1. Introduction
1.1 Outline of Survey Results
1.1.1 Table of survey results and lists of survey results
1) Survey results prepared in the year
1999 consist of six types of coordinate results where four are based
respectively on local, horizontal, GRS80 and ITRF94 coordinate systems and two
are based respectively on local and horizontal coordinate systems with geoid
correction.
2) Furthermore, the results of the survey conducted once every
year between 1996 and 1998 have been revised in the same format as the survey
results in 1999 after recalculating.
3) As shown in Table 1 below, all of
these aforesaid survey results are compiled in the following two formats: (1) gTable
of Survey Resultsh where all the six types of survey results have been compiled
separately by location (observation station) and by year; and (2) gList of
Survey Resultsh where coordinate results based on horizontal coordinate system
(with geoid correction) for the last four years (from 1996 to 1999) are
displayed collectively.
Table 1 Types of survey results
Types 
Coordinate system 
Geoid correction 
Coordinate value 
Table
of survey results 
Local
coordinate system 
Without 
X, Y, Z 
Ditto 
With 
X, Y, Z 

Horizontal
coordinate system 
Without 
N, E, U 

Ditto 
With 
N, E, U 

GRS80
coordinate system 
Without 
Latitude,
longitude, ellipsoidal height 

ITRF94
coordinate system 
Without 
X, Y, Z 

List
of survey results 
Horizontal
coordinate system 
With 
N, E, U 
4) Four types of coordinate system shown
in Table 1 are as follows:
(a) Local
coordinate system
This is a coordinate system that ITRF94 earthcentered orthogonal coordinate
system be shifted to the reference point (gstation datumh from hereafter).
There is one station datum for each station..
Station datum: Koganei station > S3, Kashima station > S3, Miura
station > S3, Tateyama station > L2
(b) Horizontal
coordinate system
Orthogonal coordinate system with plumb line axis set as Uaxis, east as Eaxis
and north as Naxis at station datum (set in each observation station).
(c) GRS80
coordinate system
The geodetic coordinate system in ITRF94 frame where GRS80 ellipsoid is used.
(d) ITRF94
coordinate system
Earthcentered orthogonal coordinate system with Greenwich direction set as
Xaxis, earthfs axis as Zaxis and the direction of Xaxis around Zaxis that
has been turned 90 degrees counterclockwise as Yaxis.
1.1.2 Observation values of SLR reference point (using survey
method B)
1) Observation values of SLR reference point using survey method
B are the observation values of horizontal angle, vertical angle and slope
range of survey points shown in Table 2 below that have been measured by
NET2B.
Table 2 Horizontal angle reference directional
point and survey points at each station (observation station)

Koganei station 
Kashima station 
Miura station 
Tateyama station 
Horizontal
angle reference directional point 
H1 
Survey suspended 
S1 
H1 
Survey points 
L1,
L2, L3, H1, H2 SRL1,
SRL2, SRH1,
SRH2 
L1,
L2, L3, H1 SRL1,
SRL2, SRL3 SRH1 
L1,
L2, L3, H1, H2 SRL1,
SRL2, SRH1,
SRH2 
2) Survey points SR** in Table 2
indicate the position of the center of the secondary mirror (reflection sheet
for surveying has been attached) inside SLR telescope while SLR telescope aimed
at long pillars L1, L2, L3 and leveling pillars H1, H2, respectively.
3) Horizontal angles shown in survey results are the values
observed when the horizontal angle reference directional point was set as the
reference point (0 deg. 0f 0h) and the vertical angles are the values observed
when the zenith was set as the reference point (0 deg. 0f 0h).
4) L2 point at Koganei station was not
possible to be measured by NET2B, because of interference of visibility.
Therefore, this point was measured by lifting a reflection sheet (241.8mm above
L2 point).
5) At Kashima station, the survey was
suspended due to some unknown reasons caused at the SLR telescope side that
made it impossible to measure the range by NET2B.
6) At Miura station, observation values
could not gained from H2 point due to a structure that blocked the optical
route between SLR telescope and this point.