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Surveyed elevation PointsMonument is typically a standard City of Gresham Control Monument, being a 2 inch bronze disk with raised datum point (Berntsen Model CD2LB), Stamped “City of Gresham Control Do Not Disturb”.Vertical: NGVD29 US Survey Feet*May 2013- updateGPS receivers are TOPCON HIPER+, static L1 L2Vector reduction performed by TOPCON Tools Software, v 8Least Squares adjustment performed by STAR*NET Software, v 7.1Each control point was occupied for a minimum of one hour, on each of two different days. The values established on the points were constrained to a minimum of three City of Gresham primary control points. |