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Abstract:
Abstract. This paper compares several, text and image, lossless
and lossy, compression techniques for regular gridded elevation
data, such as DEMs. Sp_compress and progcode,
the best lossless methods average 2.0 bits per point on USGS DEMs,
about half the size of gzipped files, and 6.2 bits per
point on ETOPO5 samples. Lossy compression produces even smaller
files at moderate error rates. Finally, some technques for
compressing TINs will be introduced.
Wm Randolph Franklin
Tue Jun 13 14:43:17 EDT 1995