Accession Number : ADA954108
Title : Helicopter Survey Methods for Mapping.
Descriptive Note : Interim rept.,
Corporate Author : ARMY ENGINEER RESEARCH AND DEVELOPMENT LABS FORT BELVOIR VA
Personal Author(s) : McGregor,R. P.
Report Date : 15 MAR 1948
Pagination or Media Count : 52
Abstract : This 1948 interim report covers an investigation and field tests conducted to determine the feasibility of using a helicopter to serve as a visible signal for triangulation and trigonometric leveling in establishing secondary control for mapping in difficult terrain. The purpose is to develop and test a method for establishing secondary control points for topographic mapping in which a helicopter is used as a signal for horizontal and vertical direction observations from ground stations of known position and elevation. The minimum accuracies acceptable are 1 part in 2,000 in horizontal position and plus or minus 5 feet in elevation.
Descriptors : *HELICOPTERS, *MAPPING, TRIANGULATION, VISUAL SIGNALS, SURVEYING(GEOGRAPHIC), TOPOGRAPHIC MAPS, CONTROL, SECONDARY, LEVELING, TRIGONOMETRY
Subject Categories : Cartography and Aerial Photography
Distribution Statement : APPROVED FOR PUBLIC RELEASE