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/*! \mainpage GRASS 6 Programmer's Manual
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<!-- * doxygenized from "GRASS 5 Programmer's Manual"
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* updated 8/2005, 2006, 2007, 2008
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<a href="http://grass.osgeo.org">GRASS GIS</a> (Geographic Resources
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Analysis Support System) is an open source, Free Software
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<em>Geographical Information System</em> (GIS) with raster,
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topological %vector, image processing, and graphics production
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functionality that operates on various platforms through a graphical
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user interface (GUI) or command line interface (CLI). It is released under GNU
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General Public License (GPL).
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This manual introduces the reader to the <i>Geographic Resources Analysis
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Support System</i> from the programming perspective. Design theory, system
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support libraries, system maintenance, and system enhancement are all
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presented. Standard GRASS 4.x conventions are still used in much of the
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code. This work is part of ongoing research being performed by the
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<a href="http://grass.osgeo.org/community/team.php">GRASS Development Team</a>,
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an international team of programmers,
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GRASS module authors are cited within their module's source code and the
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contributed manual pages.
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© 2000-2009 Markus Neteler / GRASS Development Team<br>
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Published under GNU Free Documentation License (GFDL)
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http://www.fsf.org/copyleft/fdl.html
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This manual comes with ABSOLUTELY NO WARRANTY. The development of GRASS
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software and this manual is kindly supported by the
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<a href="http://www.osgeo.org">Open Source Geospatial Foundation</a>,
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who provides the GRASS main infrastructure.
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Main web site: <a href="http://grass.osgeo.org">http://grass.osgeo.org</a>
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<h2>Table of contents</h2>
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<i>Missing entries below are either not yet uploaded to SVN (need to be migrated
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from GRASS 5 Programmer's manual) or are simply undocumented.</i>
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http://trac.osgeo.org/grass/browser/grass-web/trunk/images/grass6_arch.odp
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\image html "grass6_arch.png" "GRASS 6 Architecture"
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\section corelibs Principal library
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(the name refers to the directory name in lib/ in the source code)
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- gis: \ref gislib, with following subsection
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- Sites File Processing (legacy, merged into \ref gisvectorlib)
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\section libs Further libraries
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(the name refers to the directory name in lib/ in the source code)
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- arraystats: Library of statistics for arrays of doubles - \ref arraystats (new, under development)
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- bitmap: Bitmap library for X Window Bitmaps - \ref bitmap
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- btree: Binary tree library - \ref btree
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- cairodriver: <a href="http://cairographics.org">Cairo</a> display driver library - \ref cairodriver
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- cdhc: Library for testing normality and exponentiality - \ref cdhc
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- cluster: Library for cluster analysis (image processing) - \ref cluster
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- datetime: DateTime library - \ref datetime
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- display: \ref displaylib
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- %driver: Graphics monitor driver
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- dspf: DSPF libary - \ref dspf (obsolete?)
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- edit: Raster edit library (cellhd, history, cats) - \ref edit
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- external: External libraries from other projects (such as shapelib or bwidget) - \ref external
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- fonts: Hershey library - \ref fonts
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- form: TCL/TK forms library - \ref form (obsolete?)
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- gmath: \ref gmathlib (generic mathematical functions and BLAS/LAPACK library wrapper)
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- gpde: \ref gpdelib (partial differential equations library)
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- gtcltk: Tcl/Tk stuff - \ref gtcltk
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- imagery: \ref imagerylib
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- init: \ref init (GRASS initialization code + scripts)
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- linkm: Linked list memory manager - \ref linkm (obsolete?)
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- ogsf: \ref ogsflib (OpenGL (R) ported gsurf library (required for NVIZ))
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- pngdriver: PNG display driver library - \ref pngdriver
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- proj: \ref projlib (wrapper to PROJ4 projection library)
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- psdriver: PostScript display driver library - \ref psdriver
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- python: \ref pythonlib
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- raster: \ref rastergraphicslib (note: raster map functions are in \ref gislib)
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- rowio: Raster row in/out library - \ref rowio
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- rst: Library for interpolation with regularized splines with tension - \ref rst
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- segment: \ref segmentlib (segment library for segmented raster reading)
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- sites: Old Sites library, now interfaced to \ref Vector_Library - \ref sites
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- stats: Raster stats library - \ref stats
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- symbol: Drawing symbols for %point %vector data library - \ref symbol
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- vask: Cursor management library - \ref vask
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- %vector: \ref Vector_Library (GRASS Vector and Direct Graph Library)
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- vedit: \ref Vedit_Library - %vector editing
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- nviz: \ref nvizlib (used by wxGUI Nviz extension and CLI-based Nviz module)
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<!--<li>image3: extra imagery library (mainly still unused) - \ref image3lib-->
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<!--<li>D: display library - \ref d_displaylib-->
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<!--<li>front.end: interface for interactive modules library - \ref frontend-->
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\section interfaces Interfaces
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- GRASS <a href="http://download.osgeo.org/grass/grass6_progman/swig/">SWIG interface</a>
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- <a href="http://download.osgeo.org/grass/grass6_progman/gui/wxpython/">wxGUI</a></li>
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\section location File structure of GRASS Location
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A GRASS <b>raster map</b> consists of several files in several subdirectories in a mapset,
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organized as follows:
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map header including projection code, coordinates representing
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the spatial extent of the raster map, number of rows and columns, resolution,
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and information about map compression;</li>
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- <b>cell/, fcell/ or grid3/</b>:
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generic matrix of values in a compressed, portable
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format which depends on the raster data type (integer, floating %point or 3D grid);</li>
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history file which contains metadata such as the data source,
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the command that was used to generate the raster map, or
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other information provided by the user;</li>
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optional category file which contains text or numeric labels assigned
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to the raster map categories;</li>
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optional color table;</li>
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optional timestamp, range of values, quantization rules (for floating %point maps)
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and null (no-data) files; </li>
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A GRASS <b>%vector maps</b> are stored in several separate files in a single
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directory. While the attributes are stored in either a DBF file, a SQLite file
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or in an external DBMS (PostgreSQL, MySQL, ODBC), the geometric data are saved
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- <b>head</b>: %vector map ASCII header with information about the map creation
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(date and name), its scale and threshold;</li>
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- <b>coor</b>: binary geometry file which includes the coordinates of graphic
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elements (primitives) that define the %vector feature;</li>
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- <b>topo</b>: binary topology file describes the spatial relationships between the
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map's graphic elements;</li>
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- <b>hist</b>: history ASCII file with complete commands that were used to
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create the %vector map, as well as the name and date/time of the map
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- <b>cidx</b>: binary category index file which is used to %link the %vector
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object IDs to the attribute table rows;</li>
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- <b>dbln</b>: ASCII file which contains definition(s) of %link to attribute
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storage in database (DBMS).</li>
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http://trac.osgeo.org/grass/browser/grass-web/trunk/images/loc_struct.odg
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\image html "loc_struct.png" "Diagram of GRASS file structure"
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