Ionospheric Effects on Microwave Signals - Atmospheric Effects in Space Geodesy - page 67

developing combined maps globally. Dettmering et al. ( 2011b ) performed combina-
tion of different techniques for regional modeling of the ionosphere. All these studies
prove that the combined maps provide a more homogeneous coverage and higher
accuracy and reliability than results of each single method. Figure 4 depicts a snap
shot of a GNSS, satellite altimetry, and F3C combined GIM at 9UT of day 202, 2007
(Alizadeh et al. 2011 ).
Acknowledgments The authors wish to express their heartfelt gratitude to Manuel Hernández-
Pajares from the Research group of Astronomy and GEomatics (gAGE) of the Technical University
of Catalonia (UPC)—Barcelona, and also to Michael Schmidt from the Deutsches Geodätisches
Forschungsinstitut (DGFI)—Munich, for the revision of this part and their valuable advice for
improving the script. The Austrian Science Fund (FWF Der Wissenschaftsfonds) is also deeply
appreciated for funding projects VlbIonos (project P16136), COMBION (project P19564), MDION
(project P22203), and GGOS Atmosphere (project P20902).
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