ON THE NEW NATIONAL GEODETIC DATUM 2000 IN KOREA
Prof. Hongsic YUN, Korea
Key words: Primary Precise Geodetic Network (PPGN),
New Korea Geodetic Datum, ITRF97, GRS80.
Abstract
The first nationwide geodetic network in the Korean peninsula was
established in 1910-1915 by the Bureau of Land Survey, the
Government-General of Korea in cooperation with the Japanese Military
Land Survey. The major network of the old triangulation consisted of
thirteen baselines, primary and secondary networks, and were connected
to the Tokyo Datum with the triangulation through Tsushima Islands.
After the World War II, the network over the Korean straight (Tsushima
straight) was resurveyed in 1954 by US Army Map Service Far East in
cooperation with Geographical Survey Institute of Japan, in order to
strengthen the connection between Korea and Japan. To keep consistency
with the old coordinates system, the PPGN was adjusted in the way that
its official coordinates are same as the old ones. Unfortunately,
original records of the old survey are lost during the Korean war, and
we only have a set of coordinates of triangulation points now. The
establishment of Primary Precise Geodetic Network (PPGN) was carried
out in 1975-1994 by National Geography Institute of Korea. The PPGN
consists of 1155 points including 175 (~15 %) old first- and
second-order triangulation points (normal points) not damaged by the
war, and its mean side-length is about 11 km. The coordinates of PPGN
derived in 1995 have been held fixed since. During the 1980's and
1990's the increased use of satellite based geodetic measuring systems
- such as the GPS - began to impact on the utility of the national
geodetic datum in Korea. Under this impact, new geocentric datum, New
Korea Geodetic Datum 2000 (NKGD2000), designed and built during 1998,
is realized through ITRF97 and used the GRS80 ellipsoid. A description
of the new datum, its design, and implementation will be described.
CONTACT
Assoc. Prof. Hongsic Yun
Department of Civil and Environmental
Sungkyunkwan University
Chun Chun Dong 300
Suwon
KOREA
Tel. + 82 31 290 7522
Fax + 82 31 290 7549
E-mail: yhs@geo.skku.ac.kr
23 March 2001
This page is maintained by the
FIG Office. Last revised on 05-11-25.
|
