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Satellite data, mostly optical sensors are successfully used in agriculture for some time in Asia. However, the presence of cloud cover limits the practical use of optical sensors in the tropics. This chapter discusses the use of Synthetic Aperture Radar (SAR) data which can penetrate through clouds for rice crop monitoring. We highlight two important collaborative regional initiatives: Asia-RiCE and Space Applications for Environment (SAFE) of the Asia Pacific Regional Space Agency Forum (APRSAF). The initiatives are based on activities carried out in Cambodia, Indonesia, Thailand, and Vietnam using L-band (ALOS-2) and C-band SAR (Sentinel-1) satellites with available rice crop maps by optical sensors reference. National agencies required reliable and timely methods for mapping rice fields and rice phenology and finally relating to rice production to support national food security programs. Summary …