Accession Number : ADA018147

Title :   Computing a Line-of-Sight Using Digital Image Matching and Analytical Photogrammetry.

Descriptive Note : Research note,

Corporate Author : ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA

Personal Author(s) : Ackerman,David L. ; Crombie,Michael A.

Report Date : MAR 1975

Pagination or Media Count : 24

Abstract : This report presents a method for computing a line-of-sight by using digital gray shade data, analytical photogrammetry, and computer software. The computer program combines a digital image matching process with stero-triangulation to produce a profile between the end points of the line. A 1,192 meter line-of-sight profile has been computed. The probability of computing an entire line in one program execution is low. This is due to matching problems in areas of sparse imagery and steep slopes. This experiment created more questions than answers. The questions involved patch size, pixel size, pixel spacing, computation time, computer memory, and quantization of the digital gray shade data. The profiling technique could be used for engineering jobs such as cut and fill, profiling for dam planning, volume determination of piles of earth from excavations, and profiling craters. (Author)

Descriptors :   *Line of sight, *Photogrammetry, Stereophotogrammetry, Profiles, Computer programs, Memory devices, Geometry, Mathematical models, Digital systems, Triangulation, Computer program documentation

Subject Categories : Cartography and Aerial Photography
      Computer Programming and Software
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE