NATIONAL GEODETIC SURVEY
    ELECTRONIC DISTANCE MEASUREMENT LEAST SQUARES ADJUSTMENT

REMARKS:

THIS PROGRAM IS USED TO DETERMINE THE SCALE AND CONSTANT
CORRECTION OF ELECTRONIC DISTANCE MEASURING INSTRUMENTS BY MAKING
MEASUREMENTS OVER PREVIOUSLY DETERMINED BASE LINES.  THE FORMULAS
USED IN THE PROGRAM ARE FROM THE NOAA TECHNICAL MEMORANDUM NOS
NGS-10.  THE USE OF CALIBRATION BASE LINES.

ENCLOSED IS A DISK CONTAINING A COPY OF BOTH THE TURBO BASIC
SOURCE CODE (CALIBRAT.BAS) AND EXECUTABLE MODULE (CALIBRAT.EXE)
FOR THE CALIBRATING OF AN EDMI VIA A "LEAST SQUARED SOLUTION".

PROGRAM CONSTRAINTS:

     (1)  THE BASE LINE MEASURED MUST HAVE MORE THAN 2 POINTS AND
          LESS THAN 16 POINTS.
     (2)  THE NUMBER OF USER OBSERVATIONS MUST BE MORE THAN 2 AND
          LESS THAN 211.

THE PUBLISHED BASE LINE DISTANCES AND USER OBSERVATIONS ARE
INPUTTED VIA FILES RATHER THAN BY OBSERVATIONAL PROMPTS WITHIN
THE PROGRAM.  BOTH THE PUBLISHED BASE LINE DISTANCE FILE AND USER
OBSERVATION FILE (WHOSE FILENAMES AND LOCATIONS ARE TOTALLY UP TO
THE USER) MUST HAVE RECORDS OF THE FORM:

             FROM POINT NUMBER, TO POINT NUMBER, DISTANCE

THE RECORDS CAN BE IN ANY ORDER AND SEPARATED BY EITHER COMMAS OR
BLANKS.  THE POINT NUMBERS NEED ONLY TO BE UNIQUE; THEY DO NOT
NEED TO BE CONSECUTIVE. (I.E - YOU CAN USE POINT DESIGNATIONS FOR
THE POINT NUMBERS.)

EXAMPLE:
          150,800,650.2345
     OR   800 150 650 2345

FOR AN 'N' POINT BASE LINE, THERE ARE  N * (N - 1) / 2 SEGMENTS.

THE PROGRAM PROMPTS ARE SELF-EXPLANATORY.  HOWEVER A NULL
RESPONSE FOR EITHER THE PUBLISHED BASE LINE DISTANCE FILENAME OR
USER OBSERVATION FILENAME WILL TERMINATE THE EXECUTION.

THE COMPLETE RESULTS ARE WRITTEN TO A FILE 'RESULTS.DAT' WHICH
WILL RESIDE IN THE CURRENTLY CONNECTED DIRECTORY.

FOR TECHNICAL QUESTIONS, PLEASE CALL (301)443-8631, OR WRITE:

     NATIONAL GEODETIC INFORMATION CENTER (N/CG174)
     NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION
     6001 EXECUTIVE BOULEVARD
     ROCKVILLE, MD  20852