GRASS GIS Quickstart

       When  launching  GRASS GIS for the first time, you will open a default project "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 , project  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).

        project (previously called location)
           A  project  is defined by its coordinate reference system (CRS).  In the case of the default project,
           it is a geographic coordinate reference system WGS84 (EPSG:4326). If you have  data  in  another  CRS
           than WGS84, you should create a new project corresponding to your system.

        mapset (a subproject)
           Each  project  can  have  many  mapsets  for  managing  different  aspects  of a project or project’s
           subregions. When creating a new project, 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 project, 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 project to current database" management icon .

       To  work with your own data, you typically want to first create a new project with a coordinate reference
       system (CRS) suitable for your study area or one that matches your data’s CRS. The  Project  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 project with the Project Wizard
       If  you know the CRS of your data or study area, you can fill EPSG code or description and Project 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 project, 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 project’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 project 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: Thursday Aug 01 11:29:08 2024

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       © 2003-2024 GRASS Development Team, GRASS GIS 8.4.0 Reference Manual

GRASS 8.4.0                                                                                     helptext(1grass)