Questions tagged [qgis]

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

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36 views

Forum moderation [closed]

New on this forum and suprised to see that some users spend there time to add or remove spaces in the message posted by other users. A job that is similar to the GAFAMs content moderators, unhappy ...
2
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1answer
33 views

Getting unique values in a QGIS Expression

I'm using QGIS 3.4 attribute form to edit the widget type. I'm trying to retrieve "cab_no." field values (only unique values) from 'U_Cabinet' layer to use it in "fdt#" field in ...
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1answer
18 views

Making colours from table with colour percentages/RGB-codes

Currently, we have a big dataset imported in our QGIS profile. Normally we would have imported this by WMS but because this particular WMS/WFS consists of more than 20 parts and the data is ...
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18 views

QGIS how to batch process zonal statistics?

I'm trying to figure out how to run "zonal statistics" in QGIS 3.8.2 (qgis:zonalstatistics) on multiple hundred shapefiless with building footprints and corresponding raster files (each ...
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22 views

How to convert rainfall time series to raster?

I have a rainfall time series for 10 hours in increments of 0.250s, I need to convert it from a .txt-file to a raster. I've tried using r.mapcalc in GRASS, however, have not been successful. I've also ...
1
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1answer
16 views

Linear referencing using virtual layers in QGIS

I am trying to replicate the behaviour explained on this page. There are two initial layers : One network layer (line geometry), called base_lines (fields : LB_idRiver) One event layer (non-...
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30 views

Buffer around suburb lines

I am using QGIS 3.6.3 and I am an amateur QGIS user. My QGIS project currently has a map outlining suburb boundaries in New South Wales, Australia. I am wondering if I can create a buffer around ...
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0answers
35 views

Apply a date filter to the vector layer

I am new to developement in QGIS. I use a the 3.4.4 version of QGIS. My vector layer is like this: So I want to know how to filter this data by date and apply the changes in the GUI. Here is what I ...
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2answers
28 views

QField use main-detail tables from PostGIS/PostgreSQL

We are using QField for field data collection (forest survey). Our data is stored in a PostGIS/PostgreSQL database and we use QFieldSync to export and import data. This works fine as long, as we use ...
0
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1answer
39 views

How to fix the label position after using automated placement in QGIS

I'm making a city map using QGIS 3.14 and I want to label every street (that's around 5000 label, the map is an A0 size at 1/12 000 scale). There are no other label than the street name and all label ...
1
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1answer
36 views

Shapefile not displaying correctly

I'm very new to QGIS, but have used Arc a bit. I've downloaded a shapefile of the Home Owners' Loan Corporation "residential security maps" from the 20th century (i.e. redlining maps). I ...
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18 views

Standalone scripting and temporal controller

I have a couple of slightly related questions arising from my efforts at producing a collection of PDF maps from a collection of temporal GIS data. One key thing I am dealing with is that I my data ...
2
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1answer
18 views

QGIS buffer of lines results in “random” vertex order in buffer polygon

I tried this topic already on QGIS dev mailing list: I have a fairly complex geometry-(and mind-)bending workflow where I'd ideally depend on the fact that buffering a line (regular buffer, flat cap, ...
2
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1answer
40 views

Managing large numbers of raster DEMs for QGIS

I have a large number of (say 9000) 2km x 2km raster DEMs in ASC file format that I am trying to manage, in order to use in QGIS. I've been looking for way of storing them, ideally on the filesystem, ...
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0answers
11 views

Manually scale polygon feature in QGIS

I want to manually scale selected polygon feature in QGIS so I don't need to set any parameters, just click on the feature and scale it moving the mouse. In ArcGIS there is a Scale tool. I want the ...
2
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1answer
36 views

Bulk adding custom CRS in QGIS

I have a list of more than one hundred CRS defenitions in PROJ4 format in a plain text file (csv, tsv or txt). I'd like to know if there is any way of adding them into QGIS database at once. The "...
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0answers
21 views

Imported DXF has no position attribute using QGIS

I am using QGIS 3.10.8 and still getting my head around QGIS. I'm trying to import some route data from dxf into my QGIS project. when I import and set the CRS correctly it is in the correct place, ...
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0answers
12 views

