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gshhs_dp
Langue: en
Version: 146526 (fedora - 04/07/09)
Section: 1 (Commandes utilisateur)
NAME
gshhs_dp - Line reduction using the Douglas-Peucker algorithmSYNOPSIS
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 caricature, 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)Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre