Questions tagged [qgis]

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

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votes
3answers
8k views

Travel time calculator QGIS

I will try explain this as best I can. I have a point on a map and I want to create buffers surrounding the site; for example, 10Km, 20Km 50Km. This is easy. But I also need to show buffers for ...
2
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1answer
28 views

Filtering dates by validity in QGIS 3.14

I have a WFS data, which I'm trying to filter by DATE. I'm using query builder. I need to filter valid dates which are max three years older than current date. I can do it if I calculate three years ...
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0answers
22 views

Is it possible to do directional variograms and kriging in SAGA or QGIS?

I'm trying to create directional variograms and do kriging for anisotropic soil data in SAGA or QGIS. Aside from setting the direction to quadrant in SAGA, I can't seem to find a way to do this. Is ...
1
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0answers
19 views

Symbol missing in legend when adding to layout map

I am new to QGIS and I am trying to make a map of India displaying some values. I want to have a legend, and I customised the legend in layers panel, the Layers panel clearly displays my legend. But ...
1
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0answers
15 views

“Could NOT find Python” error when compiling QGIS source code

I tried to complile QGIS source code according to the method from QGIS's INSTALL.md on my windows computer and did't know why CMake couldn't find the proper Python version although I had added related ...
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0answers
38 views

Making Drop Down list from layer attribute using QGIS [duplicate]

I have shapefile (.SHP) with village names of all India with different attributes like STATE, DISTRICT, SUB-DISTRICT, VILLAGE, PIN NUMBER with geometry. I want to make a dropdown list to select STATE ...
-1
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1answer
64 views

Creating a dropdown list to select by different attributes in QGIS

I have .SHP with different attributes like STATE, DISTRICT, SUB-DISTRICT/VILLAGE/PIN NUMBER with geometry. I want to make a dropdown list using those attributes to select STATE then DISTRICT then SUB-...
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0answers
27 views

Using GPU for processing Inverse Distance Weighted within Project Modeler

We are currently doing IDW interpolation within QGIS’s Project Modeler only it is taking over 24 hours to do one run. And we have over 30 to do. Is there any way we can get it to process the data ...
0
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0answers
19 views

QGIS Offline Editing Plugin scrambles layer structure on synchronization

At work our QGIS database is stored in a shared location. I tried using the Offline Editing Plugin in QGIS to store a copy on my local hard drive. When I tried to synchronize the offline project with ...
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0answers
15 views

Finding the path between the point

I'm very new to the PostGIS and QGIS. I'm a student and i doing thesis work on map matching. i want to explain detailly about the procedure that i want todo. i have segment shape file of two network ...
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0answers
9 views

Visual Studio Code Upgrading to 1.56.0… Issues with Environment Windows

Prior to the last Visual Studio Code update, I was able to set the windows environment variables. Now with the new update I can't and I don't know what to do. My code is: { "folders": [ ...
0
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0answers
21 views

Calculating cellsize of EsriASCⅡ data

I'm having trouble to calculate the cellsize of Esri ASCII data. I would like to use meteorological data from JMA following data with QGIS3 software which is used in my workplace. http://database.rish....
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2answers
12 views

Can I filter a subset of the polygons without affecting the rest of the polygons in QGIS?

When using QGIS 3.10, I often filter out unneeded features to create my maps. Is there a way for me to filter a subset of the polygons without affecting the rest? For example: The shapefile I have ...
6
votes
1answer
409 views

Placing several atlas' features into a single page

All the documentations and tutorials I've been reading about QGIS' Atlas are focused on creating an atlas in which every page is a feature. Or in other words: where every feature is placed in its own ...
0
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1answer
36 views

Give non-overlapping parts of 2 rasters a value 0 (QGIS)

Is there a way in QGIS to give non-overlapping parts of 2 rasters a value of 0 in the new raster file? I would like the data gaps in the velocity file (so where Ice mask is displayed on the chart) ...
5
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1answer
2k views

Why don't my polygons from MSSQL2008 display in QGIS?

