Get started with QGreenland Core
By completing this tutorial, the user will install QGIS, download and open the QGreenland Core data package, become familiar with the QGIS interface, and browse some data included in QGreenland.
Before downloading the QGreenland Core data package, be sure that QGIS is installed on your computer: https://www.qgis.org/en/site/forusers/download.html. QGIS is available on Windows, macOS, Linux and Android. Note that QGIS version 3.16 is the oldest version supported by QGreenland.
1) Download and Install QGIS
Go to qgis.org and download the free QGIS software, available on Windows, macOS, Linux and Android. It is recommended to download the long term release (3.16 or later) version.
2) Download and open the QGreenland Core package
Download the QGreenland Core data package (v2.0.0) at https://qgreenland.org/download.
Save the zip package to a location of your choice and unzip it. Open the
qgreenland.qgs file in the data package folder by double-clicking it. QGIS
will open automatically and display the QGreenland Core data environment.
Depending on your version of QGreenland Core, the package may be a
.qgs or a
.qgz file. They should function the same as long as you have a compatible
version of QGIS.
If QGIS is already open, one can open the
qgreenland.qgs project file
within QGIS by navigating to the “Project >Open…” option in the menu bar and
qgreenland.qgs file from its saved location.
3) Get to know the QGIS Interface
In this user guide you will see various screenshots of the QGreenland Core and QGIS interface. The screenshots in this guide were generated from QGIS version 3.16 running on a macOS Catalina operating system; thus, depending on the operating system and QGIS version you are using, your QGIS interface may look slightly different.
The main components of the QGIS interface are the Map view, Status bar, Layers panel, Toolbars, and the Menu bar.
Fig. 1: Main components of the QGIS/QGreenland interface
The Map View is the main part of the QGIS/QGreenland Core interface where the data layers are displayed. A GIS ‘layer’ refers to a geospatial dataset along with the symbols and labels used to portray it in a GIS environment.
The Status bar is the bar at the bottom of the QGIS window that shows the current coordinate reference system of the Map View, any available plugin updates, and the Map view scale. Also included in the Status bar is a quick search bar and a button to open a Log Messages window to view log messages.
The Layers Panel is where all data layers in the current project are listed. Layers can be toggled on or off, which will control whether or not they show up in the Map View. Layers are listed in the order in which they show up in the Map View - layers at the top of the list show up on top in the Map View, and vice versa. Layers can be manually moved around in the Layers Panel to change the order in which they show up. Panels and Toolbars can also be manually moved around the QGIS interface to fit the user’s preferences.
When you first open the QGreenland Core data package, two reference layers will be automatically toggled on: Greenland coastlines 2017 and the QGreenland Basemap. Layers can be rearranged by clicking and dragging up or down. Layer groups can be expanded or collapsed by clicking on the arrow to the left of the checkbox. To expand or collapse all layers at once, click on the respective buttons (Fig. 2 (a)) right above the layers list in the Layers Panel. In addition to the Layers Panel, there are a variety of other panels that can be displayed on the QGIS interface. For example, the Browser panel provides a shortcut for accessing other data layers or project files on your computer or another location. Panels can be moved around the interface by clicking and dragging, and can be removed by clicking on the ‘X’ box in the upper righthand corner.
Fig. 2: (a) Buttons above Layers Panel to expand or collapse layers; (b) hand button to grab and drag the map view; (c) magnifying glass buttons to zoom in or out in map view; (d) Zoom Full button to bring all visible layers into Map View; (d) Zoom to Layer button to bring a desired layer into view.
The Toolbars contain buttons that allow the user to interact with the Map View. For example, the hand button (Fig. 2 (b)) in the Map Navigation Toolbar lets the user grab and drag the map view around. The magnifying glass buttons (Fig. 2 (c)) allow the user to zoom in and out or to a particular feature or selection in the map view. More information about a toolbar button’s function can be obtained by hovering one’s mouse over the button. Toolbars can be moved around the QGIS workspace by clicking and dragging. To toggle a toolbar on or off, simple right click on a toolbar and check or uncheck the desired boxes. (Fig. 3).
If data layers are toggled on but not visible in the map view, the magnifying glass with three arrows (‘Zoom Full’) button (Fig. 2 (d)) will bring all visible layers back into the map view. Right clicking on a layer in the Layers Panel and selecting ‘Zoom to Layer’ or clicking on the magnifying glass over a square button (Fig. 2 (e)) in the Map Navigation Toolbar will also bring a desired layer into view in the Map View.
Fig. 3: Toolbars can be added or removed by right clicking on the toolbar area and checking/unchecking boxes.
Lastly, the Menu bar and Toolbars are different ways to access most QGIS functions, such as opening or saving a project or analyzing the data using geoprocessing tools. Panels are another way for users to interact with data layers and functions in QGIS. You can fully customize the look and layout of your QGIS interface by going to ‘View’ in the menu bar and selecting the Panels, Toolbars, etc. that you would like visible.
4) Browse data in the QGreenland project
Layers in QGreenland Core are organized into groups by category. For example, the “Background boundary” layer is “QGreenland boundaries” group, which is itself inside of the “Reference” group (“Background boundary/Reference”).
Toggle layer visibility
Some layers are turned on by default when opening the QGreenland Core project. In order to visualize another data layer (or remove an existing one), toggle the checkbox next to the layer in the Layers panel.
Toggle on the “Ice thickness (150m)” layer, which is in the “Terrain models/Bedmachine” group. The Map view should now include a visualization of Ice thickness at a 150m spatial resolution.
The search bar, located in the Status bar, can also be used to find layers in the Layers panel.
In completing this tutorial, the user has installed QGIS, downloaded and opened the QGreenland Core data package, and learned about the fundamentals of using QGIS to explore QGreenland. Having accomplished this, the user is prepared to explore the many data layers included with QGreenland Core. The user is now ready to approach more advanced topics such as performing geospatial analyses and preparing publication-quality maps with the data in QGreenland Core.