Easy way to download Sentinel-2 images using QGIS SentinelHub Plugin QGIS SentinelHub plugin from Sinergise is a fantastic tool which allows us to connect to Sentinel data server, visualize, analyze and even download satellite images, all of these using only our Desktop QGIS graphic interface. May 29, 2019 Running QGIS. To run QGIS, in the terminal, activate the environment (if not activated already) and run the qgis command. Conda activate qgisstable qgis Some notes and caveats. Please be aware that QGIS packages on Conda do not provide the same level of user experience as the official Linux, Windows, and Mac packages from the QGIS.org. The reason for using SIP instead of more widely used SWIG is that the whole QGIS code depends on Qt libraries. Python bindings for Qt (PyQt) are done also using SIP and this allows seamless integration of PyQGIS with PyQt. There are several ways how to use Python bindings in QGIS desktop, they are covered in detail in the following sections.
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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¶
![How How](/uploads/1/3/3/2/133282055/706549145.png)
Best mac client for multiple messaging services. 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:
- Use GIS data that you already have
- Download sample data fromhttp://qgis.org/downloads/data/qgis_sample_data.zip
- Uninstall QGIS and reinstall with the data download option checked (only recommended ifthe above solutions are unsuccessful)
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¶
- Start QGIS by typing “QGIS” at a command prompt, or if using aprecompiled binary, by using the Applications menu.
- Start QGIS using the Start menu or desktop shortcut, or double click ona QGIS project file.
- Double click the icon in your Applications folder.
Load raster and vector layers from the sample dataset¶
- Click on the Add Raster Layer icon.
- Browse to the folder qgis_sample_data/raster/, selectthe ERDAS IMG file landcover.img and click [Open].
- If the file is not listed, check if the Files of type combo box at the bottom of the dialog is set on the righttype, in this case “Erdas Imagine Images (*.img, *.IMG)”.
- Now click on the Add Vector Layer icon.
- File should be selected as Source Typein the new Add vector layer dialog. Now click [Browse] toselect the vector layer.
- Browse to the folder qgis_sample_data/gml/, select ‘Geography MarkupLanguage [GML] [OGR] (.gml,.GML)’ from the Filter combo box, then select the GML file lakes.gml andclick [Open]. In the Add vector layer dialog, click [OK].The Coordinate Reference System Selector dialog opens with NAD27 / Alaska Alberts selected, click [OK].
- Zoom in a bit to your favorite area with some lakes.
- Double click the lakes layer in the map legend to open theProperties dialog.
- Click on the Style tab and select a blue as fill color.
- Click on the Labels tab and check the Label this layer with checkbox to enable labeling. Choose the“NAMES” field as the field containing labels.
- To improve readability of labels, you can add a white buffer around themby clicking “Buffer” in the list on the left, checking Draw text buffer and choosing 3 as buffer size.
- Click [Apply]. Check if the result looks good, and finally click [OK].
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.
- Assuming that QGIS is installed in the PATH, you can start QGISby typing qgis at a command prompt or by double clicking on the QGISapplication link (or shortcut) on the desktop or in the Applications menu.
- Start QGIS using the Start menu or desktop shortcut, or double click ona QGIS project file.
- Double click the icon in your Applications folder. If you need tostart QGIS in a shell, run/path-to-installation-executable/Contents/MacOS/Qgis.
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
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. https://diamondintensive473.weebly.com/blog/font-juventus-2013-download. For example,--lang=it starts QGIS in italian localization.
Command line option--project Download gimp software for mac.
Starting QGIS with an existing project file is also possible. Just add thecommand line option --project followed by your project name and QGIS willopen with all layers in the given file loaded.
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 What to do when mac has download error.
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 Brainworx vst free download.
Using this command line argument, existing GUI customization will not be appliedat startup.
Command line option--optionspath
You can have multiple configurations and decide which one to use when startingQGIS with this option. Konica minolta c458 mac driver download. 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:
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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:
https://shopsclever425.weebly.com/blog/mac-os-sierra-direct-download-without-app-store. 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
Projects¶
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:
![How To Download Qgis On Mac Using Anaconda How To Download Qgis On Mac Using Anaconda](/uploads/1/3/3/2/133282055/243288941.png)
- Layers added
- Which layers can be queried
- Layer properties, including symbolization and styles
- Projection for the map view
- Last viewed extent
- Print Composers
- Print Composer elements with settings
- Print Composer atlas settings
- Digitizing settings
- Table Relations
- Project Macros
- Project default styles
- Plugins settings
- QGIS Server settings from the OWS settings tab in the Project properties
- Queries stored in the DB Manager
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:
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- Prompt to save project and data source changes whenrequired
- Warn when opening a project file saved with an olderversion of QGIS
Whenever you save a project in QGIS a backup of the project file is made with the extension ~.
Output¶
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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- Menu option Project ‣Saveas Image opens a file dialog where you select the name, path and type ofimage (PNG,JPG and many other formats). A world file with extension PNGW or JPGW savedin the same folder georeferences the image.
- Menu option Project ‣DXF Export . opensa dialog where you can define the ‘Symbology mode’, the ‘Symbology scale’ andvector layers you want to export to DXF. Through the ‘Symbology mode’ symbolsfrom the original QGIS Symbology can be exported with high fidelity.
- Menu option Project ‣New Print Composer opens a dialog where you can layout andprint the current map canvas (see section Print Composer).