Accession Number : AD0709675

Title :   CONPLOT I. A CONTOUR GENERATING PROGRAM.

Descriptive Note : Final rept.,

Corporate Author : BRADFORD COMPUTER AND SYSTEMS INC NEW YORK

Personal Author(s) : Fleshel,B. ; Stewart,A. J. ; Gilman,M.

Report Date : MAY 1970

Pagination or Media Count : 181

Abstract : A contour generating system (CONPLOT I) is described whose input is a UNAMACE created magnetic tape. Output of this system are cartographic quality contour maps which can be combined to form larger maps. These contour maps include (a) Universal Transverse Mercator Grid, (b) variable contour levels, (c) labelled and broadened index contours, (d) depression indications, and (e) a variable output plotting scale. The following data handling techniques are used: (a) parallel processing, (b) random access, (c) binary searching, and (d) binary sorting. The internal processing of the input data includes (a) redundant data elimination, (b) noise elimination and data smoothing by either an Area Smoothing Algorithm or a Least Squares Smoothing Algorithm, (c) contour smoothing equations and (d) fitting of resultant contours to streams to insure 'natural appearing' intersections. The report also includes an analysis and a discussion of algorithms used for contour map shading.

Descriptors :   (*MAPPING, COMPUTER PROGRAMMING), CURVE FITTING, BINARY ARITHMETIC, LEAST SQUARES METHOD, NUMERICAL ANALYSIS, GEOMETRIC FORMS, ALGORITHMS

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE