Jul 29, 2020. QGIS Plugins¶. QGIS has been designed with a plugin architecture. This allows many new features/functions to be easily added to the application. Many of the features in QGIS are actually implemented as either core or external plugins. Core Plugins are maintained by the QGIS Development Team and are automatically part of every QGIS distribution. They are written in one of two languages. I have success creating a folder within my Applications folder called something like QGIS28, as QGIS 2.8 is my currently installed version. I drag the already installed QGIS 2.8 app into that folder, then proceed with installing QGIS 2.10. I can also create an appropriately named.
This week the next stable version of QGIS was released. It is being called QGIS version 2.8 ‘Wien‘. Wien is German for ‘Vienna‘ which was the host city for the QGIS developer meetings in 2009 and 2014.
QGIS 2.8 Splash Page
Recently a new version of QGIS has been released every four months. This rapid pace of development has its pros and cons. On the plus side, the software is rapidly growing and improving. On the con side it has made it difficult to maintain documentation. It has also been an issue for people working on large projects. They have had to deal with the software changing every four months.
QGIS 2.8 is a special release because it is the first in a series of long-term releases (LTR’s). The idea is that one release per year will be an LTR. This means that the LTR release will be supported and available for download for one year. This way people needing stability can use this until the next LTR is released a year from now.
Some of the highlights are:
The detailed list of new features can be found in the QGIS Virtual Change log: http://www2.qgis.org/en/site/forusers/visualchangelog28/index.html
Visit the download page and take the new version for a spin. Remember you can install it on Windows, Mac and Linux!
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This chapter gives a quick overview of installing QGIS, some sample data fromthe QGIS web page, and running a first and simple session visualizing rasterand vector layers.
Installation¶
Installation of QGIS is very simple. Standard installer packages are availablefor MS Windows and Mac OS X. For many flavors of GNU/Linux, binary packages (rpmand deb) or software repositories are provided to add to your installation manager. Get the latest information on binary packages at the QGIS website athttp://download.qgis.org.
Installation from source¶
If you need to build QGIS from source, please refer to the installationinstructions. They are distributed with the QGIS source code in a filecalled INSTALL. You can also find them online athttp://htmlpreview.github.io/?https://raw.github.com/qgis/QGIS/master/doc/INSTALL.html
Installation on external media¶
QGIS allows you to define a --configpath option that overrides the default path for user configuration (e.g., ~/.qgis2 under Linux) and forcesQSettings to use this directory, too. This allows you to, for instance, carry aQGIS installation on a flash drive together with all plugins and settings. See section System Menu for additional information.
Sample Data¶
The user guide contains examples based on the QGIS sample dataset.
The Windows installer has an option to download the QGIS sample dataset.If checked, the data will be downloaded to your MyDocuments folder andplaced in a folder called GISDatabase. You may use Windows Explorer tomove this folder to any convenient location. If you did not select the checkboxto install the sample dataset during the initial QGIS installation, you may do one of the following:
For GNU/Linux and Mac OS X, there are not yet dataset installationpackages available as rpm, deb or dmg. To use the sample dataset, download thefile qgis_sample_data as a ZIP archive fromhttp://qgis.org/downloads/data and unzip the archiveon your system.
The Alaska dataset includes all GIS data that are used for examples andscreenshots in the user guide; it also includes a small GRASS database.The projection for the QGIS sample dataset is Alaska Albers Equal Area withunits feet. The EPSG code is 2964.
If you intend to use QGIS as a graphical front end for GRASS, you can find aselection of sample locations (e.g., Spearfish or South Dakota) at theofficial GRASS GIS website, http://grass.osgeo.org/download/sample-data/.
Sample Session¶
Now that you have QGIS installed and a sample dataset available, we wouldlike to demonstrate a short and simple QGIS sample session. We will visualizea raster and a vector layer. We will use the landcover raster layer,qgis_sample_data/raster/landcover.img, and the lakes vectorlayer, qgis_sample_data/gml/lakes.gml.
Start QGIS¶
Load raster and vector layers from the sample dataset¶
You can see how easy it is to visualize raster and vector layers in QGIS. Let’smove on to the sections that follow to learn more about the availablefunctionality, features and settings, and how to use them.
