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|File - Download QGIS v3.12.3|
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The Leading Open Source Desktop GIS
QGIS is a user friendly Open Source Geographic Information System (GIS) licensed under the GNU General Public License. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It runs on Linux, Unix, Mac OSX, Windows and Android and supports numerous vector, raster, and database formats and functionalities.
QGIS offers many common GIS functions provided by core features and plugins. A short summary of six general categories of features and plugins is presented below, followed by first insights into the integrated Python console.
You can view combinations of vector and raster data (in 2D or 3D) in different formats and projections without conversion to an internal or common format. Supported formats include:
Spatially-enabled tables and views using PostGIS, SpatiaLite and MS SQL Spatial, Oracle Spatial, vector formats supported by the installed OGR library, including GeoPackage, ESRI Shapefile, MapInfo, SDTS, GML and many more. See section Working with Vector Data.
Raster and imagery formats supported by the installed GDAL (Geospatial Data Abstraction Library) library, such as GeoTIFF, ERDAS IMG, ArcInfo ASCII GRID, JPEG, PNG and many more. See section Working with Raster Data.
GRASS raster and vector data from GRASS databases (location/mapset). See section GRASS GIS Integration.
Online spatial data served as OGC Web Services, including WMS, WMTS, WCS, WFS, and WFS-T. See section Working with OGC Data.
Explore data and compose maps
You can compose maps and interactively explore spatial data with a friendly GUI. The many helpful tools available in the GUI include:
Data-defined feature labeling
Data-defined vector and raster symbology tools
Atlas map composition with graticule layers
North arrow, scale bar and copyright label for maps
Support for saving and restoring projects
Create, edit, manage and export data
You can create, edit, manage and export vector and raster layers in several formats. QGIS offers the following:
Digitizing tools for OGR-supported formats and GRASS vector layers
Ability to create and edit multiple file formats and GRASS vector layers
Georeferencer plugin to geocode images
GPS tools to import and export GPX format, and convert other GPS formats to GPX or down/upload directly to a GPS unit (on Linux, usb: has been added to list of GPS devices)
Support for visualizing and editing OpenStreetMap data
Ability to create spatial database tables from files with the DB Manager plugin
Improved handling of spatial database tables
Tools for managing vector attribute tables
Option to save screenshots as georeferenced images
DXF-Export tool with enhanced capabilities to export styles and plugins to perform CAD-like functions
You can perform spatial data analysis on spatial databases and other OGR-supported formats. QGIS currently offers vector analysis, sampling, geoprocessing, geometry and database management tools. You can also use the integrated GRASS tools, which include the complete GRASS functionality of more than 400 modules. (See section GRASS GIS Integration.) Or, you can work with the Processing Plugin, which provides a powerful geospatial analysis framework to call native and third-party algorithms from QGIS, such as GDAL, SAGA, GRASS and more.
Publish maps on the Internet
QGIS can be used as a WMS, WMTS, WMS-C or WFS and WFS-T client, and as a WMS, WCS or WFS server. Additionally, you can publish your data on the Internet using a webserver with UMN MapServer or GeoServer installed.
Extend QGIS functionality through plugins
QGIS can be adapted to your special needs with the extensible plugin architecture and libraries that can be used to create plugins. You can even create new applications with C++ or Python!
Core plugins include:
Coordinate Capture (capture mouse coordinates in different CRSs)
DB Manager (exchange, edit and view layers and tables from/to databases; execute SQL queries)
eVIS (visualize events)
Geometry Checker (check geometries for errors)
Georeferencer GDAL (add projection information to rasters using GDAL)
GPS Tools (load and import GPS data)
GRASS 7 (integrate GRASS GIS)
MetaSearch Catalogue Client (interacting with metadata catalog services supporting the OGC Catalog Service for the Web (CSW) standard)
Offline Editing (allow offline editing and synchronizing with databases)
Processing (the spatial data processing framework for QGIS)
Topology Checker (find topological errors in vector layers)
External Python Plugins
QGIS offers a growing number of external Python plugins that are provided by the community. These plugins reside in the official Plugins Repository and can be easily installed using the Python Plugin Installer.
For scripting, it is possible to take advantage of an integrated Python console, which can be opened with: Plugins ‣ Python Console. The console opens as a non-modal utility window. For interaction with the QGIS environment, there is the qgis.utils.iface variable, which is an instance of QgisInterface. This interface provides access to the map canvas, menus, toolbars and other parts of the QGIS application. You can create a script, then drag and drop it into the QGIS window and it will be executed automatically.
Number of open files limitation
If you are opening a large QGIS project and you are sure that all layers are valid, but some layers are flagged as bad, you are probably faced with this issue. Linux (and other OSs, likewise) has a limit of opened files by process. Resource limits are per-process and inherited. The ulimit command, which is a shell built-in, changes the limits only for the current shell process; the new limit will be inherited by any child processes.
You can see all current ulimit info by typing:
$ ulimit -aS
You can see the current allowed number of opened files per process with the following command on a console:
$ ulimit -Sn
To change the limits for an existing session, you may be able to use something like:
$ ulimit -Sn #number_of_allowed_open_files
$ ulimit -Sn
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