Package org.geotools.gce.grassraster

GRASS input/output drivers In this package the I/O drivers for reading and writing GRASS raster maps are placed.

See:
          Description

Class Summary
DummyProgressListener A dummy progress listener.
GrassBinaryImageReader ImageIO reader for the grass binary raster format.
GrassBinaryImageWriter  
GrassCoverageReader Coverage Reader class for reading GRASS raster maps.
GrassCoverageReadParam Represents the read parameters in the geotools space, as opposed to GrassBinaryImageReadParam that are for the imageio space.
GrassCoverageWriter Coverage Writer class for writing GRASS raster maps.
JGrassConstants Constants used by the JGrass engine
JGrassMapEnvironment Represents the structure around a map inside a grass database.
JGrassRegion Represents the geographic region used in the jGrass engines.
JGrassUtilities A facade of often used methods by the JGrass engine
 

Package org.geotools.gce.grassraster Description

GRASS input/output drivers

In this package the I/O drivers for reading and writing GRASS raster maps are placed.

To better understand the code a good overview should be taken on the GRASS database-Location-Mapset structure, of which a short introduction is given below.

File structure of GRASS Location

A GRASS raster map consists of several files in several subdirectories in a mapset, organized as follows: Most important files and folders for now:

The cell header file

A typical grass map header looks like the following:
proj: 1
zone: 13
north: 4928000
south: 4914000
east: 609000
west: 590000
cols: 950
rows: 700
e-w resol: 20
n-s resol: 20
format: 0
compressed: 1


Reclassified files

If the first line reports 'reclass' then this file is a reclassified file and the original data file is given by the following two lines:
reclass
name: soils
mapset: PERMANENT
#1 5 3 8 .... ....

The color table file

Colortables for GRASS 5 and greater are supported.

The format of the color file, which is located in location/mapset/colr/mapname is the following:

The first line is a % character and two numbers indicating the minimum and maximum data values which have colors. Note that in JGrass after the range values we add a third value for alpha support.

After the first line, the list of color rules appears, that can be of the following formats:



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