CLACKAMAS GPS TEST NETWORK
MT. HOOD NATIONAL FOREST, NW OREGON
Clackamas GPS Test Network provides a site for testing P and C/A Code (resource grade) GPS receiver performance under moderate to heavy western oregon timber canopy. The vegetation at the site consists of Douglas Fir and Western Hemlock overstory (approximately 24-40" DBH), with a Vine Maple and Red Alder understory. The terrain at the site is nearly flat. The Test Network consists of thirteen points with geographic positions established by GPS and conventional geodetic survey. These thirteen points are used to define five areas which range from 2.19 to 7.20 acres. Geographic positions for the network points are accurate to 5 cm. Each point is monumented with 5/8" rebar with plastic caps and a nearby orange carsonite fence post, with "survey monument" sticker attached. All points are intervisible and the lines between the survey points have been brushed and flagged.
SITE DIAGRAM AND CLICKABLE THUMBNAIL IMAGES OF SITE:
Image descriptions: 1) At Pt 6 looking toward Pt 7. 2) Data logging at Pt 3B. 3) At Pt 2A. 4) Data logging at Pt 7.
1) 2) 3)
LOCATION AND HOW TO REACH:
The Clackamas GPS Test Network is located approximately 70 road miles southeast of Portland Oregon, on the Clackamas Ranger District of the Mt. Hood National Forest. Directions to the network are: To reach the test network, from the junction of Interstate 205 and State Highway 224 drive easterly on Hwy 224 for approx. 3.5 miles to the junction of State Highways 224 and 214; Turn Right on to Hwy 224 and drive easterly for 14 miles to Estacada, Or; Continue SE on Hwy 224 for 25 miles (note that mileage may now be less due to road realignment) to the junction with Forest Service Road 46 at Ripplebrook Camp Ground; Take the Right fork and continue southeasterly on Forest Service Road 46 for 13.2 miles total to an unsigned dirt road on left; Turn left and continue on dirt track for approximately 100 yards to where the road is blocked. There is an open area here on the left to park in. Continue on foot along road for about 200 yards more, into trees and the test net. Point 2 of the test network is on the right side of road with orange carsonite fence post. Travel time from the downtown Portland is approximately one hour and forty five minutes. The nearest food and lodging are in Estacada, Oregon
NOTE: Point number 3 is has been reported missing. The approximate location is identifiable +/- 1 ft is identifiable just south of the fiberglass post.
REFERENCE STATION INFORMATION:
The closest reference station for differential corrections is
the Portland Community Base Station (CBS)
which is located 83.8 KM ( 52.13 mi) from the site. The Portland CBS is a 12 channel Trimble Community Base Station logging SYNC measurements at 5 second intervals.
The nearest CORS station is "APPLETON" providing broadcast RTCM SC 104 differential corrections at 300 KHz , 100 baud rate. CORS station Appleton is located 97 KM from this site. Post process RINEX 30 second interval data is available from the National Geodetic Survey CORS Page.
For further information, contact Ken Chamberlain, BLM, Oregon State Office, 333 SW First,
Portland, OR 97204; Phone 503-808-6397.
