[Qgis-user] QGIS action to run a command in a terminal window on Windows

pal Technician, Fisheries NIWA DDI: +64 (4) 3860529 From: QGIS-User on behalf of Brent Wood via QGIS-User Sent: Wednesday, March 6, 2024 09:33 To: 'Qgis-user@lists.osgeo.org' Cc: Nyall Dawson Subject: [Qgis-user] Problem: Can't open Spatialite tables in

Re: [Qgis-user] Model Designer - GDAL - Vector Conversion

Have you considered a script or batch file using ogr2ogr to do this for you? Brent Wood Principal Technician, Fisheries NIWA DDI: +64 (4) 3860529 From: Qgis-user on behalf of Johanna Botman via Qgis-user Sent: Wednesday, March 9, 2022 12:41 To: qgis-user@lists

Re: [Qgis-user] RAM and processing speed requirements for QGIS

Hi Helena, My 02c - it totally depends... QGIS as an application does not require much memory or cpu, until you throw data at it and ask it to do something. Your data and tasks determine the requirements, not the bare application. I did some benchmarking a while ago - R requires up to 8x the m

Re: [Qgis-user] Polar stereographic (0 - 360 longitudes)

I don't believe you can. The underlying proj libraries (as used by QGIS) no longer support longitudes > 180 by default, so any re-projection from EPSG:4326 will only work with +-180 longitudes. There isa command line parameter (+over) which can be used with proj on the command line but I don't

[Qgis-user] Replay GPS data

Hi, I have a log file of GPS NMEA messages captured during a survey. I'm working with QGIS for real time data capture during these surveys. For demo/training/dev purposes I'd like to pass the file of GPS messages into QGIS via teh GPS panel to simulate the real world survey. Any suggestions as

Re: [Qgis-user] [QGIS-Developer] Model for Temporal Measurement (vector) Datasets ?

Hi Richard, I think the underlying issue here is that QGIS does not do data management... It just accesses data (whether not managed, managed or mismanaged). You are correct, the traditional GIS model of a feature with attributes does not map to the real world very well in many use cases, and t

Re: [Qgis-user] Watershed - Catchment area upstream of a point

Hi Tony, Just wondering If QGIS is using SAGA to do the work, have you considered installing SAGA & using it directly? Brent Wood Principal Technician, Fisheries NIWA DDI: +64 (4) 3860529 From: Qgis-user on behalf of Tony Shepherd (FarmMaps NZ) via Qgis-

[Qgis-user] Proj DB version conflict

Hi, I have a problem working with QGIS, Spatialite, R (sf package), and Postgis on Linux (Mint/Ubuntu) I cannot find versions of these applications that all share a common version of proj.db, and I cannot find a way to have a separate proj.db for each application. Any suggestions? Thanks

Re: [Qgis-user] The license agreement of QGIS

The full licence is described here: https://docs.qgis.org/3.22/en/docs/user_manual/appendices/GNU_GPL.html Essentially it means you can install and use QGIS anywhere you want for whatever the cost of downloading it might be (usually free). You can be an individual, government agency, commercial

[Qgis-user] QGIS & GPS

Gidday and Happy New Year from New Zealand! I have spent too many hours on this already, sigh... Hopefully someone can help. I normally use QGIS with USB GPS units on Linux and don't have driver issues, everything just works. But I now need to re-introduce myself to QGIS on Windows to set thing

Re: [Qgis-user] transferring data from ArcGis to QGIS

Hi Janet, See https://north-road.com/slyr/ There is a free community version and a commercial one if you need the extra functionality. Brent Wood Principal Technician, Fisheries NIWA DDI: +64 (4) 3860529 From: QGIS-User on behalf of Janet via QGIS-User

[Qgis-user] Post Cyclone Gabrielle aerial imagery for Hawkes Bay, New Zealand

This might interest QGIS-ers... The LINZ (Land Information New Zealand) Data plugin ( allows users to connect to the LINZ Data Service WMTS services. (https://www.linz.govt.nz/guidance/data-service/using-linz-data-importer-plugin-qgis, https://plugins.qgis.org/plugins/linz-data-importer/) Since

Re: [Qgis-user] How can I center a world map cylindric projection over the Pacific Ocean?

Create a custom projection (CRS) with the parameters you want. >From the main menu Settings -> Custom projections Find one that is close to what you want, paste it here & edit to your preferences Brent Wood Principal Technician, Fisheries NIWA DDI: +64 (4) 3860529 _

[Qgis-user] Null value issue in attribute form

Hi, I have a database table which has an attribute form built for data entry, in QGIS 3.34. There is a text field "station_code" It is set to not null & enforce not null in the form. If the default value is null (empty) the form includes the default text 'NULL'. Any text entered in the form is

[Qgis-user] QGIS attribute forms question

Hi, I have created some forms for data entry/edit using QGIS. I have successfully exported them & imported them to apply in different computers with QGIS. It can take several hours to create such a form where there are 80+ columns in the underlying database table, I now have the situation whe

[Qgis-user] QGIS/spatialite issue - invalid layers

Hi, I have created an empty spatialite database with QGIS via the browser. Running Mint Linux with QGIS: 3.34.1-Prizren QGIS code revision 133927424d9 I create a spatialite table (in spatialite) & add some point data (EPSG 4326 - column is c

[Qgis-user] QGIS unable to access Spatialite tables.

