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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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Converting CSV to MultiPolygon shapefile in QGIS

I have a MultiPolygon shapefile and the attribute table looks like this. The district names and state names are jumbled with special characters. I know I can use the replace function in the Field ...
Gopalakrishnan B's user avatar
3 votes
1 answer
128 views

Filtering subset of records to be used in subsequent SQL statements

I recently posted this question, where the answer involved SQL and a Virtual Layer. In that situation, the SQL acted on the entire input layer, with the output exactly as desired. Now I would filter ...
Stu Smith's user avatar
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1 answer
47 views

Lines shapefile with black borders but transparency

In QGIS it is easy to remove fill inside a polygon to only keep black border. For the lines entities removing fill (or apply transparency) will only reveal the black bolder line behind of it that ...
Iris15's user avatar
  • 67
2 votes
1 answer
95 views

Creating tangential lines at points along shoreline in QGIS

I want to create tangential lines for each point along a shoreline in QGIS, such as the dashed line I've hand-drawn. These points are not randomly spaced, they each represent the angle at which each ...
Aubree's user avatar
  • 21
0 votes
1 answer
25 views

QGIS LAS files layer styling

I have no experience with LAS files and I am learning on the go. I have a LAS file from a city landscape, and I need to display the points only at exact altitudes for buildings (10, 18, 24 and 30 ...
whattodo's user avatar
2 votes
1 answer
95 views

QGIS regular expression doesn't work for '

I have the atttribute table with the values like these: 'WOLF CLOSE' 'ROBERTSON WAY' 'JEFFREY DRIVE' and so forth... I would like to get rid of the ', although the regular formula for the replace ...
Geographos's user avatar
  • 4,039
1 vote
0 answers
89 views

How to get Orthometric (or geoid) Elevation in QField?

enter image description hereHow to get Orthometric (or geoid) Elevation in QField? Is it possible to import Geoid model in QGIS? Or calculate by some function? Because in QField I can only get ...
Jokubas's user avatar
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0 votes
1 answer
33 views

Individually coloured markers in QField

Is there a way to individually change the colour of markers in QField (from QGIS) so that multiple users can 'mark them off'?
Caleb Scott's user avatar
0 votes
1 answer
30 views

Display point labels alternatively to left and right

I am working in QGIS and I have a point layer whose labels are to be displayed left or right of the point. The formula I tried to make it work is, in label placement, selected Offset from Point mode, ...
Trikelians's user avatar
3 votes
1 answer
98 views

GDAL nearblack command missing certain areas

I have the following GeoTIFF which contains white around the sides. The raster band info is as follows for the white area Band 1 254 Band 2 254 Band 3 254 Band 4 255 To try and correct ...
user832190's user avatar
-1 votes
0 answers
38 views

Seeking cookie cutting instructions [duplicate]

I'm used to MapInfo so are there basic QGIS instructions on how to use one shape to cut a shape out of another shape in a vector layer? I realise it's not referred to as cookie-cutting in QGIS. I don'...
Mbh's user avatar
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1 answer
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Automate the extent used in Layout Templates in QGIS

I've created a workspace template for QGIS for the projects we work on at my company. I want to create layers that work with the workspace template for our projects. However, the one thing I'm ...
sarchaeologist's user avatar
0 votes
1 answer
37 views

How does Float32 in GeoPackage raster work

The more general question I'm asking myself is: What (raster) datatype should I use for a GIS-based game I am making in non-gis software: GeoTiff+GeoParquet or GeoPackage? The software (Godot) has ...
Fee's user avatar
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1 vote
0 answers
45 views

QGIS Graphical Modeler: Dropdown list of strings based on fields values from another Layer

I have a graphical modeler where I need to type the name for a desired region as a string and extract some data matching the name of the region from an layer of another geopackage. In the following ...
Denis Crîlov's user avatar
1 vote
0 answers
31 views

Can anyone run Grass from within QGIS version 3.36.2?

I get the same error message no matter what Grass module I try to run from Processing. Current mapset warning has always been there, I am talking of the next warnings which actually leads to failure: ...
Morten's user avatar
  • 183
0 votes
2 answers
52 views

QGIS: Make larger symbols appear behind smaller symbols from the same layer

Points from a point dataset (delimited text file) are shown with graduated colors and graduated size. The symbology setting is as in figure A. The points overlap each other according to their listing ...
stonebe's user avatar
  • 467
3 votes
1 answer
87 views

Draw line and calculate distance from each no adjoining side polygons to perpendicular nearest side polygon

From a polygon geometry layer representing building boundaries, I show a screenshot: I would like to calculate, for each building polygon, the distance from each side of the polygon that has no ...
Ingrid Ingravida's user avatar
0 votes
1 answer
57 views

