Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [qgis-3.0]

For questions about Version 3.0 of QGIS

2
votes
1answer
161 views

Reason for better save capability of QGIS 3

I have an internal processes meeting with work where I am trying to describe the benefits to migrating to QGIS 3 from QGIS 2. I need to explain the technicalities of how the save option works better ...
0
votes
1answer
23 views

Changing the attribute table view in QGIS 3?

How does one change the Attribute table view on QGIS 3? An initial answer says to use the "Switch to Table view" button but I can't seem to find this button.
3
votes
1answer
31 views

Listing all point items in polygon?

I'm trying to get a list of all points (from a point layer) that can be found in a unique rectangle polygon. Input layer 1: points (address data) Input layer 2: rectangle polygon layer (created with ...
0
votes
0answers
7 views

Inverted polygon not displaying on printout

I'm printing from the layout in QGIS 3.2.2, using Windows 10. The page size is 42x42 inches. I created an inverted polygon to cover up layers that were outside of the main polygon. I printed ...
1
vote
1answer
29 views

Showing OSM source acknowledgment on the map in QGIS?

I am using OpenStreetMap as a base layer via XYZ tiles in QGIS 3.01. I can't seem to find a way of having source acknowledgement appear on the lower right corner of the map. Can somebody point me in ...
1
vote
0answers
18 views

Dissolve with stats plugin does not appear in QGIS 3.0

So far we have tried to: find it in the plugin repository from QGIS, with no luck. install the plugin downloading it from the web QGIS Python Plugins Repository: https://plugins.qgis.org/plugins/...
4
votes
2answers
58 views

Custom scalebar with half-segments in QGIS

I am trying to recreate a scalebar thats part of a norwegian standard (NS3039) in QGIS. QGIS makes these half-segments for negative values (highlighted in red in the picture below 1, but I want ...
1
vote
1answer
22 views

Why a QgsExpression does not evaluate a feature as expected in PyQGIS 3?

When I run following code in QGIS 2.18: layer = iface.activeLayer() expression = QgsExpression( u'"area" > 2e8 AND "area" < 3e8' ) feats = [ feat for feat in layer.getFeatures() ...
1
vote
0answers
57 views

QGIS 3 calculate totals and display on the map

I have recently started using QGIS 3, at a very basic level really, I am displaying radio coverage drive test logs which are in tab delimited format. I have sucessfully imported the file, and written ...
0
votes
0answers
16 views

Alternative of Web App Builder

I'm currently using: QGIS 3.2, OS: Linux (Ubuntu) The Boundless plugin i.e. QGIS web app builder isn't supported on QGIS 3 version I guess. I tried installing it through the zip file method but ...
9
votes
4answers
716 views

Buffering only sides of polygons in QGIS?

My goal is to create a buffer from a polygon. But the edges are the problem. I can't really explain it in words, so I will post a screenshot. That's the way I want it to look. So the goal is, that the ...
1
vote
0answers
35 views

How to recenter extents of my coordinate system in QGIS?

How do I change the extents of a projection of the world so that longitude 90W is centered? I'm working in WGS84. Perhaps I need to add some clarification of my objective. I have a dataset of the ...
9
votes
2answers
156 views

Drawing viewpoint-symbols in QGIS?

I made a viewpoint symbol in QGIS by styling a point to be be a circle and adding some lines that are rotated at different angles, and it ended up like so In a perfect world I would rather this ...
2
votes
2answers
49 views

Merging attributes in QGIS? [closed]

I have a layer with several polygons making up a division together. They all have attributes with population. Is it possible to add up the population in a merge so I don't have to use a calculator ...
0
votes
0answers
7 views

Displaying picture in QGIS 3.X custom form (QT designer)

I have a problem with a function that worked well with QGIS 2.X but not with QGIS 3.X I want to display an image in a form made with QT designer. I followed this: In QtDesigner Add a new QWidget ...
5
votes
1answer
76 views

Creating unique buffer for each set of points separately and in one procedure using QGIS?

How could I create a buffer for each set of points (colour group) separately and in one procedure in QGIS 3? The image below shows a subset of points for buffering.
0
votes
1answer
34 views

How many themes can I create in QGIS?

