Test Dataset 1 - Residual Stacking

Number of data points per bin - day 297-311 of 2000

Residuals have been stacked over a 15 day period from day 297 - 311 in 2000, using approximately 1 x 1 degree bins. The number of data points in each bin is plotted in a polar plot of elevation and azimuth for each of the stations

Apeldoorn (APEL) TRIMBLE 4700 TRM29659.00 UNAV	Delft (DELF) TRIMBLE 4700 TRM29659.00 UNAV	Eijsden (EIJS) TRIMBLE 4700 TRM29659.00 UNAV
Terschelling (TERS) TRIMBLE 4700 TRM29659.00 UNAV	Borkum (BORK) TRIMBLE 4000SSI TRM29659.00 SNOW	Zimmerwald (ZIMM) TRIMBLE 4000SSI TRM29659.00 NONE
Kootwijk AGRS (KOSA) TRIMBLE 4700 AOAD/M_B DUTD	Kootwijk IGS (KOSG) ROGUE SNR-12 RM AOAD/M_B DUTD	Onsala (ONSA) ASHTECH Z-XII3 AOAD/M_B OSOD
Westerbork AGRS (WSRA) TRIMBLE 4700 AOAD/M_T DUTD	Westerbork IGS (WSRT) AOA SNR-12 ACT AOAD/M_T DUTD	Potsdam (POTS) AOA SNR8000 ACT AOAD/M_T NONE
Wettzell (WTZR) AOA SNR8000 ACT AOAD/M_T NONE	Brussel (BRUS) ASHTECH UZ-12 ASH701945B_M NONE	Helgoland (HELG) ASHTECH Z-XII3 ASH700936D_M SNOW
Herstmonceux (HERS) ASHTECH Z-XII3 ASH700936E NONE	Euskirchen (EUSK) TRIMBLE 4000SSI TRM22020.00+GP

The following can be concluded from these results

• The satellite tracks repeat themselves every day, making the sampling over the sky not very uniform
• The maps of the mean residuals and standard deviation of residuals are both "filled-in" using interpolation to the nearest data-points to give them a more visual appearance.
• Note that the interpolated data-points are never used for generating multipath corrections
• Several structures in the mean residuals maps are perpendicular to the tracks
• There are significanly fewer observation for Borkum, because this station became on-line somewhere in the middle of this period