In geoid computation method there were two types of Stokes modification (SM) been developed - the deterministic and the stochastic approach. Examples of the former include Molodenski et. al (1962), Wong & Gore (1969), Meissl (1971) , and Vanicek & Kleusberg (1987). As for the stochastic approach there were only two researchers have ever ventured into it - Sjoberg (1984, 1991 and 2003) and Wenzel (1981, 1983). The main difference between the deterministic and stochastic Stokes modification approach is that in the former minimizing truncation error is the only aim while the latter concerns not only the truncation error but in addition errors in terrestrial gravity data and GGM-derived gravity anomalies were taken into account as well.
In comparing the two stochastic approaches i.e., Sjoberg and Wenzel works, the former was further actively developed and eventually resulted with a complete geoid computation package known as KTH Geolab. Wenzel work was not pursued further other than the two papers published (Wenzel 1981, 1983). Professor Wenzel (b.1948) died in 1999 at age of 54 and that put sort of a full stop to his idea of stochastic approach of Stokes modification.
Photo taken during talk given on Stokes modification geoid
- - - - -
No comments:
Post a Comment