THE GCARS SYSTEM

GENERALIZED COMPUTER AIDED ROUTE SELECTION (GCARS) SYSTEMS WERE DEVELOPED TO ASSIST ENGINEERS IN DEFINING AND RANKING A SERIES OF REGIONAL HIGHWAY LOCATION ALTERNATIVES. THE ORIGINAL GCARS WAS DEVELOPED ON THE CDC 6500 COMPUTER IN THE FORTRAN IV PROGRAMMING LANGUAGE; IT INCLUDED 28 COMPUTER ROUTINES--8 MAIN PROGRAMS AND 20 ASSOCIATED SUBROUTINES. SOME OF THESE ROUTINES PERFORM SPECIFIC OBJECTIVES WITHIN DATA PREPARATION AND SEARCH ACTIVITIES. THE REMAINING ROUTINES PRODUCE CONTOUR MAPS OF THREE-DIMENSIONAL DATA EITHER ON THE LINE PRINTER OR ON THE OFF-LINE PLOTTER. GCARS MAIN PROGRAMS ARE: (1) VECTOR - COMPUTES TERRAIN ROUGHNESS, VARIABILITY MEASURES, STRIKES AND DIPS. PRODUCES WULFF STEREONET PLOTS OF VECTORS AND PREPARES HISTOGRAMS OF STRIKES AND/OR DIPS, (2) LOADS - LOADS IRREGULARLY SPACED DATA FROM CARDS TO TAPE ACCORDING TO PRESCRIBED FORMATS, (3) LOADG - LOADS GRIDDED DATA ARRAYS FROM CARDS TO TAPE ACCORDING TO PRESCRIBED FORMAT, (4) TREND - COMPUTES TREND SURFACE EQUATIONS ACCORDING TO LEAST SQUARES CRITERIA, ANALYSIS OF VARIANCE STATISTICS, AND EVALUATES COMPUTED TREND EQUATION AT SPECIFIC COORDINATE LOCATIONS, (5) RESMAP - PREPARES DATA FOR PRODUCTION OF CONTOUR MAPS, (6) NETSUM - CALCULATES MINIMUM PATHS, PREPARES AND PRINTS MAP OF PATHS, (7) MAPPER - INTERPOLATES IRREGULARLY SPACED TO GRIDDED DATA SETS; COMPUTES MEAN, RANGE, AVERAGE OF DATA ARRAYS; PRODUCES CONTOUR MAP OF GRIDDED DATA ON PRINTER; AND PERFORMS HYPSOMETRIC ANALYSIS, AND (8) CONTUR - SCANS DATA AND LOCATES CONTOURS; AND TRACES EACH CONTOUR. /BPR/

• Corporate Authors:

  Purdue University

  School of Aeronautics and Astronautics
  West Lafayette, IN  United States  47907

  Indiana State Highway Commission

  Indianapolis, IN  United States  46204

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Turner, A K
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Computer programs; Contours; Highways; Information processing; Location; Maps; Mathematical models; Route choice
• Uncontrolled Terms: Highway location
• Subject Areas: Design; Highways;

Filing Info

• Accession Number: 00202576
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: May 13 1970 12:00AM