Starting and Stopping QGIS¶
In section Sample Session you already learned how to start QGIS. We willrepeat this here, and you will see that QGIS also provides further command lineoptions.
To stop QGIS, click the menu option FileQGIS ‣ Quit, or use the shortcut Ctrl+Q.
Command Line Options¶
QGIS supports a number of options when started from the command line. Toget a list of the options, enter qgis--help on the command line. The usagestatement for QGIS is:
Tip
Example Using command line arguments Steel guitar vst download.
You can start QGIS by specifying one or more data files on the commandline. For example, assuming you are in the qgis_sample_datadirectory, you could start QGIS with a vector layer and a raster fileset to load on startup using the following command:qgis./raster/landcover.img./gml/lakes.gml
Command line option--snapshot
This option allows you to create a snapshot in PNG format from the current view.This comes in handy when you have a lot of projects and want to generatesnapshots from your data.
Currently, it generates a PNG file with 800x600 pixels. This can be adjustedusing the --width and --height command line arguments. A filename canbe added after --snapshot.
Command line option--lang
Based on your locale, QGIS selects the correct localization. If you would liketo change your language, you can specify a language code. For example,--lang=it starts QGIS in italian localization.
Command line option--project
Starting QGIS with an existing project file is also possible. Adobe acrobat 11 download mac. Just add thecommand line option --project followed by your project name and QGIS willopen with all layers in the given file loaded.
Illustrator cs6 mac free download. Command line option--extent
To start with a specific map extent use this option. You need to add thebounding box of your extent in the following order separated by a comma:
Command line option--nologo
This command line argument hides the splash screen when you start QGIS.
Command line option--noplugins
If you have trouble at start-up with plugins, you can avoid loading them atstart-up with this option. They will still be available from the Plugins Manager afterwards.
Command line option--customizationfile
Using this command line argument, you can define a GUI customization file, that willbe used at startup.
Command line option--nocustomization
Using this command line argument, existing GUI customization will not be appliedat startup.
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Command line option--optionspath
You can have multiple configurations and decide which one to use when startingQGIS with this option. See Options to confirm where theoperating system saves the settings files. Presently, there is no way to specifya file to write settings to; therefore, you can create a copy ofthe original settings file and rename it. The option specifies path to directorywith settings. For example, to use /path/to/config/QGIS/QGIS2.ini settings file,use option:
Command line option--configpath
This option is similar to the one above, but furthermore overrides the defaultpath for user configuration (~/.qgis2) and forces QSettings to usethis directory, too. This allows users to, for instance, carry a QGIS installation on aflash drive together with all plugins and settings.
Command line option--code
This option can be used to run a given python file directly after QGIS has started.
For example, when you have a python file named load_alaska.py with following content:
Assuming you are in the directory where the file load_alaska.py is located, youcan start QGIS, load the raster file landcover.img and give the layer the name‘Alaska’ using the following command:qgis--codeload_alaska.py
Qgis 2.14 DownloadProjects¶
The state of your QGIS session is considered a project. QGIS works on oneproject at a time. Settings are considered as being either per-project or as adefault for new projects (see section Options). QGIS can save thestate of your workspace into a project file using the menu optionsProject ‣Saveor Project ‣Save As...
Load saved projects into a QGIS session using Project ‣Open..,Project ‣ New from template orProject ‣ Open Recent ‣.
If you wish to clear your session and start fresh, chooseProject ‣New.Either of these menu options will prompt you to save the existing project ifchanges have been made since it was opened or last saved.
The kinds of information saved in a project file include:
Qgis 2.8.3
The project file is saved in XML format, so it is possible to edit the fileoutside QGIS if you know what you are doing. The file format has been updated severaltimes compared with earlier QGIS versions. Project files from older QGIS versionsmay not work properly anymore. To be made aware of this, in theGeneral tab under Settings ‣ Options you canselect:
https://2007-Gmc-Denali-Repair-Manual-Download.peatix.com/. Whenever you save a project in QGIS a backup of the project file is made with the extension ~.
Output¶Qgis 2 Download
There are several ways to generate output from your QGIS session. We havediscussed one already in section Projects, saving as a project file.Here is a sampling of other ways to produce output files:
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