FIGURES (CONTINUED) 



Page 



14. Histogram for Model-3 Spline Point-Value Residuals 33 



15. Amplitude Response of the Two-Dimensional High-Pass Filter 

 Applied to the 80 x 80 Minute Model Field. Contours are in 

 Normalized Units 34 



16. Contours of Point-Mass Anomaly Data After Application of High- 

 Pass Filter. Contour Interval is 0.1 mgls 35 



17. Hand-Drawn Contours of Total -Magnetic Intensity from a Shipboard 

 Magnetic Survey with E-W Tracks spaced 3 nm Apart and Contour 

 Interval of 50 Gammas 37 



18. Machine Drawn Contours of Total -Magnetic Intensity Generated by 

 the Cubic Spline Algorithm from Original Survey Data with Contour 

 Interval of 50 Gammas 38 



19. Model 4 - Survey Plan Applied to Point-Mass Model Data to 

 Simulate a Normal Shipboard Gravity Survey, i.e., Track 



Direction E-W, Track Spacing 3 nm, Sampling Interval 1/3 nm . . . . 39 



20. Histogram for Model-4 Spline Point-Value Residuals 40 



21 . Contours of Mean-Anomaly Residuals Generated from Model-3 

 Survey by Utilization of a Cubic Spline Interpolation Procedure 

 with Contour Interval of 0.5 mgl 42 



22. Contours of Mean Anomaly Residuals Generated from the Model-3 

 Survey by Utilization of a Lagrange Interpolation Procedure with 

 Contour Interval of 0.5 mgl 42 



23. Model 3 Histograms Showing Comparison of Accuracies of Spline 



and Lagrange Algorithms for Computing Mean Gravity Anomalies ... 44 



24. Contours of Mean Anomaly Residuals Generated from Model-4 

 Survey by Utilization of a Cubic Spline Interpolation Procedure 



with Contour Interval of 0.5 mgl 45 



25. Contours of Mean Anomaly Residuals Generated from Model-4 

 Survey by Utilization of a Lagrange Interpolation Procedure 



with Contour Interval of 0.5 mgl 45 



