Questions tagged [qgis]

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

9
votes
3answers
3k views

Find maximum radius of circle that will fit within an irregular polygon?

I have a problem which I think could be handled by using the Zonal Geometry tool in the ArcGIS Spatial Analyst toolbox. However I do not have a license for Spatial Analyst, so I am searching for an ...
0
votes
0answers
6 views

QGIS - point size and projection

I have a CSV with three columns: lat, lng and radius. The points in this CSV are located in Switzerland. I load the CSV in QGIS with the default EPSG:3857 WGS84 / Pseudo Mercator projection. I set ...
1
vote
0answers
8 views

Why do the Heat Map (QGIS) and Kernel density estimation (SAGA) tools provide different results?

The Heat Map tool (QGIS) and the Kernel Density Estimation tool (SAGA) provide different results for the same data as shown below. Why is this happening? Is one of them more conceptually correct? ...
1
vote
1answer
12 views

QGIS - Rendering Order: Layer Order > Symbol Levels > Feature Rendering Order

A similar question was already asked two years ago, but no answers were provided, things may have changed, or if not developers may now consider this something for a future version. Can I change the ...
0
votes
0answers
6 views

r.watershed.outlet and r.watershed error

I have a problem with the QGIS and in particular with "r.watershed.outlet". The problem stems from the fact that I can only use the plugin with one data at a time, if I send it as a serial process it ...
1
vote
2answers
77 views

Cost raster/friction map and data extraction

I am in an early stage of least cost paths analysis of a wide area. One part of the operation includes simulation of movement across the grid of previously agreed size of cells and extent of the grid (...
7
votes
4answers
1k views

Adding TauDEM provider to QGIS 3?

Is there a way to add TauDEM to the latest QGIS 3.0? I can't see it in the providers tab as it was in my previous 2.18.14 version so I am unable to activate it. I use it pretty regularly so I would ...
1
vote
0answers
9 views

Can QGIS be used to calculate the up-slopes (total area draining to a specified point) of multiple separate points simultaneously?

I am trying to calculate the area draining to a point of 240 separate points using QGIS. At the moment I'm using the Saga - Upslope Area algorithm to individually work this out for each of the 240 ...
2
votes
1answer
20 views

How do I create a column in an attribute tables which sequentially numbers features based upon a direction? QGIS 3.6

I'm trying to create a map which labels each parcel according to it's position along the red line, from West to East. I've tried creating a column which uses each features position within the ...
3
votes
0answers
17 views

Order of parameters in QGIS 3.6 graphical modeller

When using graphical modeler in QGIS 3.6 I have added additional parameters to the model inputs for the buffer tool. The model looks like this: When running the tool the order of the parameters in ...
2
votes
1answer
21 views

Using QGIS API to check which layers are being used in layout

I have a QGIS project with multiple layouts (in total about 30) in my layout manager. I used of the "Follow map theme" then "Lock layers" options in the Map item properties to make sure that each ...
5
votes
0answers
80 views
+100

WFS not working on QGIS for datatables

I created a QGIS 3.6 project on Windows Server 2016 x64 with two PostGIS layers: Layer A: Points Layer B: Datatable (No geometries) and configured QGIS Server options on the project like this: Now ...
0
votes
1answer
119 views

How to load Interlis1 files directly into QGIS 2.0.1 Dufour 64Bit (W7Pro)

With earlier version of QGIS (1.8) it was possible to load data in Interlis 1 format directly. If I try now it says something like unknown format. Is this because I'm using the 64Bit version of the ...
0
votes
1answer
50 views

Producing density map using QGIS?

I have placed a grid onto an open source Ordnance Survey map that corresponds to Ordnance Survey eastings and northings. I have a value for each grid square between zero and 30. How do I use these ...
5
votes
2answers
88 views

How to add text on top of symbols for vector layers in QGIS

I read the QGIS 3.2 Changelog and saw a new feature to add text on top of symbols for vector layers. Does anyone knows how to do this?
0
votes
0answers
24 views

ID for track points

I need the track ID for every single track point of buldings. Because I need to identify the buildings, to do calculations with their X and Y coordinates. How can I make those ID's from the attribute ...
9
votes
5answers
3k views

How to make Portable QGIS 3

Is it possible to make QGIS 3 portable with changed location for Qgis setup parameters folder. For QGIS 2 it looked like this in qgis.bat file: qgis --optionspath "X:\qgis" --configpath "X:\...
1
vote
0answers
6 views

How to keep the ids and attributes of the source features when creating a QgsGraph?

