VDOPS - What does VDOPS stand for? The Free Dictionary
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Figure 3(a) shows the dependency of the different DOP terms for a single location (Braunschweig, Germany) and Figure 3(b) focuses on the VDOP at different latitudes.
One interesting fact to mention here is that the VDOP is more vulnerable to elevation masking compared to the horizontal DOP.
Caption: Figure 2: Global simulation of average VDOP using GPS only (5[degrees] elevation mask).