection to a ...
Mathijs Alkema's user avatar
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0 answers
22 views

Dynamic point tracking with QGIS and Lizmap

I'm working on a vehicle tracking project and would like to use QGIS and Lizmap. The data is on a PostGIS database and comes from a web service. What interests me is how to visualize the dynamics of a ...
Guido Fonzo's user avatar
3 votes
0 answers
55 views

Where can I find common symbology presets for QGIS?

I am looking for a collection of basic, common styles that I can just apply in QGIS. In ArcGIS, I am used to having a comprehensive set of common symbology options built-in, e.g. different road types, ...
Honeybear's user avatar
  • 2,062
1 vote
0 answers
30 views

How to get multiple inputs for Extract selected features processing tool in model builder

First time using QGIS modeler so i'm not familiar with it. I want to select features from multiple layers (how many layers and what layers changes depending on the work) merge them into 1 layer (...
Mow's user avatar
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0 answers
33 views

Duplicate geometry by inheriting features in QGIS

I'm working with QGIS desktop and then exporting the project to Lizmap. What I need to do is modify the attributes of an already existing point geometry: For example I have a point geometry with ...
Guido Fonzo's user avatar
-1 votes
0 answers
29 views

Identify feature not displaying info QGIS

I’m having issues with the identify feature selection on QGIS.When I click on a feature it says ‘feature could not be found’. It used to work fine. I checked that I’m in the right CRS, restarted the ...
Marcy's user avatar
  • 1
0 votes
0 answers
29 views

Error when cropping a layer mask (raster)

I'm trying to crop an image using the mask layer to make a slope map and relief analysis, but every time I try, these errors appear, as shown in the images below.
Laura dos Santos Lourenço's user avatar
0 votes
1 answer
61 views

Creating an automatic page size inQGIS Print-Layout with a pre-defined scale

How can QGIS Print-Layout with a given scale (eg 1:50000) create an automatic page size and layout equal to the coverage of the selected map layers? I tried it in the page properties, it didn't help: ...
Rudzik's user avatar
  • 99
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0 answers
21 views

QGIS - Processing framework - QgsProcessingParameterFeatureSource type

I use QGIS to build a script with processing framework. In processing toolbox menu I wan't to "filter" data with data types. I can filter point/line/polygon vector layer but how can I filter ...
GeoGyro's user avatar
  • 1,566
0 votes
1 answer
52 views

How to change vertex order to a polyline in QGIS?

I'm trying to change the vertex order of a polyline in QGIS. I have an existing polyline that's closed (last vertex = first vertex). The starting point of this polyline is in a totally casual position....
niubii's user avatar
  • 1
1 vote
1 answer
50 views

Import tiles OpenStreetMap QGIS [closed]

I have a map in QGIS that is supposed to have multiple layers, a custom made map, and a google street/openstreetmap layer. The layers somehow don't work, and so I decided to make a new connection. I ...
cobdmg's user avatar
  • 11
0 votes
1 answer
35 views

Identify feature issue [closed]

When I click to identify a feature it comes up with 'no features found at this position'. It was working fine before so I think it's something to do with the settings. I installed the latest version ...
Marcelina's user avatar
0 votes
0 answers
20 views

Result of merge in QGIS is image that doesn't contains all the merged raster

I'm trying to merge ~10 rasters that I have on qgis. Each raster has 2 bands.The rasters overlap each other, and their no-data value is -9999. This is how all the rasters look like before merging (the ...
ReutKeller's user avatar
  • 1,967
0 votes
1 answer
59 views

Joint feature QGIS 1 a N

I have 3 tables, a linear table of sections, a non geometric table of bus lines, and a intermediate table between both, with relations N:M. In the intermediate table I have the ID of sections table ...
pablo.olivares's user avatar
1 vote
1 answer
44 views

How to change the layout DPI for PDF export in QGIS

I am working with QGIS 3.28.4. I have set the export resolution to 300dpi in the layout properties but when I export the layout as a PDF it gets exported at 72dpi. If I export it as png it gets ...
user2054004's user avatar
1 vote
1 answer
56 views

Drawing lat, lon grid over UTM project not working in QGIS 3.32

Goal I want to draw both an UTM coordinate grid as well as a geographic coordinates grid (lat, lon) on a map in the QGIS print layout window as shown here. Setup GeoTIFF layers with tfw files as .zip ...
Pedr Bergfalk's user avatar
0 votes
0 answers
21 views

Plotted data in Python and plotted data in QGIS is different

I'm currently working with a raster dataset containing U.S. land cover data and a vector dataset containing building footprints within a specific state. When I attempt to plot two buildings that ...
Aspiring_Learner's user avatar
0 votes
0 answers
7 views

QGIS 3.26 Layer from Image server disappears after panning/zooming

I've connected to an ARCGIS Image server using the ArcGIS ImageServer Connector plugin on QGIS 3.26 As soon as I pan/zoom the image disappears in the viewer and never returns. I've tried using QGIS 3....
Sylvino's user avatar
  • 53
0 votes
0 answers
29 views

Cluster points based on a maximum distance to each cluster's center

I have a layer of buildings (points). I would like cluster as many of them as I can around a common point in space in such a way that all the members of each cluster have a maximum distance of 100 m ...
Luís Macedo's user avatar
0 votes
0 answers
12 views

Batch process automatic filling of two columns

I would like to automatically fill two columns in my batch process. Column 3 is to be numbered consecutively with "fid_". Column 5 is to be numbered consecutively with "fid_Mi_". ...
ToSa's user avatar
  • 1
0 votes
0 answers
54 views

How to use an Excel file (.xlsx) in QGIS

So I have an Excel file where I want to use built in Excel features such as restrict data type in columns etc. but I want to use QGIS to display the data. I know that I can change it to a CSV file ...
axel_ande's user avatar
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0 votes
0 answers
40 views

Calculation of LST overestimates values

I am trying to retrieve LST from Landsat 8 data, after writing my script, it shows very good results until I estimate the emissivity of my study area, but when I run the following part, var LST = ...
aimen's user avatar
  • 1
0 votes
1 answer
30 views

Extract climate data

I need Qgis to extract climate data informations which are layered into the maps. Moreoever, I got exact geospatial plot-information for all of the plots. So lets say I got in QGIS a map with 2500 ...
JamesduBond's user avatar

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