1899f90a04
settings and logic The previous approach of a single fixed value which applied to ALL line and ALL polygon features was... not ideal. It meant that all line features would be assigned the same number of candidates, regardless of length. So a road of length 1 cm on the rendered map would have an identical number of candidates as a 30cm road covering the length of the whole map!! This resulted in both a lot of wasted calculations (generating a ridiculous number of candidates for small lines at barely discernable distances from each other) AND an insufficient number of candidates for lengthy features (resulting in worse label placement for these features). (The situation was similar, but even worse for polygons) Now, the setting is reworked to "Number of line candidates per cm" and "number of polygon candidates per cm2". This means that small features get much less candidates, and large features get much more features! Both a win for map rendering speed in many circumstances AND good cartography... now that's a nice Christmas gift for QGIS :)
About QGIS
QGIS is an Open Source Geographic Information System. The project was born in May of 2002 and was established as a project on SourceForge in June of the same year. We've worked hard to make GIS software (which is traditionally expensive commercial software) a viable prospect for anyone with basic access to a Personal Computer. QGIS currently runs on most Unix platforms (macOS/OS X included) and Windows. QGIS is developed using the Qt toolkit and C++. This means that QGIS feels snappy to use and has a pleasing, easy to use graphical user interface.
QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster , vector and mesh data formats, with new support easily added using the plugin architecture.
QGIS is released under the GNU Public License (GPL) Version 2 or above. Developing QGIS under this license means that you can (if you want to) inspect and modify the source code and guarantees that you, our happy user will always have access to a GIS program that is free of cost and can be freely modified.
Supported raster formats include:
- GRASS
- USGS DEM
- ArcInfo binary grid
- ArcInfo ASCII grid
- ERDAS Imagine
- SDTS
- GeoTiff
- Tiff with world file
- WMS, WCS
Supported vector formats include:
- ESRI Shapefiles
- PostgreSQL/PostGIS
- GRASS
- GeoPackage
- SpatiaLite
- Other OGR supported formats
- MSSQL
- Oracle
- WFS
Supported mesh formats include:
- NetCDF
- GRIB
- 2DM
- Other MDAL supported formats
Note
Please follow the installation instructions carefully.
After extracting the distribution, you can find the HTML version of the
installation document in qgis/doc/index.html. The installation document is
also available as PDF in the same directory.
Help us
Please submit bug reports using the QGIS bug tracker.
Support
You can get support in the following ways:
- Using the QGIS community site at https://qgis.org
- Joining the qgis-users mailing list
- Chatting with us real-time.
Please wait around for a response to your question as many folks
on the channel are doing other things and it may take a while for
them to notice your question.
The following paths all take you to the same chat room:
- Using an IRC client and joining the #qgis channel on irc.freenode.net.
- Using a Matrix client and joining the #qgis:matrix.org room.
- Using Gitter chat.
Contribute
QGIS is on GitHub at https://github.com/qgis/QGIS. If you wish to contribute patches you can fork the project, make your changes, commit to your repository, and then create a pull request. The development team can then review your contribution and commit it upstream as appropriate.
If you commit a new feature, add [FEATURE] to your commit message AND give a clear description of the new feature. A webhook will automatically create an issue on the QGIS-Documentation repo to tell people to write documentation about it.
If you are not a developer, there are many other possibilities which do not require programming skills to help QGIS to evolve. Check our project homepage for more information.
Building from source
The building guide can be used to get started with building QGIS from source.