[UW-GIS-L] vertical adjustement of 1947?
dfinlays at u.washington.edu
Wed Jul 2 21:35:15 PDT 2003
It has been some time ago, but I recall reading a good review of NGVD 29
in a report in the Engineering Library. I searched for it and it may be
International Symposium on the North American Vertical Datum (3rd : 1985
: Rockville, Md.)
You may also find references in there that could lead to an answer.
Derek Stuart wrote:
> Does anybody know anything about the 1947 vertical adjustment to the NGVD
> 1929 vertical datum.
> I've noticed mention of it in a couple of NOAA Published Bench Mark Sheets
> (ie. http://co-ops.nos.noaa.gov/benchmarks/benchmarks_old/9431647.html).
> The following line can be found in the above example:
> "NGVD reference is based on adjustment of 1947 and NOS levels of 1991."
> Can anybody explain this sentence to me?
> Derek Stuart
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