( ( ( ( ( ( ( The ( Earth 's ) ) surface ) ( can ( ( be ( observed ( from ( space ( ( much ( more ( ( effectively and ) accurately ) ) ) ( using satellites ) ) ) ) ) ) ( than ( it ( can ( from ( ( the ground ) ( by humans ) ) ) ) ) ) ) ) ) , ) and ) ( ( remote sensing ) ( has ( become ( ( a ( major source ) ) ( of ( ( the information ) ( that ( is ( ( used ( by ( researchers ( , ( companies ( , ( and agencies ) ) ) ) ) ) ) ( to ( produce maps ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN Earth) (POS 's)) (NN surface)) (VP (MD can) (VP (VB be) (ADJP (JJ observed) (PP (IN from) (NP (NP (NN space)) (VP (ADVP (RB much) (RBR more) (RB effectively) (CC and) (RB accurately)) (VBG using) (NP (NNS satellites)))))) (SBAR (IN than) (S (NP (PRP it)) (VP (MD can) (PP (IN from) (NP (NP (DT the) (NN ground)) (PP (IN by) (NP (NNS humans))))))))))) (, ,) (CC and) (S (NP (JJ remote) (NNS sensing)) (VP (VBZ has) (VP (VBN become) (NP (NP (DT a) (JJ major) (NN source)) (PP (IN of) (NP (NP (DT the) (NN information)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN used) (PP (IN by) (NP (NNS researchers) (, ,) (NNS companies) (, ,) (CC and) (NNS agencies))) (S (VP (TO to) (VP (VB produce) (NP (NNS maps))))))))))))))) (. .)))
The Earth's surface can be observed from space much more effectively and accurately using satellites than it can from the ground by humans, and remote sensing has become a major source of the information that is used by researchers, companies, and agencies to produce maps.
(ROOT (S (NP (NNS Satellites)) (VP (VBP are) (NP (NP (JJ man-made) (NNS devices)) (PP (IN in) (NP (NN space))) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB observe) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface))))))))))) (. .)))