TABLE OF CONTENTS 



Page 



INTRODUCTION 1 



DEVELOPMENT OF THE CUBIC SPLINE ALGORITHM FOR GRIDDING 



TRACK TYPE SURVEY DATA 3 



THE BICUBIC SPLINE ALGORITHM FOR THE GENERATION OF 



MEAN ANOMALIES 10 



GENERATION OF MODELS FOR TESTING THE ACCURACY OF 

 INTERPOLATION PROCEDURES 14 



A. The Two-Dimensional Fast Fourier Transform as a Tool 



for Simulated Survey Design 14 



B. Development of a Point-Mass Model Field 18 



COMPARISON OF GRIDDING TECHNIQUES AND THE COMPUTATION 



OF MEAN ANOMALIES USING MODEL DATA 19 



A. Gridding of Survey Data 21 



B. Mean Gravity Anomaly Calculations 36 



CONCLUSIONS 43 



REFERENCES 49 



APPENDIX A - FORTRAN PROGRAM FOR GRIDDING AND 



COMPUTATION OF MEAN ANOMALIES USING THE CUBIC SPLINE . . A-l 



APPENDIX B - FORTRAN PROGRAM FOR GENERATING MEAN 

 ANOMALIES USING THE BICUBIC SPLINE B-l 



APPENDIX C - FORTRAN PROGRAM FOR POINT-MASS MODEL DATA . C-l 



APPENDIX D - FORTRAN PROGRAM FOR THE TWO-DIMENSIONAL 



FAST FOURIER TRANSFORM D-l 



