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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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6 views

Tools and methods for spatio temporal analysis in GPS data? Identify bottleneck, idle time etc [on hold]

I am fairly new to QGIS and hence need some advice for which tools to use and some points in the right direction, for the analysis I am about to conduct. Basically I have GPS tracking datapoints for ...
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0answers
15 views

Problem to create line in QGIS 3.4.4 and 3.6.0

I'm having a problem to create a line in QGIS. When I right-click to create the line, the input is not received and the line is not created. Does someone else has the same problem?
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0answers
19 views

Adding points to osm file in QGIS

I have downloaded an osm file from Geofabrik download server and opened this .osm.pbf-file in QGIS. So there are 5 classes - lines, multiline strings, multipolygons, other_relations, and points. I ...
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0answers
11 views

How to get measured angle value using PyQGIS?

We can measure the angle using the GUI tool in QGIS but how to get that measured valued in python console using PyQGIS .I have to rotate text along with angle value in attribute table but can not able ...
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1answer
14 views

Polygon from shape extents in QGIS

In QGIS 3.4 is there a tool similar to the Extract Layer Extent but instead of a bounding box, it creates polygons? I have groups of lines representing a network of roads and I want to show the ...
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0answers
10 views

QGIS3 - Exporting DXF, what encoding type for backwards compatibility? / Adobe Illustrator

I am having some trouble with my project which has been exported in the .DXF format. When exporting DXF there are many different encoding options, hopefully there would be one that works in my ...
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0answers
14 views

QGIS: default expression won' t write to database

Made this expression and put it in the defaults value box.: CASE ---cardinal WHEN ("CATCAM" = '1')THEN'2,6' WHEN ("CATCAM" = '2')THEN'2,6,2' WHEN ("CATCAM" = '3')THEN'6,2' WHEN ("CATCAM" = '4')THEN'...
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1answer
18 views

QGIS 3.4 Stream delineation problem, lines running too far into ocean

I am using QGIS 3.4.4 Madeira version trying to delineate the stream and catchment areas of a small Bay in Honduras based on the technique of Hanz van der kwast tutorial "Stream and Catchment ...
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0answers
10 views

Add a Google Earth Enterprise globe (from geserver) to QGIS

I am managing Google Earth Enterprise, where I can add data to Fusion, push it to geserver and then publish it to Google Earth Enterprise clients on people's computers. But the people need to add a ...
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0answers
16 views

Can relation reference in QGIS and QField be used to fill stochastic matrices?

I am a novice GIS user and am just seeing the potential for relations in my work. A problem I've come across and would like a solution to it. I have two stochastic matrices (risk matrices) that ...
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0answers
21 views

Advanced Python Field Calculator - QGIS Processing Toolbox

I'm trying a very simple task. I want to write the layer name in a new attribute column. I succeed in using the "Field Calculator". But I need to do the same for a lot of files using the "Advanced ...
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1answer
18 views

Algorithm addgeometryattributes not found

I am trying to find area and perimeters of Polygon using Pyqgis3. I tried manually first Vector->Geometry Tools->Add Geometry Attributes. By doing so, I get the area and perimeter column in the ...
3
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1answer
58 views

QGIS Geometry Generator Line Type

I am trying to create a line style for a multiline geometry. I am hoping to create a linetype which looks like the following The Points are not an issue, its the line/lines entering and exiting at ...
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1answer
41 views

Maintaining Borders when Merging shapefiles?

I am trying to merge two layers of a map which includes the state and county levels. I was able to edit the borders to look how I want, but when I merge them I am struggling to keep the style ...
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0answers
19 views

Presenting A Map of Work Progress in QGIS Server? [on hold]

I have a problem I'm trying to solve with regards to presenting completion metrics by location. I don't have a software budget to work with, but I do have a server to use and Alteryx and Tableau ...
2
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1answer
69 views

How to reinstall QGIS 2.18 as qgs-ltr

I updated QGIS and accidentally rewrote 2.18 as ltr with 3.4 Madeira. My apps work with older version. This means there must be qgis-full and qgis-ltr with version 2.18 to make them work correctly. ...
2
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0answers
45 views

Interpolation of data points

I have a layer of points that represent bus stops. Each point has a value (quality of service, between 0 and 100). I need to create a grid (resolution 25m) by interpolating the points values. For ...
2
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0answers
12 views

Can I symbolize based on the syntax in a description attribute colum?

