Geo::Raster 0.42

Geo::Raster is a Perl extension for raster algebra.

SYNOPSIS

use Geo::Raster;
or
use Geo::Raster qw(:types);
or
use Geo::Raster qw(:types :logics :db);

Geo::Raster is an object-oriented interface to libral, a C library for rasters and raster algebra. Geo::Raster makes using libral easy and adds some very useful functionality to it. libral rasters are in-memory for fast and easy processing. libral rasters can be created from GDAL rasters. GDAL provides access to rasters in many formats.

Geo::Raster also adds the required functionality to display rasters in Gtk2::Ex::Geo.

Each cell in raster/grid is assumed to be a square.

The grid point represents the center of the cell and not the area of the cell (when such distinction needs to be made). TODO: This needs more attention.

A grid is indexed like this:

j = 0..N-1
------------------>
.
i = 0..M-1 .
.
.
V
there is also a (x,y) world coordinate system
maxY ^
.
.
y .
minY .
------------------>
minX maxX
x

minX is the left edge of first cell in line. maxX is the right edge of the last cell in a line. minY and maxY represent similarly the boundaries of the raster.