# $Id: offsets_changelog.txt,v 3.3 2004/08/09 23:45:54 rmk Exp $
Changelog:

2003-12-1 (rmk)
 Offsets regenerated using new itemized database.  Several inconsistencies
 in the data were exposed and corrected, but users should mostly find the
 difference transparent to them.
  
2003-11-10 (rmk)
 Offsets regenerated with new formatting code. This is a first step towards
 itemizing offset data individually within the database, as opposed to the
 current method of keeping all data in a single text string.

2003-04-02 (rmk)
 Regenerated using the new tcd code.

2003-01-26 (rmk)
 Made assorted changes, including making the New Zealand "(PCT)" entries
 in both the harmonics and offsets the primary version.  The original
 entries were renamed with a suffix of "(2)".  Other fixes/updates were
 also made at the behest of Walt Bilofsky.

2002-12-02 (rmk)
 Added/updated 697 new offsets. Thanks to Walt Bilofsky for the
 updated NOAA offsets, and to Phil Thornton for his updated harmonics
 and offsets for New Zealand.

2002-08-26 (rmk)
 Added 450 new offsets provided by Walt Bilofsky.

2002-03-27 (rmk)
As requested by Dave Buchholz:
 Names improved for several offsets.

2002-02-11 (rmk)
As requested by Ron Robbins:
 Changed "Pear Point, Lopez Island, 1.1 mile East of, Washington Current"
 to "Pear Point, San Juan Island, 1.1 mile East of, Washington Current".

2001-09-04 (rmk)

(Re)installed harmbase on it's new server after receiving the database
dump from Dave Flater. Updated boilerplate text to reflect that.
Corrected typo in "Fort Canby, Jetty A, Columbia River, Washington"
(was "Canhy").

2001-04-15 (dave)

Corrected latitude of Waitara River Entrance.

2001-04-07 (dave)

Imported offsets for New Zealand contributed by Walt Bilofsky.

2001-03-08 (dave)

Deleted Round Point, Trinity Bay, Texas and Morgans Point, Texas,
which had impossible offsets.

Updated boilerplate.

2001-02-09 (dave)

The method that I was using to check for dangling references was
faulty, so it turns out that there were a lot more than just Norway.
I changed the whole procedure so that subordinate stations should not
even export from the database unless they have a valid reference.

2001-02-06 (dave)

Removed Norwegian subordinate stations left dangling after the
deletion of the TMGPM data from harmonics.txt.

2001-01-22 (dave)

Corrected Ailyn, WA to Allyn, WA.

2001-01-15 (dave)

Renamed the Seavey Island subordinate station to Portsmouth Naval
Shipyard, disputed waters, New England on advice that this is a
different place than the Seavey Island (Back Channel) reference
station.

2000-11-08 (dave)

Deleted Bridgetown, Barbados after Michael Goddard reported that it
disagrees with the local paper as well as direct observation.

2000-10-03 (dave)

Fixed time zones of 19 Québec locations.
Seavey Island, Back Channel, Maine to Seavey Island, disputed waters, New England (courtesy of several conflicting testimonies)

2000-10-01 (dave)

Added Benoa, Bali, Indonesia sent by Manri Offermann.  Changed time zone
  from :Asia/Singapore to :Asia/Ujung_Pandang; this keeps it at +8.
  (N.B., my atlas places Bali just on the Jakarta side, +7.)
Corrections from Bilofsky:
  Montezurna Slough to Montezuma Slough
  Point St. Peter, Québec to Pointe Saint-Pierre, Québec
  Data error in Vulcan Island .5 mi E, San Joaquin River, California Current

2000-09-23 (dave)

Name harmonizations and typo fixes:
  Belem (Para), Brazil to Belém, Pará, Brazil
  Cape Bryant, North Greenland to Cape Bryant, Greenland
  Charlotte Amalie, St. Thomas Island}, Virgin Islands to Charlotte Amalie, St. Thomas, Virgin Islands
  Godthaab, Greenland to Godthåb, Greenland
  Harris, The Narrows}, Choctawhatchee Bay, Florida to Harris, The Narrows, Choctawhatchee Bay, Florida
  Magueyes Island, Puerto Rico to Magueyes Island, Caribbean Sea, Puerto Rico
  Port Burwell, Labrador [2] to Port Burwell, Labrador
  Punta Gorda, Beliza to Punta Gorda, Belize
  Seavey Island, Portsmouth Harbor, New Hampshire to Seavey Island, Back Channel, Maine
  Tiverton, St. Mary Bay, Nova Scotia to Tiverton (Boar's Head), St. Mary Bay, Nova Scotia
  Trinidad Harbor, to Trinidad Harbor, California
  Westport Harbor, Massachusetts to Westport Harbor Entrance, Massachusetts
  Winter Harbour, Melville Island, NWT, Canada to Winter Harbour, Melville Island, Nunavut/NWT
  Yarmouth Harbour, Nova Scotia to Yarmouth, Nova Scotia

Miscellaneous spelling corrections of the accent and tilde variety, in
what is sure to be a long battle against the legacy of 7-bit ASCII.

