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Questions tagged [qgis]

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

0
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0answers
2 views

processing.run(“qgis:rasterize”)

As i understood as from QGIS 3, processing algorithms support 'memory:' outputs. I am trying to process a lot of data and i would like to use as much in memory processing as possible. Since my vector ...
2
votes
0answers
20 views

Aligning road names in a row in QGIS

I am trying to align road names in a row, or column as much as possible in QGIS. I know it can be done in Adobe Illustrator with a mapping plugin, but I don't have the $$ for that. I tried something ...
1
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0answers
11 views

Call QGIS geoprocessing Tool from command line (terminal, bash-script)

Is there any possibility to call tools found in the QGIS processing toolbox from the command line, other than using python? It is my understanding that if you use any GDAL tools, the QGIS gui is ...
0
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0answers
19 views

Qgis Python console not working

I have a small problem with the Python console in Qgis. I am working through some code .py but lately the console does not show results, for example I write directly on the cosola print "prueba" ...
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0answers
8 views

qField Coordinate Reference System

Does anyone know how location services on your mobile device compare to a chosen coordinate system set in the qGIS project? I am wondering how to improve the accuracy of my device compared to the ...
-2
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0answers
25 views

How can I determine route of midpoint? [on hold]

I have an N of points and midpoint on the map and I want each point to follow the shortest route to reach the midpoint. Can i use NextGIS to solve this problem and how can i do it? or use ...
2
votes
1answer
27 views

Rasterize (vector to raster) QGIS 3.4

I am trying to rasterize a vector with the QGIS 3.4 rasterize tool (not saga or grass tools). I prefer using this tool cause it is much faster. The values which i would like to burn are found in the "...
0
votes
1answer
33 views

Can't delete features from layer tables in QGIS

I have some layers containing DAT,MAP and TAB files, when I loaded these layers into QGIS some layers have check boxes before layer name and some layers won't like showing in below image. In the ...
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3answers
34 views

Finding feature extents (not layer extent) in QGIS?

How can I find feature extents for each multipolygon in QGIS? for feat in layer.getFeatures(): I want to calculate extents for each feature here.
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0answers
28 views

QGIS tools fail with spaces in output file names

When I use tools in QGIS they generally work. However, when I use them in batch mode, they generally fail. The difference is that running once I can save results as a temporary file, but in batch ...
0
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1answer
11 views

Accessing Zonal Statistics for QGIS on Mac?

I've just updated to QGIS 3.4 for my MacOS (10.12). I'm trying to run some occupancy analyses and am looking to extract attribute data for a polygon grid from an underlaying raster file. ZonalStats ...
0
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1answer
45 views

Merging 1m DEM to 30m DEM?

I have a base 30 m.Dem . However, i also have 1m Dem for an area of interest only. I would like to overlay the 1m Dem on the 30 m Dem meaning the area of interest will have 1m and the rest 30m. Is ...
1
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1answer
24 views

Adding ArcGIS Online Webmap to QGIS?

I am very new to QGIS and I am wondering is there a way to add this map to QGIS. The map can be found on: https://glasgowgis.maps.arcgis.com/apps/webappviewer/index.html?id=...
0
votes
1answer
13 views

QGIS unable to perform point snapping to line. OS: Windows+Mac ElCapitan

I have been trying to snap points from a shapefile to a line feature from another shapefile. However, each time I do this, I get the following error(s) (depending upon the OS used): (For OSX El ...
0
votes
0answers
15 views

Highlighting feature in qgis2web leaflet when using search field? [on hold]

I am looking to highlight features (in my case a path - polygon) when searching for something in qgis2web (in leaflet it only pops up as a circle) this is possible in an openlayers map by default in ...
1
vote
1answer
32 views

Is it possible to load a WMS aerial photo from a external map into QGIS?

