▁' B a ▁June ▁Tu ▁J ing ' ▁(' Map ▁of ▁S zech uan '), ▁which ▁had ▁been ▁made ▁much ▁earlier ▁in ▁ 1 5 0 . ▁ ▁Local ▁map making ▁such ▁as ▁the ▁one ▁of ▁S ich uan ▁mentioned ▁above , ▁became ▁a ▁w ides p read ▁tradition ▁of ▁Chinese ▁ge ographical ▁works ▁by ▁the ▁ 6 th ▁century , ▁as ▁noted ▁in ▁the ▁bibli ography ▁of ▁the ▁S ui ▁Sh u . ▁It ▁is ▁during ▁this ▁time ▁of ▁the ▁Southern ▁and ▁Northern ▁D ynast ies ▁that ▁the ▁Li ang ▁D ynast y ▁( 5 0 2 – 5 5 7 ) ▁cart ograph ers ▁also ▁began ▁car ving ▁maps ▁into ▁stone ▁st eles ▁( al ong side ▁the ▁maps ▁already ▁drawn ▁and ▁painted ▁on ▁paper ▁and ▁sil k ). ▁ ▁Pe i ▁X iu , ▁the ▁' P to le my ▁of ▁China ' ▁In ▁the ▁year ▁ 2 6 7 , ▁Pe i ▁X iu ▁( 2 2 4 – 2 7 1 ) ▁was ▁appointed ▁as ▁the ▁Minister ▁of ▁Works ▁by ▁Emperor ▁Wu ▁of ▁Jin , ▁the ▁first ▁em peror ▁of ▁the ▁Jin ▁D ynast y . ▁Pe i ▁is ▁best ▁known ▁for ▁his ▁work ▁in ▁cart ography . ▁Although ▁map ▁making ▁and ▁use ▁of ▁the ▁grid ▁existed ▁in ▁China ▁before ▁him , ▁he ▁was ▁the ▁first ▁to ▁mention ▁a ▁pl otted ▁geomet rical ▁grid ▁and ▁graduated ▁scale ▁displayed ▁on ▁the ▁surface ▁of ▁maps ▁to ▁gain ▁greater ▁accuracy ▁in ▁the ▁estimated ▁distance ▁between ▁different ▁locations . ▁Pe i ▁out