Deleted duplicates:
  Ferndale, Washington
  Head Harbor, Isle Au Haut, Penobscot Bay, Maine
  Holly Farms Harbor, Washington
  Home, Von Geldern Cove, Washington
  Horsehead Bay, Washington
  McMicken Island, Washington (also, offsets contained typo)
  Woods Hole, Oceanographic Institution, Massachusetts

Corrected time zones of 8 Nunavut locations.
Several more fixes from Walt Bilofsky.

2000-09-21 (dave)
Walt tweaked coordinates of most new offsets to harmonize with
the more accurate ones in nos_station_list.
Fixed broken linkage for all stations referencing Fernandina Beach,
Florida.
Progreso, Mexico changed to Progreso, Yucatan, Mexico to harmonize with
harmonics.world.
2000-09-17 (dave)
Offsets are now dumped from Harmbase.
Added tons of locations translated from lots_of_offsets.txt, the NOAA
web site, and other sources by Walt Bilofsky.
Expanded all "Is." to "Island".
2000-08-30 (dave)
Added encoding to prolog to placate Microsoft parser.
2000-08-29 (dave)
Four renamings from Walt Bilofsky.
2000-08-27 (dave)
Deleted Bangor Wharf, Washington to end conflict with Bangor,
Washington in harmonics.world.
2000-08-21 (dave)
Fixed units in depth of Oakland Inner Harbor Reach Current.
Increased specificity of references for a few locations.
2000-08-20 (dave)
Applied the following batch of corrections from Walt Bilofsky.
  Fixed broken linkage to ref station for Point Hammond.
  Deleted redundant Port Angeles, Washington with bad coordinates.
  Fixed name of Kristiansand (was incorrectly Kristiansund).
  Changed name of Oakland Inner Harbor Reach Current to note depth;
    fixed bogus coordinates.
2000-08-13 (dave) Fixed longitude of Gig Harbor and Discovery Island, 7.6
miles SSE of.  Thanks to Walt Bilofsky.
2000-07-30 (dave)  Nit fixes for compliance with XML 1.0.  Because of #3
below, you must use XTide 2.2.2 or later to be able to access the
stations in this file.  Thanks to August Hahn for identifying the
non-conformities.
   1. For compatibility, removed line of dashes from header comments.
      (XML 1.0 section 2.5)
   2. Syntax of prolog:  downcased XML; removed RMD attribute.
      (XML 1.0 section 2.8)
   3. Surrounded list of stations with a single root entity
      (XML 1.0 section 2.1)
2000-06-18 (dave)  Added Washington subordinate stations from August Hahn.
2000-04-23 (dave)  Unaliased Woods Hole Oceanographic Institut{e|ion}.
2000-04-12 (dave)  Fixed broken linkage to ref station of Oakland Inner Harbor
Reach Current.
2000-04-10  Added Port Everglades sent by Tom Cook.
1999-08-14  Added Cape Porpoise and Kennebunkport sent by Jonathan
R. Senning (senning@sodor.ne.mediaone.net) but replaced coordinates
with those of the NOS list.
1999-07-08  Added Norway data contributed by Olex AS (olex@olex.no).
1998-12-20  Added the avglevel and direction attributes used by Thomas
Dean to the Oakland example.
1998-12-13  Added 7 subordinate stations in Massachusetts and North
Carolina from Rob Thieler (rthieler@usgs.gov).
1998-12-06  Added 61 subordinate current stations in Washington from
Thomas D. Dean.
1998-06-28  Renamed Brunswick, Maine (2) to Brunswick, Maine.  Added
Barnegat Inlet, New Jersey, replacing data set in harmonics.  Added
Port Angeles, Washington (2) due to complaints about the data in
harmonics and/or harmonics.canadian.  The new one agrees with none of
the previous.  Sigh.
1998-06-02  Discovered source of offsets at
http://www.opsd.nos.noaa.gov/tp4days.html.  Found the complete offsets
for my "simple" example, Reagan National Airport.  Installed those,
replaced simple example with Head Harbor, Isle au Haut (which really
_does_  have simple offsets), and added Machiasport and Brunswick,
Maine (2).  (Machiasport because I'm going there, and Brunswick for
comparison with the regular predictions, which are suspicious).
1998-04-12  Added Saipan Harbor from AED and Wellfleet from "Zak"
(zebroz@wpi.edu)
1998-02-22  Renamed National Airport per congressional mandate.
1998-01-11  First made publicly available.


For the most part, you should be able to figure out how to encode any
given subordinate station from the documentation at
http://www.flaterco.com/xtide/harmonics.html.  However, there are some
things you should know.

1.  "max" offsets apply to High Tide, Max Flood, and Min Ebb events
    (i.e., all events that appear as maxima in the graph).
2.  "min" offsets apply to Low Tide, Max Ebb, and Min Flood events
    (i.e., all events that appear as minima in the graph).
3.  "level" (in levelAdd and levelMultiply) refers to tide height
    or current velocity, as applicable.
4.  If slack offsets are not provided for a current station, they will
    be set to the average of the max and min time offsets.
5.  If time zone is not provided, it will be inherited from the
    reference station.

-->