Link: สำนักงานพัฒนาเทค นโลยี[at]วกาศและ[at]ูมิสารสนเทศ ([at]งค์การมหาชน)
Seems they do keep it updated
From a link at the site above (ASIA: How space technology aids a flood response)
Thailand is using the data to determine which households should receive flood victims assistance, said Paranat Kerdpol, a spokeswoman for GISTDA, which is operating the satellite "war room" in Bangkok.
Images from low-earth orbit satellites capture higher-resolution images from about 500-800km away, and are used in combination with higher-level satellites that capture larger swathes of land. Satellites with radar sensors are used to penetrate cloud coverage.
Predicting floods with satellite information is a bit trickier, Williams said. It requires an analysis of topography, flood control systems such as dykes, river basins, and river characteristics.
"Even if you can predict it," Williams said, "do you have the capacity to act and mitigate it?"