I followed the example in QGIS documentation for Network Analysis library to create a graph from a vector layer. When building the graph, the features of the line layer are added as arcs (edges) to ...
2
votes
2answers
46 views

Combining GeoServer vector tiles with QGIS

I am using QGIS 3.8 (or 3.4) with the vector tile plugin: https://github.com/geometalab/Vector-Tiles-Reader-QGIS-Plugin I've also installed the vector tiles plugin for GeoServer 2.15.1. The problem ...
1
vote
0answers
33 views

Extract QGIS style as geometry in a DXF

I have a qgis point layer with a complex data driven style: This is the style without other layers: When exporting the layer as Dxf I would like to also export the style so the symbols are visible ...
2
votes
2answers
460 views

QGIS go2streetview Browser display problem

In QGIS the go2streetview Plugin is there ready to go - the icon displays and the window asks you to click on map and drag cursor to display Google Street View. When this is carried out nothing ...
0
votes
0answers
21 views

QGIS 3.8 Batch Processing AttributeError: 'BatchInputSelectionPanel' object has no attribute 'value'

I installed the latest version of Qgis (3.8.0). When I try to run batch processing for contours, it gives me this error Is anyone else experiencing this? I cant seem to find a quick solution to this ...
1
vote
1answer
26 views

Calculating coordinates given a reference point and distance

I am using QGIS 3.6 and trying to calculate coordinates (lat&long) from a point given the distance. I have the lat&long for reference point and have the distance from the reference point. ...
1
vote
1answer
13 views

Saving Refactor Layer?

I used the toolbox to refactor attribute field names which worked well. However I then seem to have lost the changes as the layer was only a temporary scratch file. How do I save to make these ...
1
vote
1answer
50 views

Shapefile not showing in proper location

Working in QGIS 3.0.1; I just switched to QGIS and am trying to get used to it. I have a shapefile from SW Maps app of a track walked on hiking trails, and am attempting to make a basic map using ...
0
votes
1answer
17 views

QGIS spatial filtering expressions

Using QGIS 3.4 I have a set of points and I am using the atlas tool to generate reports for each point. I'm looking for a way to only create reports for points that intersect a polygon. These ...
2
votes
1answer
32 views

Compare two columns using Graphical Modeler in QGIS

I have a layer with several columns. One of them is called 'cod' and the other is called 'cod_2'. 'cod_2' is null, except for one row. I want to know if the numerical value of 'cod_2' is present in ...
0
votes
0answers
18 views

Odd Color Shift after Merging Rasters in QGIS

I have a large number of raster orthophotos that I'm trying to merge into a single image using QGIS. The merge completes but the color is significantly off afterwards, as shown here: This seems like ...
1
vote
1answer
27 views

QGIS only reads first polygon in KML file

I am new to QGIS and I am struggling to read in a KML file of polygons. I have a KML file that contains polygon information for a number of squares formatted as follows: <?xml version="1.0" ...
1
vote
1answer
28 views

QGIS 3 Edit Attribute Field Name

I want to change the name of an attibute field in QGIS 3. The duplicate referred to seems to require the plug in table manager which is no longer available. I have looked at properties and have spent ...
0
votes
0answers
20 views

Import jpg jgw into QGIS layer with Python and export layer as shape

I'm not so good with Python and QGIS. I try unsuccessfully to find the solution for the following problem: How to import raster .jpg image (having .jgw file) into QGIS layer with Python and export ...
1
vote
1answer
44 views

QGIS - exporting shapefile to convert to .JSON for use in PowerBI

I'm trying to export a shapefile I've been using in QGIS for use in PowerBI because PowerBI only supports .JSON extensions. So I've been converting them with mapshaper.org. This is my shapefile result ...
3
votes
3answers
68 views

Creating feature templates in QGIS?

