ADJUSTMENT OF STATE PLANE COORDINATES

THE SYSTEM OF PLANE COORDINATES ESTABLISHED ON SEA LEVEL DATUM BY THE U.S. COAST AND GEODETIC SURVEY FOR EACH STATE IS A UNIFIED METHOD FOR COORDINATING ALL TYPES OF SURVEYS, WHETHER PLOTTED TO SMALL OR LARGE SCALE. MOST OF THE DISTANCES, HOWEVER, FROM COORDINATES ON MAPS CONTROLLED BY AND COMPILED ON SUCH A SYSTEM, WILL NOT AGREE WITH DISTANCES ON THE GROUND UNLESS SCALE CORRECTIONS ARE APPLIED. THIS EFFECT BECOMES ESPECIALLY CONSEQUENTIAL WHEREVER THE MAPS ARE COMPILED AT LARGE SCALE. TO CIRCUMVENT THE NEED FOR CORRECTION OF EACH MAP DISTANCE, AS IT IS USED FOR ENGINEERING, CADASTRAL, OR OTHER PURPOSES, IT IS EASY TO COMPUTE PROJECT COORDINATES BY USE OF A COMBINED SCALE AND ELEVATION ADJUSTMENT FACTOR APPLIED TO THE SYSTEM OF STATE PLANE COORDINATES. WHEN THIS IS DONE BEFORE THE MAPPING IS ACCOMPLISHED, THERE IS NO NEED FOR SCALE CORRECTION BECAUSE DIFFERENCE IN COORDINATES AND DISTANCES ON THE MAPS WILL AGREE WITH HORIZONTAL DISTANCES MEASURED ON THE GROUND. WHENEVER STATE PLANE COORDINATES AT SEA LEVEL DATUM ARE REQUIRED, THEY CAN BE COMPUTED FROM THE PROJECT COORDINATES BY REVERSE USE OF THE ADJUSTMENT FACTOR. THE PRINCIPLES OF STATE PLANE COORDINATES AND METHODS OF THEIR ADJUSTMENT FOR LARGE-SCALE ENGINEERING SURVEYS ARE DISCUSSED. /AUTHOR/

Media Info

  • Monograph Title: Photogrammetry - developments and applications: 1958
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00202703
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 16 1994 12:00AM