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QGIS is a full-featured, user-friendly, free-and-open-source (FOSS) geographical information system (GIS) that runs on Unix platforms, Windows, and MacOS.
<!-- TOC generated with https://freelance-tech-writer.github.io/table-of-contents-generator/index.html -->
- [Features](#features)
- [1. Flexible and powerful spatial data management](#1-flexible-and-powerful-spatial-data-management)
- [2. Beautiful cartography](#2-beautiful-cartography)
- [3. Advanced and robust geospatial analysis](#3-advanced-and-robust-geospatial-analysis)
- [4. Powerful customization and extensibility](#4-powerful-customization-and-extensibility)
- [5. QGIS Server](#5-qgis-server)
- [Under the hood](#under-the-hood)
- [Versions and release cycle](#versions-and-release-cycle)
- [Free and Open Source](#free-and-open-source)
- [Installing and using QGIS](#installing-and-using-qgis)
- [Documentation](#documentation)
- [Help and support channels](#help-and-support-channels)
- [Get involved with the community](#get-involved-with-the-community)
- [Bug reporting and bug fixing](#bug-reporting-and-bug-fixing)
- [New features and enhancements](#new-features-and-enhancements)
- [Translations](#translations)
- [Other ways to contribute](#other-ways-to-contribute)
## Features
### 1. Flexible and powerful spatial data management
- Support for raster, vector, mesh, and point cloud data in a range of industry-standard formats
- *Raster formats include*: GeoPackage, GeoTIFF, GRASS, ArcInfo binary and ASCII grids, ERDAS Imagine SDTS, WMS, WCS, PostgreSQL/PostGIS, and [other GDAL supported formats](https://gdal.org/drivers/raster/index.html).
- *Vector formats include*: GeoPackage, ESRI shapefiles, GRASS, SpatiaLite, PostgreSQL/PostGIS, MSSQL, Oracle, WFS, Vector Tiles and [other OGR supported formats](http://www.gdal.org/ogr_formats.html).
- *Mesh formats include*: NetCDF, GRIB, 2DM, and [other MDAL supported formats](https://github.com/lutraconsulting/MDAL#supported-formats).
- *Point-cloud format*: LAS/LAZ and EPT datasets.
- Data abstraction framework, with local files, spatial databases (PostGIS, SpatiaLite, SQL Server, Oracle, SAP HANA), and web services (WMS, WCS, WFS, ArcGIS REST) all accessed through a unified data model and browser interface, and as flexible layers in user-created projects
- Spatial data creation via visual and numerical digitizing and editing, as well as georeferencing of raster and vector data
- On-the-fly reprojection between coordinate reference systems (CRS)
- Nominatim (OpenStreetMap) geocoder access
- Temporal support
*Example: Temporal animation*
*Example: 3D map view*
### 2. Beautiful cartography
- Large variety of rendering options in 2D and 3D
- Fine control over symbology, labeling, legends and additional graphical elements for beautifully rendered maps
- Respect for embedded styling in many spatial data sources (e.g. KML and TAB files, Mapbox-GL styled vector tiles)
- In particular, near-complete replication (and significant extension) of symbology options that are available in proprietary software by ESRI
- Advanced styling using data-defined overrides, blending modes, and draw effects
- 500+ built-in color ramps (cpt-city, ColorBrewer, etc.)
- Create and update maps with specified scale, extent, style, and decorations via saved layouts
- Generate multiple maps (and reports) automatically using QGIS Atlas and QGIS Reports
- Display and export elevation profile plots with flexible symbology
- Flexible output direct to printer, or as image (raster), PDF, or SVG for further customization
- On-the-fly rendering enhancements using geometry generators (e.g. create and style new geometries from existing features)
- Preview modes for inclusive map making (e.g. monochrome, color blindness)
*[Example: Map of Bogota, Colombia in the style of Starry Starry Night, by Andr茅s Felipe Lancheros S谩nchez](https://flic.kr/p/2jFfGJP)*
For more maps created with QGIS, visit the [QGIS Map Showcase Flickr Group](https://www.flickr.com/groups/2244553@N22/pool/with/50355460063/).
### 3. Advanced and robust geospatial analysis
- Powerful processing framework with 200+ native processing algorithms
- Access to 1000+ processing algorithms via providers such as GDAL, SAGA, GRASS, OrfeoToolbox, as well as custom models and processing scripts
- Geospatial database engine (filters, joins, relations, forms, etc.), as close to datasource- and format-independent as possible
- Immediate visualization of geospatial query and geoprocessing results
- Model designer and batch processing
*Example: Travel isochrones*
*Example: Model designer*
### 4. Powerful customization and extensibility
- Fully customizable user experience, including user interface and application settings that cater to power-users and beginners alike
- Rich [expression engine](https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/expression.html) for maximum flexibility in visualization and processing
- Broad and varied [plugin ecosystem](https://plugins.qgis.org/) that includes data connectors, digitizing aids, advanced analysis and charting tools,
in-the-field data capture, conversion of ESRI style files, etc.
- Style manager for creating, storing, and managing styles
- [QGIS style hub](https://plugins.qgis.org/styles/) for easy sharing of styles
- Python and C++ API for standalone (headless) applications as well as in-application comprehensive scripting (PyQGIS)
*Example: Style manager*
*Example: Plugins*
<!-- Kill this one for now, since the example provided is Python2 not 3
Example: Python console
-->
### 5. QGIS Server
Headless map server -- running on Linux, macOS, Windows, or in a docker container -- that shares the same code base as QGIS.