Is it possible to load a WMS based aerial photo (like https://geoinfo.frankfurt.de/luftbild-2018) into QGIS and use it as a background-layer for internal use?
0
votes
1answer
20 views

Exporting images attached to a geodatabase using QGIS

I have an ESRI file geodatabase that was exported from their survey123 app, and the geodatabase has images attached to it. I do not use ArcGIS, and was wondering how to export them from QGIS with ...
0
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0answers
28 views

QGIS Install Help: Library Not Loaded / Image Not Found

I'm having trouble updating to QGIS 3.4.4. Following install, the program does not open. I have Python 2.7 and 3.6 installed. I also downloaded and installed GDAL 2.3 from https://www.kyngchaos.com/...
0
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0answers
33 views

Counting rooftops in QGIS? [duplicate]

In part of a city, I am trying to count rooftops on a basemap/Google satellite in QGIS and create several polygons around x number of rooftops in the area. Is there anyway to count rooftops in QGIS?
1
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0answers
22 views

QGIS crashes when toggle editing for the child layer in a QgsDualView

The crash occurs for : Ubuntu 18.04 bionic QGIS 3.4.2 For reproduce the crash, I use these data : https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/...
0
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0answers
29 views

Creating polygon from DXF file using QGIS?

I want to create a polygon from a DXF file. I used v.in.dxf to convert the DXF file to GRASS vector map format. when I run the polygonize algorithm, it gives me the following error message(here I used ...
0
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2answers
30 views

Using the Expression String Builder to ultilise specific data within an attribute table

I have an issue relating to the 'Expression String Builder'. I have a series of data over a 8 year period. I need to collect that data for only a 5 year period. Once collected I need to find the ...
-2
votes
1answer
48 views

How to select a point from existing points within each grid in QGIS

How to select a point from existing points within each grid in QGIS? the condition is each grid has multiple points exists and these points have 3 types of data on its attribute table at column (...
2
votes
1answer
32 views

Changing apparent scale of tile layers [on hold]

There's loads of web-based tile layers out there which are great in many ways, but one problem I'm having is making them look nice when exporting a map to print or as a jpeg. The problem consistently ...
0
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0answers
15 views

r.grow in GRASS not working at all

Everytime i try to use the r.grow module from GRASS in QGIS (3.0.0 "Girona") i get this error Any tips?
3
votes
0answers
45 views

QGIS 3.4.3 - Scale bar not accurate

I'm a fairly new user to QGIS and was trying to generate a map of Iceland. However my grid scales are not matching up. The base map I'm using is Esri National Geographic which uses crs- EPSG:3857 - ...
1
vote
2answers
71 views

Understanding law or etiquette when applying changes to open-source software, specifically QGIS?

I am interested to know if there are any laws or etiquette surrounding the use of people's third party plugins or QGIS itself. What I am especially interested in is when a user accesses your code and ...
0
votes
1answer
25 views

How to maintain OpenStreetMap labels/details (from QuickMapServices) when exporting from QGIS? [duplicate]

My question is about OpenStreetMap place labels in QGIS, and how to keep them at a similar size when exported to as they appear in the software. I realise variations of this question have been asked ...
1
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1answer
44 views

Polygons are unable to be edited and have no feature, although they are listed in attribute table with three features

I found that several lakes in the GRanD database (global reservoirs and dams) are unable to be selected for editing like normal polygons, and they have no feature at all, although they are shown in ...
0
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0answers
27 views

Loading XYZ tiles in QGIS?

I have a tiles set in a local directory and I want to upload it in QGIS 3. The steps I have been following are: Browser > XYZ Tiles > New connection > Name: Amelia IGM1:25K > URL: file:///C:/DATA/...
1
vote
1answer
36 views

QGIS: Placing points relative to a specific coordinate

I have some delimited-text point data that is encoded as X,Y positions relative to a given coordinate. So, for example, 1 5 represents a point 1 meter east, five meters north of the origin coordinate. ...
0
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2answers
28 views

QGIS: Getting Concurrent mapset locking error using V.transform

Using QGIS 3.4.3 I'm trying to carry out a simple v.transform task shifting x and y But I'm receiving the following errors - and output shapefile is empty. Processing algorithm… Algorithm 'v....
2
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0answers
24 views

What is a general purpose of “Update SQL layer” in QGIS 3?

