Accession Number : ADA190144

Title :   Design for Data Extraction from Digitized Contours,

Corporate Author : SCIENCE APPLICATIONS INC MCLEAN VA OCEAN ACOUSTICS DIV

Personal Author(s) : Stieglitz, Robert G

PDF Url : ADA190144

Report Date : Dec 1981

Pagination or Media Count : 14

Abstract : The problem addressed by this exercise is the extraction of a sequence of points (ranges) along specified tracks (generally radials emanating from a given point) which intersect digitized contour lines (of e.g., bathymetry), along with the associated contour values. The points are then sorted to provide the contour values as a function of range along the sequence of radials. The digitized contours and radials are specified as a sequence of (x, y,) longitude, latitude pairs. A Cartesian geometry is assumed. Since distances are computed in the standard Cartesian way, it is totally irrelevant whether the radials and contours are specified in terms of an absolute origin or in terms of a local relative origin. This latter feature of course has advantages when the absolute coordinates are sensitive. In addition, the method makes no assumption about whether the contours are closed or open in the universe under construction. Keywords: Data bases; Numerical methods and procedures; Computer implementation.

Descriptors :   *NUMERICAL METHODS AND PROCEDURES, *COMPUTER APPLICATIONS, *DATA REDUCTION, BATHYMETRY, CARTESIAN COORDINATES, CONTOURS, COORDINATES, DATA BASES, EXTRACTION, GEOMETRY, LATITUDE, SEQUENCES, FORTRAN, COMPUTER PROGRAMS

Subject Categories : Numerical Mathematics
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE