.TH helptext 1grass "" "GRASS 8.3.2" "GRASS GIS User's Manual"
.SH GRASS GIS Quickstart
.PP
When launching GRASS GIS for the first time, you will open a
\fBdefault Location\fR \(dqworld_latlog_wgs84\(dq where you can find a map layer
called \(dqcountry_boundaries\(dq showing a world map in the WGS84 coordinate system.
.br
.PP
The main component of the Data tab is the \fIData Catalog\fR
which shows the GRASS GIS hierarchical structure consisting of
Database ,
Location  and
Mapset .
.IP " \fBGRASS Database\fR (directory with projects)" 4m
.br
Running GRASS GIS for the first time, a folder named \(dqgrassdata\(dq is automatically
created. Depending on your operating system, you can find it in your $HOME
directory (*nix) or My Documents (MS Windows).
.IP " \fBLocation\fR (a project)" 4m
.br
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.
.IP " \fBMapset\fR (a subproject)" 4m
.br
Each Location can have many Mapsets for managing different aspects of
a project or project\(cqs 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.
.PP
For more info about data hierarchy, see
GRASS GIS Database page.
.SH GRASS started in the default Location, now what?
.PP
First, if you would like to get to know GRASS better before importing your own data,
please download provided samples such as the \(dqNorth Carolina\(dq dataset.
You can simply reach them through
\(dqDownload sample location to current database\(dq management icon
\&.
.PP
To work with your own data, you typically want to first create a new Location
with a
coordinate reference system (CRS) suitable for your study area or one that
matches your data\(cqs 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
projections.
.SS Creating a New Location with the Location Wizard
.PP
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
of projections.
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
included).
.SS Importing data
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\(cqs CRS does not match your Location\(cqs 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.
.SH Text\-based startup and Location creation
GRASS GIS can be run entirely without using the graphical user interface.
See examples of running GRASS GIS from a command line.
.SH See also
\fI
GRASS GIS Reference Manual
.br
GRASS GIS startup program manual page
.br
GRASS GIS tutorials and books
\fR
.PP
List of EPSG codes (Database of worldwide coordinate systems)
.SH SOURCE CODE
.PP
Available at:
GRASS GIS Quickstart source code
(history)
.PP
Accessed: Thursday Mar 07 18:14:28 2024
.PP
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.PP
© 2003\-2024
GRASS Development Team,
GRASS GIS 8.3.2 Reference Manual