The islands' names refer to the different force winds hitting them, not their topography.
( ( ( The ( islands ' ) ) names ) ( ( refer ( to ( ( the ( different ( force winds ) ) ) ( hitting ( ( ( them , ) not ) ( their topography ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS islands) (POS ')) (NNS names)) (VP (VBP refer) (PP (TO to) (NP (NP (DT the) (JJ different) (NN force) (NNS winds)) (VP (VBG hitting) (NP (NP (PRP them)) (, ,) (RB not) (NP (PRP$ their) (NN topography))))))) (. .)))
The name of the islands are based on their topography.
( ( ( The name ) ( of ( the islands ) ) ) ( ( are ( based ( on ( their topography ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN name)) (PP (IN of) (NP (DT the) (NNS islands)))) (VP (VBP are) (VP (VBN based) (PP (IN on) (NP (PRP$ their) (NN topography))))) (. .)))