2-D and 3-D Trend Analysis - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 253

Fig. 7.14 Autocorrelation functions for Arbuckle elevations at locations shown in Fig. 7.13 .
(a) Original data; (b) residuals from quadratic trend surface; (c) residuals from cubic trend surface.
About half of the estimated autocorrelation coefficients are based on samples of more and less than
100 pairs of values, respectively (Source: Agterberg 1970 , Fig. 4)