( ( ( ( ( ( ( The ( vertical ( angular ( response functions ) ) ) ) ( of ( most ( current ( meter ( and ( anemometer sensors ) ) ) ) ) ) ) ( are known ) ) , ) and ) ( ( ( the accuracy ) ( of ( the ( measured ( horizontal flow ) ) ) ) ) ( ( can further ) ( be ( improved ( by ( correcting ( for ( ( the tilt ) ( of ( the instruments ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (JJ vertical) (NN angular) (NN response) (NNS functions)) (PP (IN of) (NP (RBS most) (JJ current) (NN meter) (CC and) (NN anemometer) (NNS sensors)))) (VP (VBP are) (VP (VBN known)))) (, ,) (CC and) (S (NP (NP (DT the) (NN accuracy)) (PP (IN of) (NP (DT the) (JJ measured) (JJ horizontal) (NN flow)))) (VP (MD can) (ADVP (RBR further)) (VP (VB be) (VP (VBN improved) (PP (IN by) (S (VP (VBG correcting) (PP (IN for) (NP (NP (DT the) (NN tilt)) (PP (IN of) (NP (DT the) (NNS instruments)))))))))))) (. .)))
The vertical angular response functions of most current meter and anemometer sensors are known, and the accuracy of the measured horizontal flow can further be improved by correcting for the tilt of the instruments.
(ROOT (S (NP (NP (NNP Instruments)) (SBAR (WHNP (WDT that)) (S (VP (VB measure) (NP (NP (DT the) (NN angle)) (PP (IN of) (NP (NP (DT the) (NN slope)) (PP (IN of) (NP (DT a) (NN volcano)))))))))) (VP (VBP are) (VP (VBN called) (NP (NN tilt) (NNS meters)))) (. .)))