AI1994 *********************************************************************** AI1994 CBN - This is a Cooperative Base Network Control Station. AI1994 DESIGNATION - ESTACADA AI1994 PID - AI1994 AI1994 STATE/COUNTY- OR/CLACKAMAS AI1994 USGS QUAD - ESTACADA (1985) AI1994 AI1994 *CURRENT SURVEY CONTROL AI1994 ___________________________________________________________________ AI1994* NAD 83(1998)- 45 17 54.70673(N) 122 19 57.14353(W) ADJUSTED AI1994* NAVD 88 - 154.32 (meters) 506.3 (feet) LEVELING AI1994 ___________________________________________________________________ AI1994 X - -2,403,623.478 (meters) COMP AI1994 Y - -3,797,379.818 (meters) COMP AI1994 Z - 4,510,840.457 (meters) COMP AI1994 LAPLACE CORR- 5.44 (seconds) DEFLEC99 AI1994 ELLIP HEIGHT- 131.67 (meters) (04/24/00) GPS OBS AI1994 GEOID HEIGHT- -22.67 (meters) GEOID99 AI1994 AI1994 HORZ ORDER - A AI1994 VERT ORDER - THIRD ? AI1994 ELLP ORDER - THIRD CLASS I AI1994 AI1994.The horizontal coordinates were established by GPS observations AI1994.and adjusted by the National Geodetic Survey in April 2000. AI1994.This is a SPECIAL STATUS position. See SPECIAL STATUS under the AI1994.DATUM ITEM on the data sheet items page. AI1994 AI1994.The geoid height was determined by GEOID99. AI1994 AI1994; North East Units Scale Converg. AI1994;SPC OR N - 182,965.092 2,356,289.422 MT 0.99989714 -1 17 58.6 AI1994;UTM 10 - 5,016,330.795 552,332.166 MT 0.99963367 +0 28 27.9 AI1994 AI1994 SUPERSEDED SURVEY CONTROL AI1994 AI1994 NAD 83(1991)- 45 17 54.70485(N) 122 19 57.14281(W) AD( ) B AI1994 ELLIP HT - 131.81 (m) (10/13/99) GP( ) 3 1 AI1994 AI1994 AI1994 STATION DESCRIPTION AI1994 AI1994'DESCRIBED BY CLACKAMAS COUNTY OREGON 1998 (CHH) AI1994'THE STATION IS LOCATED IN THE NORTH PART OF ESTACADA, ON THE NORTH AI1994'SIDE OF ESTACADA HIGH SCHOOL. OWNERSHIP--ESTACADA HIGH SCHOOL, 355 NE AI1994'6TH AVENUE, ESTACADA, OR 97023. CONTACT WILLIAM R. PACKARD, BUSINESS AI1994'MANAGER, ESTACADA SCHOOL DISTRICT CENTRAL OFFICE, PO BOX 519, AI1994'ESTACADA, OR 97023. PHONE 503-630-8521. TO REACH THE STATION FROM AI1994'THE INTERSECTION OF STATE HIGHWAYS 224 AND 211, LOCATED IN THE SOUTH AI1994'PART OF ESTACADA, GO NORTHWEST ON HIGHWAY 224 FOR 0.24 KM (0.15 MI) TO AI1994'THE INTERSECTION OF SE MAIN STREET. TURN RIGHT, NORTH, ON MAIN STREET AI1994'FOR 1.05 KM (0.65 MI) TO THE T-JUNCTION OF NE 6TH AVENUE. TURN RIGHT, AI1994'EAST, ON 6TH AVENUE FOR 0.16 KM (0.10 MI) TO THE FIRST ENTRANCE INTO AI1994'THE ESTACADA HIGH SCHOOL PARKING LOT ON THE LEFT. TURN LEFT, NORTH, AI1994'THROUGH THE PARKING LOT FOR 0.08 KM (0.05 MI) TO THE NORTH END. TURN AI1994'RIGHT, WEST, THROUGH THE PARKING LOT FOR 0.08 KM (0.05 MI) TO THE WEST AI1994'END. TURN RIGHT, NORTH, ON DRIVE PASSING BETWEEN HIGH SCHOOL BUILDING AI1994'ON THE RIGHT AND ESTACADA SCHOOL DISTRICT CENTRAL OFFICE BUILDING ON AI1994'THE LEFT FOR 0.08 KM (0.05 MI) TO A GATE. PASS THROUGH GATE AI1994'CONTINUING NORTH ON GRAVEL SINGLE LANE ROAD FOR 0.24 KM (0.15 MI) TO AI1994'AN EAST-WEST CHAIN LINK FENCE THAT IS ON THE SOUTH SIDE OF AN OPEN AI1994'DRAINAGE DITCH AND THE STATION TO THE RIGHT. THE STATION IS AN AI1994'ALUMINUM COUNTY SURVEYOR DISK SET IN TOP OF A 30 CM ROUND CONCRETE AI1994'MONUMENT FLUSH WITH THE GROUND. IT IS 26.2 M (86.0 FT) EAST FROM THE AI1994'CENTER OF THE GRAVEL ROAD, AND 4.7 M (15.4 FT) SOUTH FROM THE CHAIN AI1994'LINK FENCE.