02-02-2009
Thank you kindly Zazzon and Quirk!
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LEARN ABOUT DEBIAN
gshhs_dp
GSHHS_DP(1gmt) Generic Mapping Tools GSHHS_DP(1gmt)
NAME
gshhs_dp - Line reduction using the Douglas-Peucker algorithm
SYNOPSIS
gshhs_dp input.b tolerance output.b [-v]
DESCRIPTION
gshhs_dp reads the binary coastline (GSHHS) or political boundary or river (WDBII) files and and reduces the complexity of the line by
applying the Douglas-Peucker algorithm. It automatically handles byte-swabbing between different architectures.
input.b
GSHHS or WDBII binary data file as distributed with the GSHHS data supplement. Any of the 5 standard resolutions (full, high,
intermediate, low, crude) can be used.
tolerance
tolerance is maximum mismatch in km. The larger the value the more reduction will take place.
output.b
The reducted data set.
OPTIONS
-v Reports progress and statistics while running.
EXAMPLES
To simplify the full GSHHS data set with a custom tolerance of 2 km, try
gshhs_dp gshhs_f.b 2 gshhs_2km.b
REFERENCES
Douglas, D. H., and T. K. Peucker, Algorithms for the reduction of the number of points required to represent a digitized line of its cari-
cature, Can. Cartogr., 10, 112-122, 1973.
AUTHOR
This implementation of the D-P algorithm has been kindly provided by Dr. Gary J. Robinson, Environmental Systems Science Centre, University
of Reading, Reading, UK (gazza@mail.nerc-essc.ac.uk); his subroutine forms the basis for this program.
SEE ALSO
GMT(1), gshhs(1), gshhstograss(1)
GMT 4.5.7 15 Jul 2011 GSHHS_DP(1gmt)