I have imported a polygon shape file in MSSQL2008 using Shape2SQL loader without any issue. When I import the loaded polygon file in QGIS, I can't see it ! When I import other point or line features (...
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0answers
19 views

QGIS 3.10 - NetCDF created with xarray “is not a valid or recognized data source”

I have a xarray DataSet ds created from a Pandas DataFrame whose info are the following: Dimensions: (lat: 144, lon: 140, year: 9) Coordinates: * year (year) object 1980 1985 ...
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0answers
12 views

How do I avoid altering the data range when writing a NumPy array into a TIF file with rasterio?

I'm using a machine learning model to automatically recognize (a specific type of) vegetation in RGB imagery. The output of this model is a binary NumPy 2d array, with '1' meaning vegetation and '0' ...
2
votes
1answer
37 views

QGIS: Importing geotagged photos 'Could not open' error

I am having a hard time importing geotagged photos using the 'Import geotagged photos' tool within QGIS 3.10. The photos I am importing do have GPS information within their properties, so I can't put ...
0
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1answer
33 views

QGIS/Python configuration

This question came from another topic: QGIS - creating VRT does nothing. MacOS High Sierra (10.13), QGIS 3.10 Coruña, GRASS 7.8, GDAL/OGR 2.4.1, Python 2.7 The installation of GRASS was tricky (qgis ...
6
votes
4answers
645 views

Drawing lines to nearest points in QGIS

I have two point layers, one with telecom towers and another with secondary schools. I have used the NNJoin Plugin to find the nearest tower from each school, and calculated the distance between. The ...
1
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2answers
21 views

Fade out effect for QGIS Temporal Controller?

I am currently trying to animate wildlife movement data through the new QGIS temporal controller. Basic animations are working well. However, I would like the tracks to fade out over time but could ...
0
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0answers
25 views

Shapefile layers loading as the wrong geometry type

I have a QGIS project shared with a few users and one user, in particular, is having an issue that when she opens the project the layers (shapefiles) are loaded incorrectly - they've lost their styles ...
1
vote
1answer
165 views

Coordinates with leading zeros ignored in QGIS [closed]

I am using Irish national Grid (EPSG: 29902) with X and Y coordinates. Some coordinates start with leading '0's. Example: X= 081800 Y=339700. When imported in to QGIS, the leading zero of the ...
0
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0answers
30 views

No change in graduated symbol size in map, the change occur only in layer panel

I want to make a map of India with the population in some cities, with symbol size ranging from smallest to largest according to the population value. I used graduated symbol. I have 13 categories of ...
1
vote
1answer
35 views

Is there any way to get QGIS Decorations passed through to prints or layouts or QGIS2Web?

I can't see any way to have the QGIS decorations that are available to the desktop passed on to any outputs! The don't show up in layouts. They don't export to html via QGIS2web. (except the scalebar!...
3
votes
1answer
41 views

Getting rid of elevation difference between flat plane and designed DEM output

Does anyone know how to hide/ eliminate the height/elevation between the flat plane and the top of the DEM model (denoted with the red markup)? I am thinking of either just not showing the flat white ...
3
votes
2answers
151 views

Converting PyQt5.QtCore.QVariant to string

I am using QGIS with the in-built Python console. I want to replace some values in a shapefile with some other values. But when I try to change the attribute values, I get an error about the data ...
2
votes
1answer
37 views

Refreshing image in attribute form based on classifier using QGIS

We have two tables: road_signs (road sign points). lut_road_signs (classifier of road signs), this table has a column sing_img (blob) in which the image of road signs is written in png format. How ...
94
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6answers
217k views

Calculating polygon areas in QGIS

How do I calculate areas of an area shapefile in square meters (m²) or in acres (ha)? I didn't find that functionality in the Vector Tools.
0
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1answer
41 views

PyQgis Show a HTML frame in canvas from a plugin button

I am using PyQGIS to request a JSON and showing some data of that file, formatted according with some conditions, in a window in QGIS using a button in a plugin. I have thought of using a HTML frame (...
1
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0answers
22 views

Calculating value of string using array_foreach

I am relatively new to this, but I have an attribute table field (SPECIES_PR) where some fish species are delimited with a comma and I would like to evaluate each species in the string, then assign ...
5
votes
1answer
477 views

