Coordinates are NAD83 (North American Datum 1983) (1992) Montana HARN latitude, longitude.įig 2-Site diagram for the Powell, ID, GPS test course. The error estimates for the network observations are in the 2-centimeter range. The GEOID99 model (equations used to define the spherical surface of the Earth) was used to estimate geoid separation. Final results were calculated from a least squares adjustment of the data using fixed integer baselines from the geodetic observations. Three data sets were observed from HARN (High Accuracy Reference Network) stations LOLO GPS and W522. The GPS control survey was conducted with four Trimble 4000SSE/SSI geodetic GPS receivers with L1/L2 (the two GPS signal frequencies) compact dome geodetic antennas operating in the static mode. The conventional survey was conducted with a Topcon total station. The ground traverse and geodetic control survey of the Powell, ID, GPS test course was done by the Forest Service’s Northern Region engineering staff and the Lolo National Forest’s cadastral survey group. The polygon can be divided to produce two The course has 11 turning points or stations At most stations, theĬanopy would be considered heavy. Valley bottom with only a small amount of understory. The canopyĬonsists of large (24-inch d.b.h.) old-growth cedar and spruce trees in a flat Of the course obstruct the view there at an angle of 15 degrees. Highway 12 at the Idaho highway maintenance area aboutġ2 miles west of Lolo Pass and about 55 miles southwest of Missoula, MT. This GPS test site is located on the Clearwater National Forest’s Powell Rangerĭistrict. Test Courses 0171-2809-MTDC: Introduction Table of Contents
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