[OSRS-PROJ] orthographic projection with proj4 and mapserver.

Markus Neteler neteler at itc.it
Thu Aug 14 11:36:03 EDT 2003

On Thu, Aug 14, 2003 at 11:27:58AM -0400, Gerald I. Evenden wrote:
> 3. Anyone know of current "erosion" programs?  Programs that remove
> 	points from a coastline file based on the complexity of the
> 	coastline itself.  15 years ago I had a couple of reasonable
> 	procedures but have since lost them.

Yes, the GSHHS project provides such code:
  -> gshhs_dp.c
	"/*	@(#)gshhs_dp.c	1.1  05/18/99
	 * gshhs_dp applies the Douglas-Peucker algorithm to simplify a line
	 * segment given a tolerance.  The algorithm is based on the paper
	 * Douglas, D. H., and T. K. Peucker, Algorithms for the reduction
	 *   of the number of points required to represent a digitized line
	 *   of its caricature, Can. Cartogr., 10, 112-122, 1973.
	 * The impmementation of this algorightm has been kindly provided by
	 * Dr. Gary J. Robinson, Environmental Systems Science Centre,
	 * University of Reading, Reading, UK
	 * Paul Wessel, 18-MAY-1999
	 * Version: 1.1 Added byte flipping
	 *	    1.2 Explicit binary read for DOS.  POSIX compliance

Kind regards

Markus Neteler     <neteler at itc.it>       http://mpa.itc.it
ITC-irst, Istituto per la Ricerca Scientifica e Tecnologica
MPBA - Predictive Models for Biol. & Environ. Data Analysis
Via Sommarive, 18        -       38050 Povo (Trento), Italy
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