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