I got a kmz-file from an organization and the attribute table has a colum 'description' with a synthax that holds import information (such as date built, water source, village etc.) instead of a ...
1
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1answer
47 views

Where to find out about QGIS new versions?

What's the right way to find out about new current QGIS version releases? I'm on Win64 and use OSGeo4W. The roadmap gives dates for new releases, confirmed by the main web site header which lists ...
1
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1answer
40 views

Problems with QGIS3 Vertex editor

I'm having trouble adding new vertex using the QGIS3 Vertex Editor - I'm using QGIS version 3.4.1-Madeira. I tried following the instructions provided in answer to a previous question 'How does ...
1
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0answers
21 views

How to scale up a reference image in QGIS?

I'm creating a fictional map and I've made a raster of it in Photoshop. I've added the image by dragging and dropping it into the program. I also have an OSM layer as reference for the size I need my ...
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0answers
23 views

How to get full attribute list of selected feature in PyQGIS?

Following code gets the feature which is chosen by mouse click.But I want to get list of all of the attribute name and values using script of that selected feature.Can anybody provide the method ...
4
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0answers
28 views

Referencing an output in an expression in process modeler

In the process modeler, I'd like to reference an output of a previous step as one of the parameters of an algorithm. In this case, the previous step was clipping a large raster and I want to use the ...
1
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1answer
42 views

Grid net contour/outline QGIS [on hold]

How to make a contour/outline of grid net polygon? Just need a thick boundary of the grid net to make the result more "beautiful". I tried to do it somehow in symbology, but unsuccessfully.
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0answers
20 views

QgsVectorDataProvider capabilities not available in QGIS [on hold]

I am trying to use deleteAttributes on my vector layer to delete attributes, but it does not work the attributes are not deleted. layer.dataProvider().capabilitiesString() gives the following output:...
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0answers
9 views

QGIS - Scanning speed of MSSQL Connection

I notice in QGIS (currently using 3.4.2) when connecting to a SQL database it takes a while to load all of the layers as it scans through the database, meaning if I go to select a feature to drag into ...
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0answers
8 views

QGIS SQL Server Connection Not Refreshing?

In QGIS 3.4.2 and previous versions, if I make a change in SQL Server such as adding a new SQL table with geometry, I cannot get QGIS to show this change. Refreshing, deleting and readding the ...
1
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0answers
35 views

Creating title blocks in QGIS

I am trying to create a table in composer to be positioned at the base of the map and is essentially a title block to provide information in text, image and table form. The only success I have had is ...
1
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1answer
33 views

QGIS - Vector Menu no longer working [on hold]

The Vector menu no longer works. All the other menus drop down and show the different options available. Here is the error message shown upon startup. I do not know if this is linked to the Vector ...
1
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2answers
32 views

Filtering out labels surrounding active feature in Atlas

I am using QGIS version 3.4 to create atlas maps utilzing a polygon coverage layer of 19 watersheds. Everything works fine in layout as I can jump/zoom to each desired watershed map. Furthermore, to ...
-1
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0answers
36 views

Panels turn invisible

I have a problem with the 3 panels I use : 1) Layers panel : I have a project with the Layers panel visible. When I close the project, and open it again, the panel is not visible any more. I can get ...
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2answers
32 views

Joining QGIS Property Parcel Mapping shapefile to an Excel file and displaying symbol in Parcel Mapping Shapefile

I am new to QGIS. I am a land surveyor and I have all of the property parcel mapping information in a shape file for my area. I am trying to link/join an Excel file which has all of the survey files ...
1
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2answers
48 views

Selecting latest date with QGIS field calculator?