Can someone explain to me, what is a general purpose of "Update SQL layer"? When I "update" it becomes not editable... (see gif ▼)
0
votes
1answer
36 views

Automatic layout scope and scale

I have only one shapefile with multiple polygons. Every week I make updates to this shapefile, including new polygons, changing the shape of others and deleting other polygons, that is, this shapefile ...
1
vote
1answer
34 views

Disconnected features in Python, QGIS

I'm working with code from the Disconnected Islands plugin in QGIS x64 and Python. Normally, the plugin ends by writing the FID of features to a CSV and their corresponding network group ID. Instead, ...
1
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0answers
21 views

Select and make output points as required on QGIS?

I have two features: 1. Polygon (vector.shp). 2. Database (.csv). using processing modeler with below conditions: If no point in the cell, then leave as it is. If only one point, then pick that ...
2
votes
0answers
37 views

Error whilsted using QGIS 3.4.4 r.series batch processing

I'm having some trouble using the Batch Processing to perform r.series, Could anyone explain what I'm doing wrong? I'm using QGIS 3.4.4. Output Log: Processing algorithm 1/1… Algorithm r.series ...
0
votes
1answer
42 views

Summing flow from cities listed in another layer within QGIS?

I have transport flow represented by arrows within QGIS in one layer. The database is coded with cities ID for the origin and cities ID for the destination of the flow. I also have in another layer, ...
1
vote
1answer
38 views

Rotate SVG marker angle based on each feature's value

I'm importing data, and creating a layer, which has a number of features, each with an f_angle attribute. I'd like to create a data defined override to rotate the SVG marker by the angle defined by ...
1
vote
0answers
42 views

Rule-Based Styling not working in QGIS?

I'm trying to create a shapefile I can use as a template for a breeding bird survey. The basic gist was that each species has a two letter code and a colour depending on the BTO listing. Each bird is ...
1
vote
0answers
22 views

QGIS GDAL driver error

I'm unable to complete processing in the Processing Modeler due to the following GDAL Error: 2019-01-21T10:47:12 CRITICAL Could not create raster output E:\QGIS\QGIS_Projects\GDALTEST: GDAL ...
0
votes
0answers
14 views

How can I use Evis in QGIS for more than one photo name in a cell divided by a comma?

I'm using Evis to see a photo having the name in a cell of the attribute-table. When there's a single photo name there's no problems, but I can't see multiple images when I have multiples names ...
2
votes
1answer
55 views

Creating list of intersected polygons for each line using QGIS?

I have a line layer representing transport routes. I would like to add a virtual layer listing every city crossed by each line. I would only need the id of each city to be listed (column Code_INSEE)....
1
vote
1answer
46 views

Different result with Query builder and the processing 'extract by expression'

I have a attribute table (xlsx sheet imported with the plugin 'spreadsheet layer'). For example, it contain only 15 lines I have filtred the data with this request that return 6 lines (correct result)...
2
votes
1answer
85 views

How to delete custom color ramp in QGIS?

I have customized a new color ramp in qgis. Now I want to delete that. I could not find any way to delete this.
1
vote
1answer
47 views

Displaying Drill hole data in QGIS?

I have a large dataset of multiple drill holes that have been tested. The sheet is an excel sheet and contains the holeID, depth, easting, northing and assay results. example: Is there a way I ...
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0answers
24 views

Using QGIS in Web? [on hold]

I would like to have QGIS in an Angular project where map should be possbile to load, edit and save in postgis. Is there any reference to meet my request?
1
vote
1answer
32 views

How to project black lines in one image onto a shapefile?

I made my shape file transparent and started drawing lines on the top of it using base map. It will take lot of time to do the same for all coloured pallets. Is there an easy way to do this?
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0answers
18 views

Reset Python 3 Installation - ArcGIS Pro / QGIS

I am having an issue with both ArcGIS Pro and QGIS - both applications fail to consistently initialise / operate as intended when they do start up. I have recently been trying to get Python 3 to work ...
0
votes
0answers
24 views

qgs projects and qgis2web automation process [on hold]

I would like to know if it is possible to automate QGIS projects with QGIS based on telemetry data that are stored in a directory of the network through the execution of a script every night at ...