Combining different svg fill symbols in QGIS without overlapping

Is it possible to get a polygon filled with a couple of different SVG fills without overlapping? I want them to go side by side forming a mosaic, instead of overlapping each other, but can't find how (...
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0answers
8 views

Restrict Layer Style getting saved in QGIS project table in PostgreSQL

As postgres admin , I have created a layer and styled the same in QGIS AND saved the style in postgres. When another user uses the same project(user have been given the grant to access the project) ...
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0answers
34 views

QGIS: Buffer area issue [duplicate]

I'm new in QGIS and I try to properly generate a buffer layer. My config is: -Debian buster (10) -QGIS v2.18 -The numeric separator on my machine is coma not dot. I created a project with the ...
0
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1answer
19 views

Entering UTM Map Coordinates when georeferencing is not working

I'm trying to enter UTM map coordinates from a scanned image (grid), and I'm entering the coordinates correctly X/Y, but when I click to process the georeferencing - the image does not overlay where ...
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0answers
20 views

QFieldSync plugin reports “No space left on device” during packaging

I am trying to configure a QGIS project using QFieldSync plugin but it keeps giving me Python error when I try to package the project for QField Traceback (most recent call last): File &...
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0answers
17 views

How to “merge” multiple raster ASTER L1T bands?

I want to generate a Land Surface Temperature map using ASTER products. I used the Semi-Automatic Classification plugin and followed this tutorial. However my study area is too large and required at ...
1
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0answers
26 views

QGIS: Dissolving stacked polygons into non-overlapping “donut” features

I am trying to get my head around what I think is a fairly straight forward geoprocessing problem: I have created a polygon contour layer. However the polygon features are stacked on top of each other ...
0
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1answer
22 views

Missing / misnamed fields in PostgreSQL table join in QGIS

First, I'm brand new to PostgreSQL and PostGIS, so my question is probably asked wrong, and it may be a duplicate – but my search attempts didn't find anything. Also, I don't expect this is an issue ...
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0answers
16 views

Local Package Directory QGIS 3.10.1 through to .8 [closed]

I have been asking QGIS support finally giving up with them to inform me how to change the default Local Package Path in Windows . I reported to QGIS that their current use of Windows /Users /local /...
2
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0answers
26 views

How to select one field and delete all others QGIS graphical modeler

In the Graphical Modeler in QGIS I have the algorithm to Drop Fields, which you select the fields you want to drop: However, the vector layer I'm using has many fields but I just need one in the end. ...
0
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0answers
15 views

QGIS Action Open Image

Can someone advise me where i might be going wrong when trying to open an Image in a Network folder using the Action function in QGIS I have a point dataset with a column that has the image location ...
2
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1answer
28 views

Using Split vector Layer in QGIS

I am trying to split a vector file using an attribute value and wants to name the each created output as the name in the attribute field. I am being able to split the vector layer but it is giving ...
1
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1answer
34 views

Imported polygon from Google Earth is not being merged

I'm new to QGIS. I need to merge two polygon that I have imported from Google Earth (.kml) but when I try to do so I am getting an error message Not enough features selected: The merge tool requires ...
1
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1answer
53 views

Coordinate Transformation Difference between QGIS and Proj

I transformed coordinates on PyQgis and Proj command line and there is 3.8 meters difference between the transformations. I used the same EPSG codes. For Proj 6.3: echo 35.53 38.75 | cs2cs +init=epsg:...
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0answers
20 views

Raster Resampling / Clipping? QGIS

When I am trying to resample a raster layer or to clip it by mask layer the pixel value get automatically changed in the output file irrespective of every setting. Why it is happening and how can i ...
0
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1answer
50 views

Change center of projection (QGIS) [closed]

I'm working with this mosaic from Pluto. It is projected in simple cylindrical. I need help to change, using PyQGIS, the center of the projection to the coordinates of a specific point, or to a ...
0
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0answers
8 views

UMEP Copernicus downloader ERA5 throwing Python Error

I am very new to using UMEP and I have installed it on QGIS 3.10 on MacOS and also on Windows but in both machines, I am running into the following error. I have set up my id/key API properly as I can ...
0
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0answers
23 views

How to run an exported QGIS program as a stand-alone application?