My shapefile contains columns like "Street", "number" and "date". What I want to do is, to find the latest date (where we have done house services). If we have 2 dates for one house number ("number")...
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1answer
24 views

Style a feature in one layer based on an attribute in another layer in Print Composer Atlas

I have two layers; one is the foreground and the other a background. Both layers have fields containing similar values (field values in the foreground layer (mun_code) is also present in the ...
0
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1answer
40 views

Generating Tiles with QGIS

Is there any in the year 2019 working plugin? I try QTiles but this make errors (https://github.com/nextgis/QTiles/issues/100). So I need an alternative that is working with QGIS 3.6 How I can produce ...
1
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0answers
21 views

How to properly uninstall OSGeo4W+GRASS+QGIS on Windows7 64bit

Over the years I have tried QGIS and other mapping systems. Lately I wanted to make a go at using the newer versions of QGIS but wanted the ability to run the new one, 3.4 or 3.6 and to keep the old ...
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0answers
31 views

Converting large NetCDF daily precip data to monthly averages [on hold]

I have a large NetCDF file containing daily gridded precipitation data for around 30 years and I'd like to create monthly average precipitation rasters from this. I've had a look around and the only ...
1
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0answers
65 views

Shapefile not working in QGIS

I am a beginner with QGIS. I downloaded from different websites administrative levels for a country (0, 1, 2), full package: dbf, shp, shp.xlm, snb, shx, sbx, sbn, prj etc. However, QGIS is not ...
1
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0answers
29 views

QGIS Modeler - Select by expression error

QGIS Modeler works fine with my data if I store the layers as temporary layers, but soon as I will save the output in the selected folder (as shapefile or geopackage) I get a wrong result. The select ...
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0answers
22 views

Georeferencing via GDAL

Plugin GDAL didn't work on my qgis 2.18.17. I'm working on linux mint 19 Installed version : Version 3.1.9 (dans /usr/lib/qgis/plugins/libgeorefplugin.so) How i can change the version of GDAL?
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0answers
26 views

Modeler with optional inputs or none?

I have a need for a model that all the input may be optional and allow the "Selected features only" option. So, I developed a model that fakes it all as seen in the example below I realize that some ...
-1
votes
0answers
60 views

QGIS - merged/serial maps printing/exporting possible (like a merged letter in Word)? [on hold]

I need to create around 50 maps (= export PDFs) that all contain the following elements that remain the same for each map: Background map (raster) Polygon showing an area that contains property ...
2
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0answers
57 views

Method in QGIS to do a select by radius but ignore “islands”

I am looking for a process in QGIS to run a selection from a given point based of a radius that ignores "islands". For example you may have a body of water which acts as a natural barrier past which I ...
0
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0answers
13 views

QGIS 3 - ERROR 6: SetColorTable() only supported for Byte or UInt16 bands in TIFF format [on hold]

I'm getting this error when trying to use the r.resamp.filter in QGIS 3.4.4. The tool raises this error in the log. None the less, a raster is produced, but it has the exact same values as those of ...
3
votes
1answer
92 views

Making grids in QGIS

In QGIS I am trying to make a map with the Maidenhead Locator System overlayed. I am making these overlays with QGIS's create grid tool but the grids are not coming out right. If I leave the map ...
1
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0answers
25 views

QGIS library to OSGEO library codes

is there any way to convert the scripts which is produced in QGIS as python scripts from processing modeler to codes using osgeo library codes? i want some codes that can be used in QGIS algorithm in ...
2
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0answers
27 views

Do I need the standalone GRASS app if I have the GRASS Plugin and Processing toolbox enabled in QGIS? [on hold]

What processing abilities does the standalone GRASS GIS application have that aren't available in the QGIS GRASS plugin/toolbox? I'm trying to understand whether you would need/want the standalone ...
0
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0answers
34 views

QGIS road style appears blocky, I want it to appear continuous. Is there a style merge function or something similar? [duplicate]

If you look closely and see the main roads, they break down into blocks [][][][]. I was wondering in QGIS how can I have them appear continuous and not blocked up as shown below. This is one file ...
2
votes
2answers
36 views

QGIS how to sum a certain vector field inside a polygon and populate a field in the polygon?

I have a polygon with vector point civic addresses inside it. Each civic address has a different number residence. I want to sum the total number of residence inside that polygon and it populate a ...
0
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2answers
29 views

QGis 3.4.4 Create Atlas - one geometry per page

I have a shapefile with 50 Polygons. I want to create one PDF file in which I see only one polygon per page. I think I have to use the Atlas function. But I don't know how to Setup the filter.