Hi, I and a few colleagues are encountering a problem accessing Spatialite tables from QGIS. It does not seem to be happening with v3.28, but it is with v3.34 (in both Linux & Windows). When opening a table in v2.8 there are no issues, everything is working as it has in recent years. However,

[Qgis-user] Problem: Can't open Spatialite tables in QGIS on Windows

Hi, We have been using QGIS & Spatialite for years and have recently encountered a problem in QGIS under Windows. We connect to a spatialite database fine, we can list the tables, but when we try to open them we get an error: db <...> table <...> is an invalid layer - not loaded (this is also w

Re: [Qgis-user] Adding a Web map to QGIS

Hi Krishna, Can you not ask them to turn on the WFS service in their ARC setup? Unless, like many govt agencies, they just ignore users requests. Sigh. Another option is to look for the data you want in data.gov. I have found that govt agencies often have strange & limited access to their data

[Qgis-user] Adding virtual X & Y columns to a QGIS attribute form

Hi, I have created an attribute form for a QGIS layer. I want to add two fields to the form: the X & Y values of a point geometry column. I can't find any way to do this - if I don't use the form, it is easy to add the virtual columns as expressions ($x & $y) in the table view, but I want the

Re: [Qgis-user] USGS 3DEM question: export to kml/kmz

One comment - have the LIDAR set to hillshade in grayscale (set symbology to hillshade) with the imagery overlayed & symbology partially transparent (or partially opaque). You can adjust the opacity to what looks good & you don't need to switch between them - you can see them both at once. You

Re: [Qgis-user] Plugin for Fiber Cable Network Planning

Hi Krishna, I'm not aware of any specific QGIS plugins supporting this, but if you search Youtube for "QGIS network planning" there are few videos there that you may find useful. Cheers, Brent Wood On Tue, 11 Feb 2025 at 05:54, krishna Ayyala via QGIS-User mailto:qgis-user@lists.osgeo.or

Re: [Qgis-user] Help opening a Spatialite view in QGIS

bject: RE: Help opening a Spatialite view in QGIS Hi Brent, I’ve often found that the problem with views has come from the id column. Does the integer “station_no” column have a unique constraint? It may need one. I put some notes on Spatialite views in this Stack Exchange answer a few year

[Qgis-user] Help opening a Spatialite view in QGIS

Hi, I have created a view in a spatialite database, but am unable to open it in QGIS. I can't find any documentation on how this works. I have a table "stations" which contains a station_no column (integer) and a point geometry column (startp, EPSG 4326). The view is created by: create view v

Re: [Qgis-user] Recommended specification for Windows 11

There is no set requirement, as hardware requirements vary depending largely on the data volumes you are rendering/processing. More is always better, Windows generally requires more than Mac & Linux. A graphics processor with its own memory will help improve performance, but is not required. I

Re: [Qgis-user] question

Hi, Off the top of my head... Postgis can easily cope with millions of records. Given the points are there, use that to create the hexagons as required - this can be done using https://postgis.net/docs/ST_HexagonGrid.html If you set up your QGIS project with preset zoom levels, and create a se

Re: [Qgis-user] question

Postgis generated hexagons are NOT H3 hexagons - unless you very carefully generate them to fit. Use the Postgres h3 extension for h3 hexagon support: https://blog.rustprooflabs.com/2022/04/postgis-h3-intro Brent Wood Principal Technician, Fisheries NIWA DDI: +64 (4) 3860529 _

Re: [Qgis-user] question

That is php code. if that is what you want, but I don't do php. SQL function: ST_HexagonGrid(float8 size , geometry bounds ); This will create a set of hexagons according to the parameters you pass: size - the length of one side of the hexagon geometry - a Postgis geometry used to determine the e

Re: [Qgis-user] Drawing circles on maps at 600 ft diameters out to 3000 feet from a specific point

Hi, The short answer is yes, QGIS can do that sort of stuff, but I'd use a different workflow which I think is easier. If you have a spatially enabled database (Postgis, Spatialite, MySQL, MariaDB, etc), I'd do it there. Spatialite is probably the best to start with if you have not used one be

Re: [Qgis-user] Colourising contour lines

Hi Grant, I'm not sure I understand your question, or at least the context in detail. This depends on how the grid colours are defined in QGIS. If the grid is of elevation data, pixel values are elevations (heights/depths) then to get colours applied you must be applying a colour map to the gr