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Title:

USE OF AERIAL SURVEYS AND TOPOGRAPHIC MAPS FOR PROJECTING HIGHWAY ALIGNMENT

Accession Number:

00202683

Record Type:

Component

Abstract:

BY INTRODUCING MODERN METHODS OF HIGHWAY PROJECTION AND THE EFFICIENT USE OF TOPOGRAPHIC MAPS DEVELOPED FROM PHOTOGRAMMETRY, THE LOCATION ENGINEER CAN ESTABLISH ALIGNMENT AND GRADES WHICH COMPLEMENT THE TOPOGRAPHY AND ELIMINATE NEARLY ALL OF THE UNDESIRABLE ASPECTS OF THE OLDER ACCEPTED METHODS OF GROUND LOCATION. IN ORDER TO PROJECT ACCURATE HIGHWAY ALIGNMENT, A COORDINATE GRID SYSTEM MUST BE ESTABLISHED OVER THE AREA THROUGH WHICH THE LOCATION IS TO PASS. THE FINAL RESULTS OF ANY LINE PROJECTED THROUGH THIS AREA WILL BE NO MORE ACCURATE THAN THE ORIGINAL CONTROL USED TO ESTABLISH THE GRID SYSTEM. THE PRESENT PAPER IS BASED ON THE ASSUMPTION THAT THE TOPOGRAPHIC MAP THROUGH WHICH THE HIGHWAY ALIGNMENT IS TO BE PROJECTED IS ACCURATE BOTH HORIZONTALLY AND VERTICALLY, THAT PRE-ESTABLISHED HORIZONTAL AND VERTICAL CONTROL POINTS ARE IN USABLE POSITIONS, AND PLANIMETRIC FEATURES AS WELL DEFINED. SIMPLE AND ACCURATE METHODS OF CALCULATING CURVE POSITIONS BY COORDINATES, SIMPLE PROCEDURES FOR PROJECTING CENTERLINE WHERE GRADE OR LAND USE PROBLEMS EXIST, THE EFFECTIVE USE OF THE SPLINE, SIMPLIFIED USE OF SPIRAL TRANSITIONS AND A SIMPLIFIED, ACCEPTABLY ACCURATE BUT APPROXIMATE, METHOD OF INTRODUCING TRANSITIONS BETWEEN COMPOUND CURVES ARE DISCUSSED. THROUGH INTELLIGENT USE OF THE COORDINATE METHOD OF CENTERLINE PROJECTION, EMPLOYING AN ACCURATE TOPOGRAPHIC MANUSCRIPT, COMPILED BY PHOTOGRAMMETRIC METHODS, BETTER HIGHWAY LOCATIONS CAN BE ACHIEVED ALONG WITH A SUBSTANTIAL SAVINGS IN MAN-HOURS. /AUTHOR/

Supplemental Notes:

No 283, pp 25-38, 6 FIG, 1 TAB Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Accession #:

01410668

Authors:

Winsor, D E

Pagination:

14p

Publication Date:

1961

Serial:

Highway Research Board Bulletin

Issue Number: 283
Publisher: Highway Research Board

Conference:

39th Annual Meeting of the Highway Research Board

Location: Washington DC, United States
Date: 1960-1-11 to 1960-1-15
Sponsors: National Research Council

Media Type:

Digital/other

Uncontrolled Terms:

Grade (Slope); Highway location

Old TRIS Terms:

Subject Areas:

Design; Highways

Files:

TRIS, TRB

Created Date:

Sep 3 1994 12:00AM

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