Product/Service

PASS

Source: 3Di LLC
Since the science of photogrammetry began, improving horizontal and vertical accuracies has always been a key goal, but not easily achieved
Since the science of photogrammetry began, improving horizontal and vertical accuracies has always been a key goal, but not easily achieved. In spite of technical advances in equipment and field survey methods, horizontal and vertical accuracies are still limited by the traditional method of acquisition and the altitude of the aircraft.

The problem with traditional surveying and highway mapping is two-fold:

  • Aerial surveying doesn't provide necessary accuracies

  • Ground surveying is too dangerous for the surveyor and the general public. In order to achieve higher vertical accuracies, the aircraft must be operated at a low altitude and a slow pace - unsafe and prohibited by the Federal Aviation Administration (FAA) for a fixed-wing aircraft.

    The Solution

    Stepping out of traditional surveying, 3Di has introduced our Precision Aerial Survey System (PASS) for highly accurate, safe roadway mapping.

    The logical alternative to traditional fixed-wing aircraft aerial survey is to use a helicopter, which is capable of very slow speeds and does not have to adhere to FAA regulations for fixed-wing aircraft.

    3Di selected a transferable-by-trailer Bell 47 helicopter retrofitted with a powerful, high performance turbine engine. Mounted on the Bell 47, a Zeiss RMK TOP 15 camera sits on a vibration-free mounting system. As a result, 3Di can provide a safe and cost effective alternative to obtaining field elevations by traditional field survey methods.

    3Di owns and operates the most precise aerial survey system in the world. The Precision Aerial Survey System (PASS) combines low-level helicopter photogrammetry and precision control surveying to create various map products with vertical accuracies of less than three hundredths of a foot (.03'). The system is primarily used to safely conduct pavement surveys on congested highways, reducing traffic control, traffic congestion and project costs.

    For more information, download our PASS brochure at www.3dillc.com/pdf/pass8.pdf

    3Di LLC, 28969 Information Lane, Easton, MD 21601. Tel: 800-546-4437; Fax: 410-820-5613.