▁individual , ▁who ▁was ▁sent ▁out ▁throughout ▁the ▁provinces ▁to ▁collect ▁texts ▁and ▁as ▁much ▁data ▁as ▁possible . ▁With ▁the ▁aid ▁of ▁Song ▁Zh un , ▁the ▁massive ▁work ▁was ▁completed ▁in ▁ 1 0 1 0 , ▁with ▁some ▁ 1 5 6 6 ▁chap ters . ▁The ▁later ▁Song ▁Sh i ▁historical ▁text ▁stated ▁( W ade - G iles ▁sp elling ): ▁ ▁Like ▁the ▁earlier ▁Li ang ▁D ynast y ▁stone - ste le ▁maps ▁( ment ioned ▁above ), ▁there ▁were ▁large ▁and ▁intr ic ately ▁car ved ▁stone ▁ste le ▁maps ▁of ▁the ▁Song ▁period . ▁For ▁example , ▁the ▁ ▁squ ared ▁stone ▁ste le ▁map ▁of ▁an ▁anonymous ▁artist ▁in ▁ 1 1 3 7 , ▁following ▁the ▁grid ▁scale ▁of ▁ 1 0 0 ▁li ▁squ ared ▁for ▁each ▁grid ▁square . ▁What ▁is ▁truly ▁remarkable ▁about ▁this ▁map ▁is ▁the ▁incred ibly ▁precise ▁detail ▁of ▁coast al ▁out lines ▁and ▁river ▁systems ▁in ▁China ▁( refer ▁to ▁Need ham ' s ▁Volume ▁ 3 , ▁Pl ate ▁L XXX I ▁for ▁an ▁image ). ▁The ▁map ▁shows ▁ 5 0 0 ▁settlement s ▁and ▁a ▁dozen ▁rivers ▁in ▁China , ▁and ▁extends ▁as ▁far ▁as ▁Korea ▁and ▁India . ▁On ▁the ▁reverse , ▁a ▁copy ▁of ▁a ▁more ▁ancient ▁map ▁uses ▁grid ▁coordinates ▁in ▁a ▁scale ▁of ▁ 1 : 1 , 5 0 0 , 0 0 0 ▁and ▁shows ▁the ▁coast line ▁of ▁China ▁with ▁great ▁accuracy . ▁ ▁The