- Industry-standard protocols (WMS, WFS, WFS3/OGC API for Features and WCS) allow plug-n-play with any software stack
- Works with any web server (Apache, nginx, etc) or standalone
- All beautiful QGIS cartography is supported with best-in-class support for printing
- Fully customizable with Python scripting support
*Example: QGIS server WMS response*
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QGIS最新源码#C++#QT#Liunx （2000个子文件） 
qgisapp.cpp 646KB qgslayoutdesignerdialog.cpp 177KB qgsdualedgetriangulation.cpp 133KB qgsoptions.cpp 128KB qgsprojectproperties.cpp 122KB qgsinbuiltdataitemproviders.cpp 113KB qgsvertextool.cpp 110KB qgsdwgimporter.cpp 102KB qgsmaptooleditmeshframe.cpp 97KB qgsidentifyresultsdialog.cpp 92KB qgsgeorefmainwindow.cpp 88KB qgspluginmanager.cpp 70KB qgsalgorithmexportmesh.cpp 67KB qgsapplayerhandling.cpp 66KB main.cpp 65KB qgsgrassmapcalc.cpp 60KB qgsapplayertreeviewmenuprovider.cpp 57KB qgsmaptoollabel.cpp 52KB qgs3daxis.cpp 49KB qgsattributetabledialog.cpp 45KB qgs3dmapscene.cpp 45KB qgsalgorithmrandomraster.cpp 44KB qgselevationprofilewidget.cpp 43KB qgsshadowrenderingframegraph.cpp 43KB qgsappbrowserproviders.cpp 43KB qgsgrassmoduleparam.cpp 42KB topolTest.cpp 40KB qgs3dmapsettings.cpp 40KB CloughTocherInterpolator.cpp 39KB qgsalgorithmcellstatistics.cpp 38KB qgsgrassmoduleinput.cpp 38KB qgspointcloud3dsymbol_p.cpp 37KB qgsmaptoolmovelabel.cpp 36KB qgsgrassnewmapset.cpp 35KB qgscustomization.cpp 35KB qgisappinterface.cpp 35KB qgscameracontroller.cpp 34KB qgsalgorithmfuzzifyraster.cpp 34KB qgsalgorithmgpsbabeltools.cpp 33KB qgssnappingwidget.cpp 33KB qgslayerstylingwidget.cpp 33KB qgsgeometrycheckfactory.cpp 32KB qgslabelpropertydialog.cpp 32KB qgs3dsceneexporter.cpp 32KB qgsgrassplugin.cpp 31KB qgs3dutils.cpp 31KB qgsmeasuredialog.cpp 31KB qgsmaptoolselectutils.cpp 31KB qgsgrassmoduleoptions.cpp 29KB MathUtils.cpp 29KB qgspointcloud3dsymbolwidget.cpp 29KB qgsgrassmodule.cpp 29KB qgsalgorithmextractlabels.cpp 29KB qgsmergeattributesdialog.cpp 27KB qgsrastercalculator.cpp 27KB qgsgeometrycheckerresulttab.cpp 26KB qgs3dmapcanvaswidget.cpp 26KB qgsnativealgorithms.cpp 25KB qgs3dmapconfigwidget.cpp 25KB qgsmaptooloffsetcurve.cpp 25KB qgsdwgimportdialog.cpp 25KB qgspoint3dsymbol_p.cpp 25KB qgshandlebadlayers.cpp 25KB qgssnappinglayertreemodel.cpp 25KB qgspluginregistry.cpp 24KB qgsquickelevationprofilecanvas.cpp 24KB qgsrelief.cpp 24KB qgsstatisticalsummarydockwidget.cpp 24KB qgschunkedentity_p.cpp 24KB qgsdecorationgrid.cpp 24KB qgsgeometrysnapper.cpp 23KB qgsalgorithmjoinbylocation.cpp 23KB qgsmeshcalculatordialog.cpp 23KB qgsmapsavedialog.cpp 22KB qgsmapcanvasdockwidget.cpp 22KB qgsdxfexportdialog.cpp 22KB qgsalgorithmextractbylocation.cpp 21KB qgsalgorithmxyztiles.cpp 21KB qgspointcloud3dsymbol.cpp 21KB qgsrulebased3drendererwidget.cpp 21KB qgsgpsinformationwidget.cpp 21KB qgsgpstoolbar.cpp 21KB qgsrasteranalysisutils.cpp 21KB qgsalgorithmjoinbylocationsummary.cpp 21KB qgsalgorithmpackage.cpp 21KB qgsgeometrycheckersetuptab.cpp 20KB qgsalgorithmrandompointsinpolygons.cpp 20KB qgsgpsoptions.cpp 20KB qgsgrasstools.cpp 20KB qgswelcomepage.cpp 20KB qgsgltf3dutils.cpp 20KB qgsalgorithmdetectdatasetchanges.cpp 20KB qgsalgorithmgrid.cpp 19KB qgsalignraster.cpp 19KB qgsvectorelevationpropertieswidget.cpp 19KB qgsgeometrygapcheck.cpp 19KB qgsgeometryvalidationservice.cpp 19KB qgsappcoordinateoperationhandlers.cpp 19KB qgsalgorithmrandompointsonlines.cpp 19KB qgsrastercalcdialog.cpp 19KB共 2000 条
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