GNSS RO data are mainly processed by using the techniques from CDAAC and ROMSAF. For technological independence, NCU/GPSARC developed a 1DVAR RO data retrieval system, which retrieves the FORMOSAT-7 RO refractivity to obtain atmospheric temperature and moisture profiles. The high vertical resolution atmospheric soundings are comparable with radiosondes. The system is one of the components of TROPS, and it is operationally performed by CWB TACC. From our analysis in Chen et al. (2021), most of the FS7 RO data can reach the lower troposphere. Because of rare observations over the ocean, the RO data could provide near-real-time environmental monitoring.
Early awareness of tropical cyclogenesis will be helpful for disaster prevention. Based on Chen et al. (2020), we further apply the nonlocal RO operator with FS7 RO data in the advanced hybrid data assimilation system for the detection of tropical cyclogenesis. The processing system and detection platform have been implemented at GPSARC.

The independent development of RO data processing can effectively master the key technology. The high-resolution temperature and humidity obtained from FS7 can also provide real-time atmospheric environmental monitoring.
Relying on the advantages of the advanced nonlocal operator and hybrid data assimilation, we combine both parties to simulate the tropical cyclogenesis. The technique provides a new aspect of RO application and can also be used as an early warning of severe weather reference.

The establishment and operation of FS7 RO data processing can provide real-time RO products for weather-related industries. The RO data assimilation technique can be used as a research tool for the academic and be taken as preliminary development technology for meteorological related units. It could be applied to the operation in the future. On the other hand, the simulation of cyclogenesis by RO data assimilation can be taken as additional references for weather forecasting and air and sea transportations. It is also a new aspect of the industrial application of RO data.

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