PRECISION PHOTOGRAMMETRY AND HIGHWAY ENGINEERING

THE METHOD EMPLOYED BY THE TEXAS HIGHWAY DEPARTMENT DIVISION OF AUTOMATION IN THE PHOTOGRAMMETRIC COMPILATION OF TOPOGRAPHIC AND PLANIMETRIC MAPS AND MEASUREMENT OF CROSS SECTIONS, PREPARATION OF PHOTOGRAMMETRIC MOSAICS, AND OBTAINMENT OF OTHER ENGINEERING DATA ARE DESCRIBED. METHODS OF GROUND CONTROL, TARGETING, AERIAL PHOTOGRAPHS, EXTENSION OF CONTROL BY PHOTOGRAMMETRIC METHODS, LAYOUT, STEREOSCOPIC PLOTTING AND CROSS SECTION MEASURING, SCRIBING AND REPRODUCTION, AND PHOTOGRAMMETRIC COMPILATIONS AND MEASUREMENTS ARE DESCRIBED. ONCE THE ROUTE LOCATION HAS BEEN DETERMINED, TOPOGRAPHIC MAPS ARE COMPILED AT A CONVENIENT SCALE OF THE DESIGN. THE DESIGNER SELECTS THE POSITION FOR PI POINTS ALONG THE ROUTE FOR ESTABLISHING THE HIGHWAY LOCATION, AND IDENTIFIES THESE POINTS DIRECTLY ON THE MAPS. FROM THE COORDINATE GRID LINES ON THE MAPS, THE PLANE COORDINATES OF THESE PI POINTS ARE MEASURED AND RECORDED. THESE PLANE COORDINATES, TOGETHER WITH THE CURVE DATA FOR ALIGNMENT, ARE FURNISHED TO THE DIVISION OF AUTOMATION. THROUGH THE USE OF THE COMPUTER AND AUTOMATIC PLOTTER, THE EXACT ALIGNMENT IS PLOTTED PRECISELY ON THE MAPS AND STATIONED ACCORDING TO WHATEVER SYSTEM THE ENGINEER DESIRES. ONCE THE CENTERLINE DATA HAVE BEEN SECURED, GROUND SURFACE CROSS SECTIONS ARE MEASURED FROM THE TOPOGRAPHIC MAPS THROUGH THE USE OF THE AUTO-TROL AND ITS ELECTRONIC READ-OUT AND RECORDING SYSTEM. PHOTOGRAPHIC MOSAICS OR THE TOPOGRAPHIC AND PLANIMETRIC MAPS CAN BE USED AT ANY OF THE PUBLIC HEARINGS CONCERNING THE HIGHWAY LOCATION AND DESIGN. IF CONDEMNATION PROCEEDINGS ARE NECESSARY, LARGE-SCALE AERIAL PHOTOGRAPHY DISCLOSES EXACTLY ALL IMPROVEMENTS WHICH HAVE BEEN MADE ON A PIECE OF PROPERTY AND THE EXTENT TO WHICH THESE IMPROVEMENTS MAY BE DAMAGED OR ENHANCED BY THE HIGHWAY.

Media Info

  • Media Type: Print
  • Pagination: pp 41-50
  • Monograph Title: Photogrammetry and aerial surveys
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00202723
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 14 1994 12:00AM