Читать книгу Global Drought and Flood - Группа авторов - Страница 40

In this chapter we briefly reviewed the history of studies of estimating land surface evapotranspiration at local to global scales using remote sensing approaches. The thermal remote sensing approach using the ALEXI model is categorized as probably one of the most reliable. Based on the ALEXI model the GET‐D product system using GOES‐13 and GOES‐15 observations has been developed and made operational at the NESDIS of NOAA. Upgrading the GET‐D system to use the most recently installed GOES‐16 and GOES‐17 observations is ongoing. For global remote sensing of ET and monitoring of drought based on ET estimates, the ALEXI model using the thermal observations from NOAA operational observations of VIIRS onboard the Suomi National Polar‐orbiting Partnership and Joint Polar Satellite System satellites has been demonstrated to be promising (Hain et al., 2017). More intercomparison and validation studies using approaches based on the ALEXI model, the PM equation, the PT equation, and other methods for globally estimating and monitoring drought are needed.