How many themes in layers box can I create in QGIS 3.0?
2
votes
0answers
17 views

Copy polygons to another layer with different attribute

I am working in QGIS 3.0.2-Girona. I am digitizing images in which there are rocks that can be encrusted, totally or partially, by algae. I want to have a polygon for the rock and one for the algae. ...
0
votes
1answer
25 views

How to set checked “Auto Open Form” in identify results window, programatically?

I want to set check programmatically "Auto Open Form" check box in Identify Results window. Window is here and the check box is at the bottom-right: The Identify Results window is not open at that ...
0
votes
0answers
11 views

Error in executing “Export DXF” from main menu

I have recently found the tool Export DXF that transfers attribute table information along with the geographic location data from a shapefile to a dxf file. However, I have found that sometimes a ...
0
votes
0answers
20 views

Getting LayoutItemLabel from layout QGIS

I'm trying to modify selected layout items in a QGIS Layout using the python consol. I'm using the following code to access the selected items from the layout projectInstance = QgsProject.instance() ...
-1
votes
0answers
16 views

Invoke OSGeo4W shell from java and run standalone python script

I have made some GIS functionality using PyQGIS 3.0 and then I wrapped the whole thing so that I can create a standalone python application using PyQGIS. My next task is to run this python script(...
1
vote
2answers
46 views

Usage of ELSE Conditional Statement in QGIS Field Calculator

I have an issue about how to change some data in a field not affecting unrelated data. I want to replace '(space)' between words in label_geo_ field data by this '_' sign when (if) this sign appears ...
0
votes
0answers
14 views

Issue with qgis 3graphcis

I am using the latest installation of QGIS (3.2) in a Macos Sierra 10.12.6 and I get those graphic issues on the top left of the software (see image). Also when I go to full screen the tool tabs get ...
1
vote
1answer
18 views

Using “Difference” geoprocessing tool on Big Data taking a very long time

I am using QGIS Bonn 3.2.3. I've recently been using the Difference function to calculate a list of points and it is taking a terribly long time. I was wondering if you could point out any obvious ...
2
votes
2answers
169 views

Make polygon circular in QGIS

I have drawn a polygon in a shape-layer, but it's not perfectly circular. Is there a way to either Draw a circular polygon with a given radius (in a shape-layer) Make a polygon into a circle I have ...
0
votes
1answer
64 views

Large Export Issues - QGIS 3.2.2

Still pretty new to GIS, but Ive been working on assembling a map with ~20 vector layers over the past couple of weeks. Its finally to a point where Im ready to export. Ive been experimenting with ...
0
votes
1answer
26 views

Using PyPDF2 in PyQGIS 3!

I use PdfFileMerger from PyPDF2 in a plugin that I want to migrate from qgis 2 to 3 but it seems that this lib doesn't exist in qgis 3 (python 3.6). How I can do this?
1
vote
1answer
89 views

OSM data does not match

I downloaded OSM data for Austria from Geofabrik and converted them with ogr2ogr into a SpatiaLite db so that I could use some Google Maps style sheets I found. Until here, everything worked very ...
2
votes
1answer
66 views

Migration plugin from QGIS 2 to QGIS 3: list layers

I am trying to migrate a plugin from QGIS 2 to QGIS 3. This function doesn't work with QGIS 3 : def getLayersByKeyWord(keyword): #retourne une liste de layer res=[] layerMap = ...
0
votes
0answers
25 views

Exporting into Excel file from PyQGIS?

The following code allows me to save a text file with .xls extension in Python. When I open it, I receive the following warning: The file you are trying to open, is in a different format than ...
1
vote
0answers
31 views

QGIS r.clump function not working?

I am trying to follow this course "https://www.youtube.com/watch?v=IfZSyBf6o84", starting from 20:00, and failed to reproduce the clump function based file, as the warning message shows: Anyone have ...
2
votes
0answers
31 views

Changing the Location of Python Expressions QGIS3

I've recently started using QGIS and I've written a few custom functions to use with expressions in the Function Editor (see image below) From what I can find these appear to be saved in: C:\Users\...
0
votes
0answers
31 views

QGIS Proximity(Raster Distance) doesn't work, 'C:\PROGRA~1\QGIS' is not an internal or external command

I would like to apply the QGIS Raster Distance function, exactly as shown in this video: https://www.youtube.com/watch?v=IfZSyBf6o84, starting from 7:00. but it doesn't work for me, the message ...
2
votes
1answer
64 views

QGIS: I can barely see the labels in layer panel

So, I finally bit the bullet and upgraded to QGIS 3.2.3 Bonn. However, for layers that are not turned on the font is a super light grey in the layer panel and I can barely read it. How can I change ...
6
votes
3answers
117 views

Programmatically changing line lengths in QGIS?

