[IGSMAIL-8534] Transition from FTP to HTTPS Protocol for CAS Data Center

[wangningbo at aoe.ac.cn]

Author: Ningbo WANG (AIR/CAS)

Dear colleagues,

We would like to inform you of an important update regarding our data center transition at the Chinese Academy of Sciences (CAS). Over the past two months, we have successfully migrated from supporting FTP to HTTPS protocol for data distribution.

Previously, CAS multi-GNSS Differential Code Bias (DCB) and Global Ionospheric Map (GIM) products were publicly available on our FTP server at ftp://ftp.gipp.org.cn and were transferred to IGS Data Centers including IGN, BKG, and CDDIS.

As part of this transition, we are now using a new HTTPS server, which can be accessed at the following URL:
https://data.bdsmart.cn/pub/

This new data center hosts CAS-generated multi-GNSS DCB, global TEC maps, as well as real-time GNSS SSR data. All SSR data have been converted into standardized formats for post-processing analysis, ensuring compliance with IGS product specifications as wel as long file naming conventions.

Here is a quick overview of the available product subdirectories on the new server:

./product/bias/ CAS multi-GNSS DCB products (CAS0MGXRAP* & CAS1MGXRAP*)
./product/iono/ionex/ CAS rapid and final GIM products (CAS0OPSFIN* & CAS0OPSRAP*)
./product/rts/iono/ CAS RT-VTEC maps and combined RT-VTEC maps (CAS1OPSRTS* & IGS1OPSRTS*)
./product/rts/rtpp/ CAS real-time orbit and clock products in SP3 and CLK formats
./product/rts/brdc/ CAS combined real-time broadcast ephemeris data
...
Please note that the old FTP server (ftp://gipp.org.ac.cn) will be shut down by March 1, 2025. We strongly encourage all users to adapt their software to the new HTTPS link (https://data.bdsmart.cn/pub/) for data downloads as soon as possible.

If you encounter any issues or have any suggestions, please feel free to reach out to me via email at wangningbo at aoe.ac.cn

In addition to the new data center, CAS regional caster is now operational for IGS real-time data stream distribution via https://igs.bdsmart.cn/. For more details, please refer to the communication sent to the IGS Real-Time Committee via #IGS-RTWG-358.

Thank you for your attention to this update.

Best regards,
Ningbo Wang
On behalf of CAS Team
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