I am drawing points that have different tags, for example, one is a Manhole other is a Headwall. I have my symbology setup in such a way that point displays differently based on tags. Now as I am ...
1
vote
3answers
55 views

QGIS Select by expression - buffer selection

I want to select points 2 and 3 with a 'selection with expression' in QGIS 3.4. I want to do this by using the buffer function in the expression builder. I already managed to create a separate ...
0
votes
0answers
34 views

How to create a block map in QGIS [on hold]

I am trying to create a block map for the first time and a bit unsure. I have a hard copy map of my area of interest which I have scanned and georeferenced to enable me have a soft copy. I am a bit ...
5
votes
1answer
83 views

QGIS- Model works on single layer execution, errors out when run as batch

I have a pretty simple model in QGIS that I am trying to use as a batch process. The model takes a line shapefile input, creates a temporary buffer, extracts by location using that created buffer, and ...
3
votes
0answers
26 views

GRASS not working with QGIS 3.7

Like the author of GRASS not working with QGIS 3.6, I am unable to use Grass plugins, with the error: This algorithm cannot be run :-( The specified GRASS 7 folder "C:\OSGEO4~1\bin\bin" does not ...
3
votes
2answers
136 views

Does QGIS 3.6.0 make use of GPUs in order to accomplish 2D tasks (rendering, zooming, panning…)?

does anyone know whether last versions of QGIS (like last one, 3.6.0) make use of GPUs (either integrated or dedicated ones) in order to accomplish 2D tasks (rendering, zooming, panning...)? If it ...
2
votes
1answer
38 views

Connecting ComboBox and pushButton for QGIS plugin

I am creating a QGIS plugin. I have added a combo box and a push button in the plugin. The issue that I am facing is that I want the ComboBox to either allow selection of layers from the layers ...
1
vote
2answers
56 views

Importing Excel into QGIS as layer and not as attribute table [on hold]

I'm trying to add Excel sheet as a point layer, that includes coordinates into QGIS. Instead of a shapefile, it comes as attribute table (layer name is shown and attribute table logo beside it ...
1
vote
0answers
9 views

How to Install QGIS Server on Debian Stretch

I am using QGIS version 3.4. I have downloaded training manual of same version. right now I am try to complete 12 chapter i.e., install QGIS server. Here I dnt understand where to give command or ...
4
votes
2answers
1k views

QGIS spatialite layers 'Could not commit changes to layer'

I am running into problems with saving spatialite layers in QGIS 2.18. To illustrate I am following this tutorial: http://www.qgistutorials.com/en/docs/digitizing_basics.html Creating a new ...
3
votes
0answers
41 views

Converting “From-To” matrix (wide format) to long format in QGIS? [on hold]

I am importing a csv matrix (non spatial table) |ALLIER |AISNE |ALPES |ALLIER | - |10 |200 |AISNE |70 | - |100 |ALPES |10 |100 |- What I want using Qgis |FROM |TO ...
0
votes
0answers
22 views

QField not syncing data back to QGIS

I've used QField to collect data and create features. When I try to use the qfieldsync plugin to transfer the layers and data back to my QGIS project, it only brings blank layers without any of the ...
3
votes
1answer
523 views

Grass 7 no longer works via the Processing Toolbox on Ubuntu

When I try to execute a Grass 7 algorithm via the Processing Toolbox in QGIS 2.10, 2.8.2 or 2.8.1, I get the following error: Missing dependency. This algorithm cannot be run :-( QGIS erroneously ...
0
votes
0answers
12 views

How to output raster that contains band numbers of pixelwise maximum values?

I have got a ndvi_2015.tif with 12 bands of monthly ndvi values (band 1 = January, band 2 = February etc.), which I used to create a summary raster layer using the max() function in R. Now I want to ...
1
vote
1answer
150 views

Using Uber-H3 from Qgis

How can I Create a spatial binning similar to or directly using Uber H3 from QGIS UI? Are there plugins available to achieve the desired task?
1
vote
0answers
18 views

Copy all features and attributes to a new dataset based on a template in QGIS Modeler

In QGIS desktop I can merge a template spatial file that has no data but all the attributes I need with another spatial file that has the spatial data where some of the attributes aren't in the ...
3
votes
1answer
222 views

How can I temporarily disable creation of QGIS project backup files (.qgs~) with Python?

Is it possible to temporarily disable the creation of QGIS project backup files (*.qgs~) with Python? I'm trying to save QGIS projects in Microsoft SharePoint, where the creation of *.qgs~ files is ...
0
votes
2answers
80 views

Merging layers with different objectid types

I have a problem that's stumped me. I'm merging flood hazard layers from FEMA. For most states, the objectid is a real number. California (we're always the weird ones) has an objectid that's '...