This program is a new version of v.to.rast.
It has the following features:

(1) It does not use a temporary file. Results go directly to the raster map.
    It does this by making one or more passes thru the vector map,
    rasterizing only a fixed number of rows (in memory, default 512),
    writing these rows to the raster map, and then repeating for the
    next set of rows, etc;

(2) The line drawing algorithm is better. The original version of v.to.rast
    moved each line to the nearest grid-cell center before rasterizing.
    This version more nearly reflects the actual path of the vector lines 
    through the grid cells; and

(3) It works for lat/lon databases as well as planimetric databases.

Michael Shapiro
Apr 23, 1991.
