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 Database , Location  and Mapset .

        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.

GRASS started in the default Location, now what?

       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 with a 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 projections.

   Creating a New Location with the Location Wizard
       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).

   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’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.

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.

See also

        GRASS GIS Reference Manual
       GRASS GIS startup program manual page
       GRASS GIS tutorials and books

       List of EPSG codes (Database of worldwide coordinate systems)

SOURCE CODE

       Available at: GRASS GIS Quickstart source code (history)

       Accessed: Monday Apr 01 03:06:41 2024

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       © 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual

GRASS 8.3.2                                                                                     helptext(1grass)