QGIS : Open raster .gdb Esri format

I try to open an Esri raster.gdb in QGIS (Open 25m Raster DEM, Altalis, Calgary, canada). I use 3.36.1-Maidenhead QGIS (Version de GDAL/OGR 3.8.4) Some "layers" are created but I can't do ...
francis's user avatar
0 votes
2 answers
75 views

Visualizing LiDAR image

I am new to QGIS and I am using QGIS 3.22 on a Windows 10 OS. After importing the .laz file into QGIS (with the "Add point cloud" command) I can only seea square whose boundaries are made of ...
Antonio's user avatar
0 votes
1 answer
51 views

PDF connected to point feature published to Leaflet with QGIS2Web

I have a PDF connected to point feature in a desktop project in QGIS and activating the Action on the point opens the PDF perfectly. I tried publishing this with QGIS2Web. The PDF is moved to the ...
Mikeoramma's user avatar
1 vote
1 answer
23 views

Filter/selecting features in layer in qgis by grouping after one column and only taking the max value of each group

Lets say there is a layer like this in qgis which can be copy pasted from this geojson: { "type": "FeatureCollection", "name": "test", "crs": { "...
Lenn's user avatar
  • 1,297
0 votes
0 answers
40 views

Shortest path for multiple points from line layer (optimized path)

I am using QGIS. I have a set of starting points (blue & red points), and I also have a vector line layer (green line). I need to find the shortest path from starting point (blue & red points) ...
Akhilesh jj's user avatar
0 votes
1 answer
62 views

Creating a vineyard map with QGIS

I'm trying to plot dots (the vines) in an irregularly shaped polygon. they are in parallel rows spaced 1.4 m apart and the vines are spaced 1.2 m apart. The rows are at a 45º angle from N. I tried to ...
Sophie Bernstein's user avatar
0 votes
0 answers
39 views

Finding shortest road distance between points on two datasets QGIS [duplicate]

I have two point datasets: Communities and Vet clinics I am trying to find the nearest distance between each community and the closest vet clinic, but would ideally like to link this to a roads ...
user111060's user avatar
0 votes
0 answers
31 views

QGIS losing legend settings

I am consistently losing legend settings including font, spacing and size when I come back to a qgis project. I am running QGIS 3.28, when I create a map and save and close it. If I come back to the ...
user243107's user avatar
0 votes
0 answers
64 views

How to edit the nodata value of GeoTIFF using QGIS/GDAL

I've been given a GeoTIFF, and when I open it, it has white areas where there's no data. In QGIS I've tried looking at the nodata value but it says 'not defined', so after some playing about I found ...
user832190's user avatar
0 votes
2 answers
70 views

Getting clickable path using QGIS

I import into QGIS a PostgreSQL layer obtained from a simple select. This layer contains paths pointing to folders on my disk. I would like to be able to click on it from the QGIS attribute window and ...
fcka's user avatar
  • 921
1 vote
0 answers
47 views

Importing Lon/Lat points from CSV file into QGIS

I am working on locating sites in Guinea for a National Parks Infrastructure Project. I have a chart with Long/Lat and I thought I might import them by adding a Delimited Text Layer using a CSV file ...
Cresolus Climate Responsive De's user avatar
5 votes
1 answer
221 views

Making buffer around crossing point on lines intersection in QGIS

I have two line layers A and B. I need to create a point at the intersection of these layers (which is not a science using "Line intersection"). Is there a possibility to draw a new one on ...
sttipa's user avatar
  • 197
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0 answers
29 views

Why does QField crash when opening/editing a project from QFieldCloud?

I created a QField Project by converting the currently open QGIS Project to a QFieldCloud Project using the QFieldSync plug-in. I then downloaded the QFieldCloud Project into QField on my mobile ...
Georgia Slim's user avatar
0 votes
0 answers
35 views

Different size between raster and shape

I have a problem trying to manage spatial data. I download the Birds of the World distribution shapefiles provided by BirdLife International and I have the cropland dominance from NASA data (available ...
Ricardo Soto's user avatar
-1 votes
1 answer
33 views

QGIS "Create Vector Grid" code

I need to create code in a plugin to create parallel lines at a given heading and spacing within a polygon. This is very similar to what the "create vector grid" function does. It's found ...
marcp's user avatar
  • 915
0 votes
1 answer
56 views

Printing PDF with N pages in QGIS Server

At present, I can only print one page using a template. However, I aim to enhance my capabilities by dynamically printing multiple pages using the same template. I tried but didn't work : http://...
Louis's user avatar
  • 15
0 votes
2 answers
60 views

Creating rings with buffer as polygon in QGIS [duplicate]

