Accession Number : ADA302492

Title :   The ALBE Gridded Visibility Model.

Descriptive Note : Final rept. Jan 91-Jul 93,

Corporate Author : ARMY TOPOGRAPHIC ENGINEERING CENTER FORT BELVOIR VA

Personal Author(s) : Stoltz, Vernon

PDF Url : ADA302492

Report Date : MAY 1995

Pagination or Media Count : 29

Abstract : The AirLand Battlefield Environment (ALBE) visibility model provides a new method of calculating Line of Sight visibility products derived from digital terrain elevation data. This new method uses a gridded raster approach rather than the historical vector approach. The basic principles and assumptions behind the model ar discussed, starting with the advantages and disadvantages of using the gridded versus a vector approach. New methods devised to handle the gridded approach are discussed, including how to determine the grid cell resolution, the spacing between individual radials, and a detailed look at determining the spacing between individual points along a radial. A new method that uses a unique step size for each individual radial is described in detail. Other features covered are the earth's curvature, the inclusion of vegetation data, the visual acuity, and an elevation matrix form to help select a precise observer location. Finally, other closely related models that are based on the basic visibility model are discussed, including How High to Visibility, Radio Frequency Loss, Visibility Probability, Line of Sight for Obstacles, Aerial Detection, and Helicopter Approach Zones.

Descriptors :   *BATTLEFIELDS, *GRIDS, *VISIBILITY, *AIR LAND BATTLES, *TERRAIN MODELS, DATA BASES, LINE OF SIGHT, OBSERVERS, DIGITAL SYSTEMS, POSITION(LOCATION), DETECTION, SIZES(DIMENSIONS), PROBABILITY, AIRBORNE, RESOLUTION, TERRAIN, CURVATURE, HELICOPTERS, PRECISION, HISTORY, SIGHTS, VECTOR ANALYSIS, LOSSES, ELEVATION, VEGETATION, EARTH(PLANET), DECISION AIDS, RADIOFREQUENCY, VISUAL ACUITY, RASTERS.

Subject Categories : Cartography and Aerial Photography
      Military Operations, Strategy and Tactics

Distribution Statement : APPROVED FOR PUBLIC RELEASE