Horizontal and Vertical Control Network. The horizontal datum used by the PDB team must be the Central Oregon Coordinate System (COCS). The vertical datum used must be NGVD 29. We will establish primary geodetic control monuments (such as 5/8-inch iron rod with plastic cap or other permanent markers) and maintain line of sight throughout the entire Project limits. These control monuments must be placed in locations such that they can be used during construction. Secondary Control points used to develop survey surface model in non- critical areas must be no more than one (1) “
Horizontal and Vertical Control Network. Consultant shall establish horizontal control according to ODOT standards in place at time of Project, using Terrestrial (Theodolite and electromagnetic distance measuring (“EDM”)), GPS (Static, Rapid Static, and/or Real Time Kinematics (“RTK”)), or a combination of both. Consultant shall set and adjust monuments in conformance with ODOT guidelines in place at time of Project. Consultant shall refer to guidelines in the current ODOT Route Surveying Manual and the Right of Way Engineering Manual. Upon completion, Consultant shall submit a control report to the ODOT for review and acceptance. The scope of this effort will be defined and approved by the City prior to executing the work. A budget of 40 hours has been established for this task. Consultant shall use 5/8” diameter rebar rods with brass caps, or other ODOT approved monuments for the GPS and network points. Consultant shall establish a minimum of three (3) GPS or terrestrial survey network control points throughout the length of the survey. Consultant shall establish vertical control using differential leveling methods as defined in ODOT’s 1998 Route Surveying Manual. Consultant shall establish vertical control for the horizontal control points needed for the digital terrain mapping as described as a part of Task 2.4.
Horizontal and Vertical Control Network. The purpose of this task is to provide the means by which the Project can be located relative to horizontal and vertical datum, map projection, and coordinate systems. Consultant shall establish a horizontal and vertical control network using the Central Oregon Coordinate System (COCS) for the horizontal datum. The vertical datum will use NAVD 88.
