[IGSMAIL-3115]: update of RINEX compression programs

[Yuki Hatanaka]

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IGS Electronic Mail      28 Nov 06:02:34 PST 2000      Message Number 3115
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Author: Yuki Hatanaka

Dear colleagues,

This is an announcement of the release of the new version (2.4.0) of
the RINEX compression programs.

In this release, nothing is changed on usage and results of the programs,
but the running speed is very much improved. (The result of benchmark
test is attached below.) This is achieved only by replacing an inefficient
function "sprintf" with "atoi" or "atol". The change from the former
version (2.3beta) is minimal to minimize the possibility to bring bugs
into the programs.

The binary files for LINUX, HP-UX, SUN Solaris, DEC UNIX, Windows 95/98
are available from following address together with source codes.

    ftp://terras.gsi-mc.go.jp/pub/software/RNXCMP_2.4.0/

    (Remark: GSI's domain name "gsi-me.go.jp" will be changed to
          "gsi.go.jp" from January.)

Most of the users of the former version only need to replace the two
binaries RNX2CRX and CRX2RNX. If you are using machines other
than the above, the source code can be compiled by using ANSI C compiler.
See docs/README file in the

Since this update is not for fixing bugs, the former programs are still
valid to use. At current, the ftp archive of IGSCB contains the former
version. I recommend to replace them with the newer ones
after appropriate procedure.

Best Regards,
Yuki
-------------------------------------------------
HATANAKA,Yuki,  Geographical Survey Institute
                e-mail : hata at gsi-mc.go.jp
-------------------------------------------------

--------------------------------------------------------
Comparison of running time (2.3beta and 2.4.0)
data : zimm2240.99o (1 Hz sampling, 70458749 byte)

(1) compression: RNX2CRX zimm2240.99o
                                 2.3beta     2.4.0    (ratio)
  LINUX2.2.14 (Pentium 400MHz)    49.30sec   22.09sec (44.8%)
  HPUX10.20   (236MHz)            59.74      24.72    (41.4%)
  SunOS 5.5.1 (167MHz)            72.00      36.00    (50.0%)
  LINUX on DEC ALPHA (600MHz)     39.79      15.99    (40.2%)
  DEC OSF1 V4.0 (600MHz)          39.630     10.413   (26.3%)
  Windows98   (Pentium 233MHz)   178.89      84.97    (47.5%)


(2) uncompression: CRX2RNX zimm2240.99d
                                 2.3beta     2.4.0    (ratio)
  LINUX2.2.14 (Pentium 400MHz )   55.58sec   37.16sec (66.9%)
  HPUX10.20   (236MHz)            58.43      40.75    (69.7%)
  SunOS 5.5.1 (167MHz)           108.00      94.00    (87.0%)
  LINUX on DEC ALPHA (600MHz)     38.58      23.37    (60.6%)
  DEC OSF1 V4.0 (600MHz)          38.093     22.602   (59.3%)
  Windows98   (Pentium 233MHz)   368.99     137.75    (37.3%)
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