GETTING FROM MAP TO GROUND

TRANSFERRING THE DESIGNED CENTERLINE OF A HIGHWAY LOCATION FROM PHOTOGRAMMETRICALLY COMPILED TOPOGRAPHIC MAPS TO THE GROUND CAN BE ACCURATELY AND EFFICIENTLY ACCOMPLISHED WHEN A SYSTEM OF PLANE COORDINATES IS USED FOR CONTROL OF THE MAPPING AND FOR PREPARATION OF A MATHEMATICAL DESCRIPTION OF THE CENTERLINE. ACCURATE SURVEYS ON THE GROUND, AND/OR ACCURATE PHOTOGRAMMETRIC TRIANGULATION, THROUGH MANMADE OR NATURAL OBJECTS OR FEATURES WHICH APPEAR AS SMALL AND EASILY IDENTIFIABLE IMAGES ON THE MAPPING PHOTOGRAPHY, PROVIDE THE HORIZONTAL CONTROL AND CHECKS ON VERTICAL CONTROL FOR COMPILATION OF THE TOPOGRAPHIC MAPS. THE GROUND POSITION AND PLANE COORDINATES OF EACH OF THE SURVEYED IMAGES, AND THE COMPUTED PLANE COORDINATES OF POINTS OF CHANGES IN CURVATURE ON THE DESIGNED CENTERLINE ARE THE BASIC DATA FROM WHICH DISTANCES AND BEARINGS ARE COMPUTED FOR MEASUREMENT ON THE GROUND. SUCH DATA ARE THE ESSENTIALS FOR BEGINNING CENTERLINE STAKING AND SERVE AS INTERMEDIATE TIES FOR CHECKING POSITION DURING THE PROCESS OF TRANSFER OF THE CENTERLINE MAPS TO GROUND WHEN THE DESIGNED LOCATION IS STAKED IN READINESS FOR CONSTRUCTION OF THE HIGHWAY. THE TECHNIQUES INVOLVED IN THE FOREGOING PROCEDURES ARE DESCRIBED AND ILLUSTRATIONS GIVEN OF THEIR APPLICATIONS IN SPECIFIC CASES. /AUTHOR/

Media Info

  • Monograph Title: Photogrammetry: developments and applications, 1960
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00202685
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 3 1994 12:00AM