Summary of coordinates for GISP2 and Summit Base Station: August 2005, April 2006, June 2006.

ALL COORDINATES ITRF-00

August 10 2005

GISP2 (antenna placed directly on GISP2 borehole with quick-release adapter, stop-and-go kinematic point from BASE, probably +/- 15 cm horizontal/vertical error)

72 34 33.55924
38 27 53.65474
3253.142
0m to bottom of antenna mount, Zephyr

BASE (temporary base station on top of Green House, 8-hour PPP solution)

72 34 45.07330
38 27 25.77130
3257.103
0m to antenna phase center, Zephyr Geodetic

April 26 2006

GISP2 (antenna screwed directly on to newly installed monument, 24-hour PPP solution)

72 34 33.55590 
38 27 53.79110 
3252.820
0m to bottom of antenna mount, Zephyr

SUMM (newly installed permanent base station, 1-hour baseline tie to GISP2)

72 34 45.07321
38 27 25.89562
3256.010
0m to bottom of antenna mount, Zephyr Geodetic

June 16 2006

GISP2 (antenna screwed directly on to monument, 24-hour PPP solution, occupation performed AFTER ~2.5 m extension added to borehole casing)

72 34 33.55460
38 27 53.81520
3255.292
0m to bottom of antenna mount, Zephyr

SUMM (permanent base station, 1-hour baseline tie to GISP2)

72 34 45.07299
38 27 25.92000
3255.909
0m to bottom of antenna mount, Zephyr Geodetic