我想把地级市的人口信息画在地图上。我参考http://www.stata.com/support/faqs/graphics/spmap-and-maps/ 上的例子,在国家基础地理信息系统网站下载了地图数据,然后画出了一只抽象派的公鸡,我的code问题在哪呢?
shp2dta using res2_4m, database(china_city_db) coordinates(china_city_coord) genid(id) replace
use "china_city_db.dta", clear
gen city_id=int(ADCODE99/100)
replace city_id=1100 if city_id==1101
replace city_id=1200 if city_id==1201
replace city_id=3101 if city_id==3100
replace city_id=3100 if city_id==3101
replace city_id=5000 if city_id==5001
merge m:1 city_id using yearbook2000.dta
drop if _merge != 3
spmap pop using "china_city_coord.dta",id(id)