Each graph shows, for each observation time H ([H-3h00,H+3h00[ for long cut-off
analysis), daily evolution of Zenithal Total Delay (or Atmopsheric Path Delay)
observations monitoring from all ground GPS stations. Daily statistics are calculated,
on all GPS producer centers or for each GPS producer center which are only used in NWP
analysis. On these graphs are plotted :
- number of observed data (yellow), number of
rejected data (blue) and number of gross errors (red)
- mean and standard-deviation curves of the deviations from first
guess before and after bias correction
Bias correction is aplied for 16 GPS producer centers : LPT, LPTR, METO, METG, GFZ, GOP1, GOPG, ASI, ROBH, KNM3, KNM4, BKG, SGN, SGN1, NOAA and IGE.
ZTD observations from these GPS centers are used in NWP analysis. Observations from other centers are blacklisted and no bias correction is applied.
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