My idea is that, because of the lack of traffic network information, so can't use arcgis to do two steps mobile search to calculate the settlement to some hospital traffic travel time, so I hope this part of the work done by baidu map API,
Now some data:
1. Address and latitude and longitude of each hospital (hospital had 45, baidu map coordinates format)
2. The settlement data (from the world health organization (who) download above, is 100 * 100 m raster data, containing the population and the location of the information, the form of the location information is WGS84) because computing is a province of the people, so the amount of calculation is a bit big

From classmates before finding his work for the same type when writing code, but I didn't study, pure code really idiot, now is not very understanding, so to ask people how to I realize my idea, thank you bosses!