Using fields mapper in QGIS Modeler

I am building a modeler in QGIS 3.2.1, I want to use Refactor fields tool to change the name of a fixed field (fid to org_fid),This tool accepts a Fields mapping. I also noticed that there is a Fields ...
1
vote
1answer
44 views

QGIS custom coordinate reference system of a local site

I am creating a geo database for an archaeological excavation. We want to put data from a local system and from UTM35 in the same QGIS-project. I have Ground Control Points in both systems. I setted ...
1
vote
1answer
70 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~...
0
votes
1answer
49 views

Giswater plugin version 3.4

I am new to this. My Giswater plugin icon does not function upon clicking. But successfully installed. I have installed postgresql, pgadmin 3, enabled spatial extensions postgis and pgrouting,
6
votes
1answer
54 views

Line pattern fill missing when exporting as SVG in QGIS Print Layout

When exporting from Print Layout as a .svg-file in QGIS the line fill pattern disappears of all polygons. How can I stop this happening? The problem doesn't occur when exporting as an image file or ...
5
votes
1answer
71 views

Remove all but one lines in cluster of parallel lines

I just want one line that represents the centroid of a bunch of parallel lines, which one in each bunch doesn't matter. I've already tried doing a dissolve operation to make one thick line that ...
2
votes
1answer
126 views

QGIS Model Designer - Select by Attribute with Multiple Field Parameters

I am building a model that includes a 'select by attribute' algorithm, and I am attempting to select by multiple fields where the value matches a model input. Essentially, I want the selection query ...
0
votes
1answer
42 views

rscript in QGIS processing toolbox and Rstudio, results mismatch

I am using my own R scripts in QGIS. Before adapting them to work in QGIS, I write them in RStudio to make sure they work properly. I then use different scripts in a batch model. In RStudio I have ...
0
votes
0answers
24 views

How to make 3d stack bar and overlap in QGIS

This is a stack bar plot made by QGIS 3.18 (1st image). All I want is to flip the image and overlap this plot as 3D in QGIS (Like 2nd image). How can I do that?
2
votes
1answer
28 views

QGIS, Get and Save Features from distant server through REST API

I have a Web app where you can create geodata with OpenLayers. (Polygons and points). It's saved on a PostGIS database along with other non-geographic data. You can export the geographic data as ...
2
votes
1answer
114 views

Aggregating point data into polygons using QGIS

I would like to aggregate point statistics to a specific polygon layer which is a 100*100m raster. The point dataset includes address data of buildings and their heating energy consumption. So the ...
1
vote
1answer
38 views

Check if other features besides atlas feature are displayed in the map

I am making an atlas in Print composer and I want to check if other features besides the atlas feature are present in the map. In the Print composer map below, the (current) atlas feature is Licab, ...
1
vote
1answer
34 views

Identifying Europe's major road exits using QGIS

Dataset from EuroGeographic and Global Roads Open Access Data Set (gROADS) have been downloaded. The goal is to identify the exits (geocoordinate points) of highways and primary roads (gROADS refers ...
5
votes
2answers
96 views

Computing concave hull from points using PostGIS and display in QGIS

I'd like to create a boundary of a set of point using ST_ConcaveHull function in PostGIS My query works fine and I can see the polygon through the geometry viewer embedded in the pgadmin. CREATE TABLE ...
1
vote
1answer
25 views

Calculating a single number fra an array in field calculator using other fields

For my final project, I would like to assess the earthquake risk of populated areas in California. For this I have two multipolygon layers containing data for Earthquakes, and populated areas ...
1
vote
1answer
70 views

What is the simplest way to host a qgis2web export?

I am new to hosting web maps and would like to know how I can run a qgis2web export and embed a webmap url to sharepoint or share with others. How can this be done open source?
1
vote
1answer
72 views

FeatureClassToNumPyArray/other ArcMap functions in QGIS?

ArcGIS user here. Since we're all working from home now, ArcMap only works 2 VPN's deep and is basically garbage to us now at our office, so I'm going all in with QGIS. I would like to know, what is ...
0
votes
1answer
31 views

Vector (polygon) to raster conversion

I am trying to convert my vector file (polygons) to raster by assigning a 10x10 size to the pixel cells. However it gives me this error: I used as "Field to use for a burn - in value" a ...

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