Provided a set of lines with various lengths, I would like to change their lengths (hence, changing their geometry) to a specific value, using their centroid as base point. I have checked the ...
0
votes
0answers
34 views

Combined style-file for shape-points, lines and areas

We have three QGIS Layer Style files. One for shape points, one for shape lines and another for shape polygons, which we load unto our datalayers to make the analyses we create look like they have to. ...
2
votes
1answer
34 views

Arranging GUI elements in QGIS 3 processing model user interface

Using QGIS 3 graphical modeler I created a model with a variety of input parameters (> 10). When starting the model, a nice user interface is generated. But the arrangement of the GUI elements is ...
2
votes
1answer
52 views

Changing Layer CRS Causes Misalignment and Scaling Issues [closed]

Update: My final solution was to re-download the data sets and all my alignment issues were solved. Background: I am working on a personal project overlaying the location of churches/parishes on ...
1
vote
0answers
34 views

How to fix self intersected polygons visually, as well in QGIS?

I have same invalid polygon features because of self intersection. I can make them valid by using fix geometries tool in QGIS 3.2. However I want to show them valid visually also. The feature is valid ...
1
vote
0answers
16 views

QGIS 3 processing script won't show gui when executed from editor

Different from QGIS 2, when I execute a processing script from the Processing Script Editor by pressing the Play-button in QGIS 3 it's GUI is not created. Seems to me that the initAlgorithm() method ...
3
votes
1answer
55 views

Update processing scripts in QGIS 3

When I edit a processing script (QGIS 3.2) with right click > Edit script... in the processing toolbox, save it and then try to execute it by double clicking it in the processing toolbox, the version ...
1
vote
1answer
57 views

Getting and setting the symbol sizes for a graduated layer in QGIS 3

I have a whole set of maps that have graduated colors based on a set ramp and I also like to change the symbol sizes as it makes anomalous areas stand out even more. Id like to change the symbol sizes ...
4
votes
1answer
105 views

Iterate through list of field names and calculate fields with PyQGIS?

I am using QGIS 3.2.1 Bonn 64 bit on Windows 10. I would like to loop through a list of field names and perform calculations on each field. Only the first loop in the iteration performs any ...
1
vote
1answer
44 views

PyQGIS scripts outside of QGIS GUI running processing algorithms from GRASS provider

I'm writing a script that I would like to work outside of QGIS GUI. The script uses the processing algorithm standalone just fine for the native algorithms, however I am experiencing errors when ...
0
votes
0answers
27 views

OSM original and exported polygons don't match

I'm having trouble to understand why polygons from OSM after being both copied and exported to a different layer don't cover their originals. Blue are the new one, with black outline - the original ...
1
vote
1answer
19 views

Keep only endpoints of line with Extract Vertices

Using QGIS 3.2, I can use the "Extract Vertices" tool to generate a layer of vertices for each line segment in my data. My data is split into line segments of between 400-500m in length (using the v....
2
votes
0answers
35 views

What to use instead of 'Table' input in QGIS 3 modeller

In QGIS 2 graphical modeler I had an input parameter 'Table' for spreadsheets, csv etc. with no geometry. By now, I'm re-creating all my existing QGIS 2 models from scratch (cp. Using QGIS 2.x ...
1
vote
0answers
57 views

Datum transformation in QGIS 3

I have an Esri shapefile with following in the .prj file (broken into multiple lines for comprehension): PROJCS[ "SGL_Stereo", GEOGCS[ "GCS_SGL_GEO", DATUM[ "D_SGL", SPHEROID["...
0
votes
1answer
43 views

GML axis order problem in QGIS

Is there any reason why QGIS swap axis order if CRS (EPSG:3908) is defined inside GML, for example: <au:geometry> <gml:MultiSurface gml:id="_42d05737-123d-4a52-a655-aef968cd9511" srsName=...