vii berichte von fachinstituten an universitäten und technischen
vii berichte von fachinstituten an universitäten und technischen
vii berichte von fachinstituten an universitäten und technischen
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388 Fachinstitute <strong>an</strong> Universitäten <strong>und</strong> Hochschulen<br />
classical remove-restore technique. Long wavelength<br />
features are removed using a global spherical harmonic<br />
solution. The residual field is then <strong>an</strong>alyzed with the Slepi<strong>an</strong><br />
functions <strong>an</strong>d the long-wavelength features are added back<br />
to the coefficients. By this method <strong>an</strong> improvement in highlatitude<br />
areas c<strong>an</strong> be achieved. The improvement depends<br />
on the gro<strong>und</strong> track density <strong>an</strong>d the quality of the a priori<br />
long-wavelength field. In J<strong>an</strong>uary 2004 the gro<strong>und</strong> track<br />
was dense <strong>an</strong>d consequently the spherical harmonic solution<br />
is of high quality but nevertheless <strong>an</strong> improvement of up<br />
to 5m 2 /s 2 in potential values or 50cm in geoid height is<br />
achieved.<br />
Figure 9: Spherical harmonic solution (left) <strong>an</strong>d Slepi<strong>an</strong> solution (right) w.r.t. GGM02s in J<strong>an</strong>uary 2003<br />
Figure 10: Spherical harmonic solution (left) <strong>an</strong>d Slepi<strong>an</strong> solution (right) w.r.t. GGM02s in June 2003
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