I have a research partner who exported their QGIS algorithm to a python script, and my job is to use that Python file to create a web application that provides access to that algorithm. My eventual ...
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0answers
24 views

Converting 2D into 3D in QGIS [closed]

I want to ask if somebody can tell me the options how to convert 2D into 3D in QGIS... For example I already know that there is the option of extrusion... Are there any other options?
2
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2answers
35 views

QGIS expression to check if a an attribute value of a feature exist in another attribute column

I have a shapefile with two fields 'Name' and 'CountyFacilityID'. I would like to create an expression to select all features where Name exists in the CountyFacilityID column for any of the features. ...
0
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0answers
15 views

QGIS: Merging many vector layers of the same name together

This topic has some relation to my other topic here: Extracting catalog consiting of name of layerdata/tabel of bunch of different geopackages Because it is kind of a sequel to this one and you guys ...
1
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1answer
25 views

QGIS: Change attribute values from NULL to 0 for all attributes using Python [closed]

I have an attribute table where I have occurrences of NULL spread throughout in different attributes and features. How can I change NULL to 0 using Python for all attributes?
0
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1answer
23 views

Convert a WFS GET request to a WFS POST request [duplicate]

I have a WFS GET Request, created by A WFS Layer in QGIS. However, for my program I need to have a POST Request. How do I convert the WFS GET request to a WFS POST request?
2
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1answer
31 views

QGIS 3.10 (and newer). Random points inside polygon (Variable) tool is missing?

Using the current long term release version of QGIS (v3.10), I see the 'Random Points Inside Polygons (variable)' tool is changed. It used to look like this. The key field here is the 'number field'. ...
1
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1answer
47 views

How to merge several shapefiles with the same geometries and same attribute names?

I have data from several runs of a numerical modeling tool. The data always has the same structure - e.g. fixed set of rectangular vector tiles - no matter if there is a "valid" output or ...
4
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2answers
57 views

How to insert missing vertex of two geometry overlaps area in QGIS

I need to add the missing vertex of two lines intersection places using QGIS.If any default plugins or tools available for fixing missing vertex in qgis,kindly suggest me. My Inputs: In above ...
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0answers
17 views

Need to change center of the map [duplicate]

I have a world based map and I extract asia pacific region, now I need to make this region to be in center of the map. I using qgis. How can I make it?
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0answers
24 views

How can I create a slider map from SQL or Excel that updates every day? [closed]

I've been able to make a slider heat map that lets you slide between days. Every day I want to add a new layer (3000 values) so that tomorrow there will be 18 days/heat maps on the slider, and so on. ...
3
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1answer
89 views

QGIS not recognising field names in first row

For some reason, when I add a CSV as a delimited text layer QGIS is not recognizing field names in the first row. This has only been happening the last week or so. I am pulling my hair out. Below is a ...
0
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0answers
44 views

Importing .bag (bathymetry) files into QGIS 3.x

I downloaded bathymetric data from the NOAA Bathymetric Data Viewer website: https://maps.ngdc.noaa.gov/viewers/bathymetry/ I've tried to import and view several .bag files from this website within ...
1
vote
1answer
31 views

Missing mapsettings.ui while loading QGIS Cloud 3.1.8

I have an issue with QGIS Cloud 3.1.8. The plugin installs nicely but doesn't load due to the following error message. FileNotFoundError: [Errno 2] No such file or directory: 'C:/Users/ahmed/AppData/...
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0answers
21 views

QgsVertexMarker pyQGIS hangs QGIS 3.14 UI

I am using QgsVertexMarker API to mark the current position of the polyline that is being used to display a track. I use the setCenter API to move my marker to the current position using python. ...
1
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0answers
29 views

Show GIS data on website using automated qgis2web process [closed]

I managed to export my GIS map to my website through Qgis2Web. My map shows a daily view on a specific infestation of parasites in the poultry industry and I want this updated once a day, say at ...

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