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| Current Status | Time, #Stations | Interactive Display | TPW maps Interpolation |
TPW maps NOAA color |
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Current # of stations > Detailed Status |
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| Verification | Comparison RAOB and SUOMINET |
O-B GFS 12hr fct |
System Info. | Flow & Data |
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| Date | Time | Actions |
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Problem Data Quality Data Missing > 6 hours <= 6 hours Current Problem Updates Improvement
| Date | Problems and Actions | Fixed / Links |
|---|---|---|
| March 26, 2018 ( Potential Problem ) |
No METARS Data : Missing periods for TPW products are expected because of missing METARS data. |  |
| March 13, 2018 |
Web site for GPS Solutions have been updated. | |
| October 7-10, 2017 ( Potential Problem ) |
Scheduled Maintenance in NOAA Servers : Some missing periods are expected in case of the problems in delivery of METARS data. |  |
| October 5, 2017 |
Missing of GPS-MET products for three-four hours: No GNSS products were not availble from around 06UTC for 3-4 hours because of upgrade of hosting service. | The problem was fixed by setting optional hosting service. |
| October 3, 2017 |
Missing of GPS-MET products for one-two hours because of no METARS data: No GNSS products were not availble because of no surafce meteorological observation data from NOAA AWC (All of metars csv files are empty only with header in AWC) | METARS data has been abailble since around 19:20UTC, and GPS-MET system has delivered the products. |
| Septeber 2-5, 2017 | Some Raw Data Missing: No GNSS data were available from NOAA NGS CORS network (about 700 - 800 stations). GPS-MET system tries to download GNSS data for four times, but no data was available for about 3 days over Labor Day weekend. GPS-MET system was woring with data from other data providers (UNAVCO, SOPAC, TX DOT, ...) in the periods. | Raw data in FTP site in NOAA NGS CORS has been available from 14UTC, Sep. 5 |
| July, 2017 | General: Statistics of GPS-TPW minus RAOB-TPW is updated (July, 2017).
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Link |
| July 13, 2017 | Product missing for a few hours:
Products were not available for the period 11-15 UTC, July 13, 2017 because of temporal system problem in data server. The problem has been fixed after system oprator got error message from the system. |
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| July 1-5, 2017 | Some Raw Data Missing: No GNSS data were available from NOAA NGS CORS network (about 700 - 800 stations). GPS-MET system tries to download GNSS data for four times, but no data was available for about 4.5 days. GPS-MET system was woring with data from other data providers (UNAVCO, SOPAC, TX DOT, ...) in the periods. | Report |
| June, 2017 | General: Statistics of GPS-TPW minus RAOB-TPW is updated (June, 2017). Eleven USCG stations started sending GPS data from late in June. |
Link |
| May, 2017 | General: Statistics of GPS-TPW minus RAOB-TPW is updated (May, 2017). |
Link |
| April 18-21, 2017 |
Problem: GPS-TPW showed dry bias Reason: It was caused because GPS-MET system used one incomplete Veripos satellite products (because of system update) with missing of orbit and clocks (only header). The monitoring program prepared on the April 5 action thought the files existed there, and no alert were sent. New GPS-MET processing system (RTNet) were available at that time, but it was still used for comparison purpose (parallel processing). That caused generation of biased GPS TPW products, again, during the second problematic period (April 18-21). Updates: (1) New program which pickup optimal Veripos satellite products were made, and it now choose complete products for GPS-MET processing. (2) One more operational Veripos system as additional source of GPS orbit/clock products. (3) RTNet software was switched to the latest one (which had been tested in parallel processing) on April 21. The new RTnet uses better approach than that in the action (3) (Add more statistical noise (sigma) to the ZTD estimate). The new RTNet doesn't output any ZTD solutions when GPS orbit/clock products are not available. With these updates, TPW products will not be generated and sent in the case of no Veripos satellite products problems on April 5 and April 18-21. |
April 21, 2017 |
| April 5, 2017 |
Problem: GPS-TPW showed dry bias Reason: Someone removed the file needed to authorize copying via "rsync" in primary Veripos data server. GPS-MET system continued to output ZTD estimate for the last epoch before missing of Veripos satellite products. This is the first event of missing of Veripos products since October 27, 2016. Updates: (1) Two more independent system are used to download Veripos satellite products. (2) Send notification in case of missing Veripos satellite products to monitor that the redundant systems are working correctly. (3) Add more statistical noise (sigma) to the ZTD estimate in our internal ZTD output during periods when GPS orbit/clock are missing. Should the noise in the ZTD estimate exceed a set threshold the GPS-MET QC system automatically rejects biased ZTD data based on the noise level. (4) TPW data are compared to NCEP GFS internally in addition to radiosonde TPW. |
April 5, 2017 |
| October 27, 2016 |
Update: Change of satellite products from regional to Veripos global Reason: Because ZTD estimate with regional satellite clock products are noisy in the stations (e.g. Hawaii) far from the server network used for satellite clock estimation, satellite clock are updated to Veripos global products updated every 60 minutes. Improvement: (1) ZTD and TPW products are improved (better agreement with RAOB TPW in Hawaii stations). (2) No more dependency on unstable FTP data download from free GPS data. | -- |
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