Res-2018-142 Bowers Field Master Plan Update

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BOWERS FIELD-AIRPORT MASTER PLAN CONTROL SURVEYING The aerial photography will be completed with ABGPS control which will be used for the base control for the geo-referencing of the aerial imagery. We will process the ABGPS data using COR stations and reference it to the project control datums: Horizontal: North American Datum of 1983/2011 (NAO 83(2011)), in the Washington State Plane Coordinate System, North Zone in US survey feet. Vertical: North American Vertical Datum of 1988 (NAVO 88) We will complete all of the remaining on-site ground control surveys, including: • Geodetic control validation of the existing airport PACS and SACS stations or establish temporary airport control according to the guidelines established in AC 150/5300-16A • Obtain all necessary ground control photo identifiable control check points required to validate the ABGPS control. • Control of all the airport runway end positions • Collection of vertical profiles for all runways • Collection of the position, elevation, and where required the appropriate navigational aid perpendicular point of all electronic and visual navigational aids (NAVAIDS) located on the airport and associated with any current instrument approach servicing the airport • Control for any obstruction obstacles or airport planimetric features that cannot be collected by photogrammetric methods • Complete map checks for feature attribute data and update the final map file attribution • Preparation and upload of a survey and quality control plan, Imagery plan, and final project report as required for submission to the FAA AGIS online database. • All other tasks, not specifically listed above, as outlined in FAA AC-18B, Table 2-1 "Survey Requirements Matrix for Airport Layout Plan." ORTHOPHOTO MAPPING We will use the control solution and scans of the aerial negatives to generate a Digital Elevation Model (DEM) for the VG surfaces. The aerial scans will be processed into color digital orthophotos using the aforementioned DEM to rectify the images. Orthophotos for the entire project area will be developed with a 1.0' pixel resolution and be delivered in a GeoTIFF file format via external hard drives VGA OBSTRUCTION SURVEYS The VGA Obstructions Surfaces will satisfy the following requirements of the AC 150/5300-188: • 2.7.1.2 Analysis of Runway 11/29 (to be renumbered 12/30 Mag. Dec) and Runway 7/25 with Vertically Guided Operations (Surfaces include the VGRPS, VG PCS, VGAS, VGPS, VGATS, VGHS and VGCS) Page I 5