I need to draw circles with a buffer in one view. It will be an area around cities. I think it can be solved with a buffer or a cutout from the circle. How can I do this?
Marek Drličiak's user avatar
2 votes
0 answers
51 views

Calculating the end km with reference to the start km of road in QGIS

Note the labelling on the picture to be the lengths of the link segments and have been selected from Right to Left. Start KM = KM at the beginning of the link End KM = KM at the end of the link. (...
Kendel Mashuga's user avatar
0 votes
1 answer
56 views

Calculating distances between two features (polygons)

I'm a bit stuck on calculating distance between two polygon features (i.e. closest part of the polygon A to closest part of polygon B (not necessarily where the points are as sometimes a line between ...
sarchaeologist's user avatar
0 votes
0 answers
38 views

Calculating accurate viewsheds using DSM and DTM lidar data QGIS

I have a question regarding using DSM (Digital Surface Model) and DTM (Digital Terrain Model) data sets to create Zones of Theoretical Visibility. I used the QGIS Visibility Analysis plugin to create ...
ckatz19's user avatar
0 votes
0 answers
41 views

Showing attribute-form with objects of another shapefile in QGIS

QGIS 3.34.6: I have two layers, layer 1 shows different bridges, and layer 2 contains different events at these bridges in different years. Each event is one object in layer 2. I would like to get an ...
Bertram's user avatar
  • 483
1 vote
0 answers
18 views

QGIS Assign finish adding points (right-click) to keybard shortcut

In QGIS, is it possible to assign finish adding points (right-click) to a keyboard shortcut? As I 'm using a pen tablet for stream digitizing, is quite hard to press a botton onto it to end the ...
jimpap's user avatar
  • 11
0 votes
0 answers
17 views

QGIS copy and paste issues: unique constraints (id=5249) existed

In QGIS select features from one layer and copy them. Select the other layer with edit mode click "paste" tool. Then save the second layer, the error popups: the update can not be saved ...
Baohua Chu's user avatar
2 votes
1 answer
138 views

What is the name given to the table layer in QGIS?

What name is given to this selected layer? It's not a vector layer where you can add geometries, it's something like a table or spreadsheet.
Aloísio Ângelo's user avatar
0 votes
1 answer
63 views

Import Google Map into QGIS?

How do I import custom Google Maps (such as these: of the saints in Rome or in Italy) into QGIS?
Geremia's user avatar
  • 211
0 votes
1 answer
66 views

Convert a PNG file to a line layer in QGIS

I have a map in PNG-format that looks like this: I have imported it into QGIS as a raster. I want to create a line layer as a network based on the blue and pink lines. Is there a way to create a line ...
Fabi's user avatar
  • 75
1 vote
1 answer
34 views

Geometry still set as point when creating lines in QGIS Geometry Generator

I'm using QGIS to analyze coastal erosion and have come across an issue with geometry type. I have a vector layer of about 150 control points along the shoreline and used a geometry generator to ...
Aubree's user avatar
  • 11
0 votes
0 answers
21 views

V.Net.Salesman Unreachable Nodes at Intersections

I'm designing a network that has a layer of locations and a layer of street segments. I need to design a route to connect these locations along the street segments using the shortest route possible. ...
Michael Dinh's user avatar
1 vote
0 answers
48 views

Fully filling vector layer with polygons without dissolving the current polygons in QGIS [closed]

I have a vector containing flow paths for a specific area, with values ranging from 2-4. I want to fill in the rest of the area (to the red line boundary) with another/more polygons with a value of 1 ...
ashlaff's user avatar
  • 25
0 votes
0 answers
36 views

Calculating coordinates grid intervals - minutes and seconds in QGIS

I would like to define the coordinates for the grid to 15' intervals. This means ideally 15°15', 15°30' Here are the coordinates for the grid/area of interest: 15°48'0"E 16°0'0"E 16°12'0&...
Amelia Nicodemus's user avatar
0 votes
0 answers
23 views

Get associated roadway from sidewalk geometries in QGIS using OpenStreetMap data

I work with pedestrian network data from OpenStreetMap for cities where sidewalks have already been mapped as separate lines for all corresponding streets at least for parts of the city area (examples:...
winnewoerp's user avatar
  • 1,504
5 votes
3 answers
263 views

Creating list of adjacent polygons in QGIS

The answer to Using join in Mapviewer describes an effective way to count the number of adjacent polygons. However, I need to create a list of the adjacent polys. I envision a process that generates ...
Stu Smith's user avatar
  • 8,130
1 vote
1 answer
59 views

Renaming File Geodatabase feature class in QGIS

At QGIS 3.34.6, I am unable to rename feature classes or attribute tables using the Browser Panel. Here's the procedure that I've tried: From the Browser Panel, open a File Geodatabase by clicking ...
Stu Smith's user avatar
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