沒文化的用GIS做個地圖都丟三落四的。 數字是啥意思？ populaiton count or

population density? what is the enunmeration unit (county? zip code? ) what data classification method? Obviously, it is not equal interval. Is it quantile? standard devision? mantual interval? geometric interval? natual break?   這些信息， 地圖上本該明確表明的。