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????7??31????? (??????? ???????)31??,?????±800????(?:??±800????????????????)??????,?????????500????????????GIS??,???????????±800??????????????????????

??,????±800?????“??????”??,?????????????????±800??,????????????????????????????????5??,?????????????????±800???????,???2290???????,??????800??????6??????,??????400????“????????????????”?????

??±800???????,???????60?,??????????????????????????,????360???????????,????,???????±800???????1020?????,??50%,???600?????,??????????????1650??,???????????(????) ??????:???????????????