GRASS GIS Quickstart
When launching GRASS GIS for the first time, you will open a
default Location "world_latlog_wgs84" where you can find a map layer
called "country_boundaries" showing a world map in the WGS84 coordinate system.
The main component of the Data tab is the Data Catalog
which shows the GRASS GIS hierarchical structure consisting of
- GRASS Database (directory with projects)
- Running GRASS GIS for the first time, a folder named "grassdata" is automatically
created. Depending on your operating system, you can find it in your $HOME
directory (*nix) or My Documents (MS Windows).
- Location (a project)
- A Location is defined by its coordinate reference system (CRS).
In the case of the default Location, it is a geographic coordinate reference system
WGS84 (EPSG:4326). If you have data in another CRS than WGS84, you should create
a new Location corresponding to your system.
- Mapset (a subproject)
- Each Location can have many Mapsets for managing different aspects of
a project or project's subregions. When creating a new Location, GRASS GIS
automatically creates a special Mapset called PERMANENT where the core
data for the project can be stored.
For more info about data hierarchy, see
GRASS GIS Database page.
First, if you would like to get to know GRASS better before importing your own data,
please download provided samples such as the "North Carolina" dataset.
You can simply reach them through
"Download sample location to current database" management icon
To work with your own data, you typically want to first create a new Location
coordinate reference system (CRS) suitable for your study area or one that
matches your data's CRS. The Location Wizard
will help you with that by guiding you through a series of dialogs to browse
and select predefined projections (also via EPSG code) or to define individual
If you know the CRS of your data or study area,
you can fill EPSG code
or description and Location Wizard finds appropriate CRS from a predefined list
If you do not know CRS of you data, you can read it from your georeferenced
data file (e.g. shapefile or GeoTiff file with the related metadata properly
After creating a new Location, you are ready to import your data. You can use
simple raster or vector data import
or a variety of more specialized tools.
If the data's CRS does not match your Location's CRS, data will be automatically reprojected.
After import your raster or vector data are added as a layer to Map Display.
To change layer properties, go to Display tab.
To analyze your data, search for a tool in the Modules tab.
GRASS GIS can be run entirely without using the graphical user interface.
of running GRASS GIS from a command line.
GRASS GIS 8 Reference Manual
GRASS GIS 8 startup program manual page
GRASS GIS tutorials and books
List of EPSG codes (Database of worldwide coordinate systems)
Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
Main index |
Topics index |
Keywords index |
Graphical index |
GRASS Development Team,
GRASS GIS 8.2.2dev Reference Manual