Hence, the term isogloss , from iso - `same' + gloss `word,' to describe the line on a map where the terms are of equal distribution.
( Hence ( , ( ( the term ) ( ( ( ( isogloss , ) ( from ( ( iso - ) ( ` ( same ( ' + ) ) ) ) ) ) ( ( ( ( ( gloss ` ) word ) , ) ' ) ( to ( ( ( describe ( the line ) ) ( on ( a map ) ) ) ( where ( ( the terms ) ( are ( of ( equal distribution ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Hence)) (, ,) (NP (DT the) (NN term)) (VP (VBZ isogloss) (, ,) (PP (IN from) (NP (NP (NN iso)) (: -) (NP (`` `) (JJ same) ('' ') (NNS +)))) (VP (VB gloss) (`` `) (NP (NN word)) (, ,) ('' ') (S (VP (TO to) (VP (VB describe) (NP (DT the) (NN line)) (PP (IN on) (NP (DT a) (NN map))) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NNS terms)) (VP (VBP are) (PP (IN of) (NP (JJ equal) (NN distribution))))))))))) (. .)))
An isogloss has nothing to do with maps. 
( ( An isogloss ) ( ( has ( nothing ( to ( do ( with maps ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NNS isogloss)) (VP (VBZ has) (NP (NN nothing) (S (VP (TO to) (VP (VB do) (PP (IN with) (NP (NNS maps)))))))) (. .)))