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??? ?? ?·? ?? ??? ????? ??? ??? ????.
?? ??????? 7? ‘??? ????? ????? ????? ????’?? ??? ???? “???? ???? ?? ??? ????? ??? ????? ?????? ???? ?? ??? ???? ??”?? “??? ??? ??? ???? ??? ????? ??? ??? ??”? ????.
??? “? ????? ???? ???? ?? ??? ??? ???? ???? ????? ????? ????? ??? ????? ?? ??? ??? ??”? ????.
??? “? ???? ? ?? ??? ???? ??? ????? ??? ??? ???? ??? ? ?? ??? ?? ???? ???? ?????? ?? ??? ???? ??? ??? ????”? ????.
??? ???? “??? ????? ?? ????? ????? ????”? “??? ??? ??? ???? ??? ??? ????? ??? ????? ? ??? ???? ? ?”??? ????.
??? 29? ?? ????? ????? ?????? ?? ????? ????. ? ??? ?·? ?? ?(光) ??? ????(DRS)??. ? ??? ??? ???(?? 200~2000㎞)? ???? ??????(IGS)? ??????(ALOS)? ???? ??? ????. ??? ??? ??? ?? ??? ????? ?? ???.
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