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The University of Hawaii Sea Level Center (UHSLC) in collaboration with the National Oceanographic Data Center (NODC) has prepared a software package for sea level data processing designed for IBM PC compatible microcomputers under the DOS operating system. The package includes three primary tasks: 1) tidal analysis and prediction, 2) quality control, and 3) filtering. The software is geared to those with prior knowledge of the DOS environment as well as a basic understanding of sea level processing. The goal is to share software on a commonly available platform (the personal computer) that will enhance the quality of your sea level data sets. This in return will promote the growth of the international archives of sea level, thus, providing scientists with greater opportunities to understand the ocean. The JASL encourages contibutions to its expanding global archive.
System Requirements
This package has been developed for use on IBM PC XT, AT, 386, 486, or pentium compatible microcomputers and clones. It is designed for 'command line (prompt)' mode, not for Windows. Because of the plotting subroutines and the complex mathematical algorithms of the tidal analysis program, the execution of the programs will be much faster if the host system has a math coprocessor. For an indication of the differences in execution time for various host systems, the Tidal Analysis Function takes the following amount of time:
machine execution time
pentium ~seconds
386, 20 Mhz 1.5 minutes
XT with 8087, 4.77 Mhz 14 minutes
XT, no 8087, 4.77 Mhz 2 hours
The plotting subroutines require a display card capable of supporting graphics in the EGA, CGA, VGA, or Hercules modes, and support hardcopy output on most IBM and Epson printers as well as on most HP PC laser and wet ink plotters. Plot output as a PostScript file are also available. The package works best with at least 512 Kbyte of memory and assumes the system supports a hard disk drive and optionally a 1.4 Mbyte 3.5 inch disk drive.
The batch files of the UHSLC/NODC package utilize PC- DOS or MS-DOS operating system versions 3.1 or greater, and the source codes of the programs were compiled with the Micro-Soft FORTRAN Optimizing Compiler version 4.10. The graphics subroutines are provided by PLOTWORKS, INC.
How To Obtain
The package is packed into a self-creating ZIP file (PKZIP) of the name, slpaq2.exe (1.4 megabytes). One can obtain via FTP or diskette.
Anonymous FTP
enter: ftp ilikai.soest.hawaii.edu
at user prompt enter: anonymous
at password prompt: your email address
(ie. caldwell@hawaii.edu)
after login, enter: cd caldwell_pub/sealev/software
set transfer to binary: binary
grab files: get read.1st {defines files}
get ver3hist.txt {history of changes to package}
get slread2.me {this announcement}
get slpaq2.exe {self-expanding PKZIP file,complete package}
get slman2.ps {PostScript version of manual} OR
get slman2.zip {PKZIP version of slman2.ps--easier to FTP}
exit ftp: bye
Diskette
The compressed self-expanding version fits on a single 3.5" high density diskette and is available upon request.
Unpacking the Package
1) Make subdirectory SLPR2
(Do you have a subdirectory called SLPR2? If so, please rename it to something else because the automatic unpacking and code require the first directory be SLPR2. Also, the package must be placed on and executed from Drive C:)
2) Place the file "slpaq2.exe" on C:\SLPR2.
3) type: slpaq2.exe -d
This will unpack the software and create a directory tree under the directory SLPR2. It requires about 4 megabytes of space. One can delete slpaq2.exe after expansion.
The manual, slman2.ps, can be printed on any PostScript compatible printer or plotter.
Please send me an email to let me know you have obtained a copy. I maintain a list of recipients so that I can send notices of changes. I would also like to obtain your paper mail address for our records. If the software is shared with others, please give me their name and address.