Abstract
This paper describes of an introduction to the "Special Issue on Radio Wave and Remote Sensing". Sensing with microwave is superior to with optical wave as all weather sensor. The penetrability of microwave to opaque weather such as cloud and rain has been proved by SEASAT and other Satel-lites. The subsurface radar has successed to probe objects buried in deep underground. Japanese Satellite implemented microve sensors i.e. MOS-1 MSR and JERS-1 SAR, and planning TRMM and ADEOS are also introduced in this Special Issue.
