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From: "J. Graham Cogley" <gcogley@pipcom.com>
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Subject: GGHYDRO Release 2.2, June 1998
Date: Mon, 8 Jun 1998 23:07:11 -0400
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8 June 1998
Dear Colleague,
In response to some recent inquiries I have completed Release 2.2
of the global hydrographic database GGHYDRO, and I thought that you
might be interested to know of its availability. It can be obtained via
FTP from ftp://ftp.trentu.ca/pub/gghydro and is described in more detail
in the README file appended below.
With best wishes,
Graham Cogley.
gcogley@
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_/_/ _/ _/_/_/ _/ _/ _/_/ _/_/_/ .ca
Department of Geography, Trent University, Peterborough, Ontario,
CANADA K9J 7B8. Fax 705-748-1205. Tel 705-748-1440.
gcogley@trentu.ca
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
GGHYDRO - Release 2.2
Copyright (C) J.G.Cogley 1987,1991,1994,1998
This release of GGHYDRO differs from Release 2.1 by virtue of a
substantial number of editorial corrections of the data in diverse
locations. File format, file-handling software and the number of
data files are unchanged. The only fields unaffected by revisions
are DUNE, SMRS, SFLT, ILAK and IRIV. The most significant changes
are to GLAC, which formerly recorded too much glacier ice in central
Asia and too little in southern Alaska. A fuller description of the
revisions will be found at the end of this file.
GGHYDRO Release 2.2 is available by File Transfer Protocol from
the site ftp://ftp.trentu.ca/pub/gghydro. Data files are in sub-
directory /data. GGHYDRO is organized into nineteen files, plus one
supplementary file. The name of each file begins with 'GGH' (to
identify the file as part of GGHYDRO) and ends with '.CMP' (to
indicate that the file contains compressed data). The rest of the
filename is a 4-character mnemonic code which describes the field
contained in the file, thus:
GGHLAND.CMP GGHILAK.CMP GGHSFLT.CMP
GGHFLAK.CMP GGHGLAC.CMP GGHDSRF.CMP
GGHSWMP.CMP GGHDUNE.CMP GGHFRIV.CMP
GGHSLTW.CMP GGHSMRS.CMP GGHIRIV.CMP
GGHMS05.CMP GGHBAS1.CMP GGHBAS2.CMP
GGHCRYO.CMP
GGHRNOF.CMP GGHRNER.CMP GGHRICE.CMP .
The supplementary file is GGHBAS2.LST, which lists the codes occurring
in GGHBAS2.CMP and provides additional information for interpreting the
codes.
Accompanying the data are
i) this file, GGHREAD.ME
ii) an ASCII file called GGHRLS22.DOC and a TeX file called
GGHRLS22.TEX which describe the dataset in more detail
(they contain the same information)
and iii) three files containing sample Fortran programs:
GHCMPLIS.FOR is for decompressing .CMP files and
GHLISCMP.FOR is for compressing the decompressed files
generated by GHLISCMP; both programs require file
GHFLRWLS.FOR as well. These programs are in Fortran and
are self-explanatory. Once compiled, either
GHCMPLIS.OBJ and GHFLRWLS.OBJ or GHLISCMP.OBJ and
GHFLRWLS.OBJ must be linked to create an execution
module (usually with extension .EXE); the resulting .EXE
file can then be run to decompress or compress data.
More detailed suggestions are given on these matters in
GGHRLS22.DOC.
GGHYDRO may be used freely, provided that it not be sold for profit
and that it be duly acknowledged in any published work; the following
form of citation is suggested:
Cogley, J.G., 1998, GGHYDRO -- Global Hydrographic Data,
Release 2.2. Trent Climate Note 98-1, Department of
Geography, Trent University, Peterborough, Ontario, Canada.
Any problems with GGHYDRO should be directed to Dr J.G.Cogley,
Department of Geography, Trent University, Peterborough, Ontario,
Canada K9J 7B8. (Phone 705-748-1440. Fax 705-748-1205. Internet
GCOGLEY@TRENTU.CA.)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
GGHYDRO - Revision Log, 2.1-to-2.2
Jun 98:
Release 2.2 completed. The only fields unaffected by revisions in Jan
96 and Jun 98 are DUNE, SMRS, SFLT, ILAK and IRIV.
Relocated Peter I Island from 229W to 269W, and Northern Territory cell
altered in Jan 96 to 13S from 11S; eliminated spurious island between
Prince Edward Is and Crozet Is in S Indian Ocean.
Corrections to FRIV in New South Wales; NE Mexico; Portugal; and Nova
Scotia.
Made new MS05 to take account of the above alterations and those of Jan
96.
Corrected several dozen cells in CRYO, BAS1 and BAS2, mostly because of
mismatches with new land mask MS05.
Corrected RNOF and RNER in middle Syr Darya basin, Crete, southern
Yucatan and some other locations. Added estimates of RNOF and RNER
for several hundred cells counted as land in the 1x1 MS05 land mask
but not the equivalent 2x2 mask.
Corrected RICE in Eights Coast/Pine Island Bay region where two 2x2
zones had been transposed between 240W and 279W.
---------------------------------------------------------------
Jan 96:
Extensive revision of GLAC in central Asia and southern Alaska; in
central Asia a uniform reduction factor was applied to take account
of original misinterpretation of white map shading.
Corrections (involving LAND, SLTW, GLAC, FLAK and SWMP) in: N
Ellesmere I, and five other cells in Arctic Canada; NW Greenland;
central Finland; two cells in Perak, Malaya; one cell in Northern
Territory, Australia; and Nova Scotia.
Added southern tip of Baja California; Balleny Is; and Peter I Island.
Improved CRYO by adding permafrost in Mongolia and South America, and
sea ice (codes 5 and 6)
---------------------------------------------------------------
22 Feb 1995: Nile basin code in BAS2 corrected from '4' (Mediter-
ranean) to ASCII 168