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LCCM:

OBEC

INDEX:

2505

GPS Control System

OBEC PROJECT

Friday, July 30, 2010

AKA Name:

NAD 83/91 (International Foot) Oregon South Zone (3602)
Latitude:	44° 03' 57.45497"
Longitude:	123° 05' 53.28088"
Northing:	885,043.82
Easting:	4,238,432.93
Scale Factor:	1.000017430
Theta:	-1° 46' 39.02"
Local Reliability:	.03 ft.
Network Reliability:	.10 ft.

Other Information
TRS:	17-03-30
Monumenting Agency:	OBEC Engineering
Monument Date:
Adjusting Agency:	OBEC Engineering
Date Adjusted:	2/12/1999
Status:	Mapping Position - Active

DESCRIPTION: T17S R3W S30 STATION NAME: OBEC BASE STATION IS LOCATED AT 920 COUNTRY CLUB RD. SUITE 100B. THE STATION CONSISTS OF A TRIMBLE 4400 RECEIVER WITH A MICRO-CENTERED L1-L2 WITH GROUND PLANE. IT IS A LOCAL COMMUNITY GPS BASE STATION PRIMARILY USED BY OBEC CONSULTING ENGINEERS FOR RTK GPS SURVEYING. FOR FURTHER INFORMATION CONTACT: MARK ARMSTRONG (BASE STATION MANAGER) OBEC CONSULTING ENGINEERS, INC. 920 COUNTRY CLUB RD., SUITE 100B EUGENE, OR 97401 1-541-683-6090 OFFICE

GEOID99 SEPARATION: -23.304 meters (Ellipsoidal Height = Orthometric Height - Geoidal Separation)

DIFFERENTIALLY LEVELED ELEVATION NAVD88:

GPS DERIVED ELEVATIONS (ORTHOMETRIC HEIGHT):

	NGVD29:	441.1 feet
		134.447 meters

	NAVD88:	444.7 feet
		135.544 meters

NOTE: NAVD88 - NGVD29 = APPROX. 1.097 meters
	Value derived from Vertcon2 (NGS conversion program)

Vertical Reliablity:

CAUTION:

Elevations are GPS derived and may not fit actual ground dependent on how well the geoid model fits at that location.

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