THEOS, also known as Thaichote,[2][3] is an Earth observation mission of Thailand, developed at EADS Astrium SAS, Toulouse, France.

In July 2004, EADS Astrium SAS signed a contract for delivery of THEOS with GISTDA (Geo-Informatics and Space Technology Development Agency) of Bangkok, Thailand.

[4] On 24 March 2014, THEOS captured images showing some 300 objects in close proximity to the suspected crash site of Malaysia Airlines Flight MH370, in the Indian Ocean.

THEOS was used to observe natural resources in the country by gathering information to be used by both the government and public for research and mapping.

THEOS observation missions are conducted to observe agriculture sites, the production of agricultural crops, forest demolition, forest types, shrimp farms, water pollution from oil leaks, water sources, community areas, illegal farms, disaster areas, and the satellite can also be used for city planning.