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: Wednesday Jan 01 00:19:26 2025

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