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Current Projects: Bethel Airport Improvements
Project Name:
Bethel Airport Improvements
Location:
Bethel , Alaska
Owner:
Alaska
Department of Transportation and Public Facilities
R&M
Survey Team:
Len C. Story, P.L.S.
Hank Brinker, P.L.S.
Bill Preston, L.S.I.T.
Jack Molinaro
Project
Year:
2003 – 2004
Description
of project:
Detailed topographic, planimetric and boundary information
was collected to support our in-house engineering design
effort for the Bethel Airport Improvements project.
Primary horizontal control was established using Static
GPS techniques with four Trimble 4800 dual frequency receivers,
and one Trimble 5700 dual frequency receiver. The GPS vectors
were free adjusted by simultaneous least squares methods
using Trimble Geomatics Office software.
The project vertical datum is based
on ties to Bethel Airport PACS "BET C", NGS PID
no. DF3624. NGS published NAVD88 elevation for BET C is
99.90 feet. Orthometric heights were derived from the project
control using the geoid model GEOID99AK. Project elevations
were established and verified using differential leveling
techniques.
The topographic and planimetric information was collected
using a combination of GPS RTK and conventional surveying
techniques.
The resulting base mapping consisted of over 20,000 data
points and encompassed over 200 acres of improved and un-improved
lands. The airport property plan was also updated to reflect
the acquisition of lands required for the proposed cross
wind runway.
