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kimmygzc
Obsidian | Level 7

How to check if a location(latitude, longitude) in a map area(district/city/province)?

 

Have mapsgfk.china

 

input (lat, long)

 

want city name

 

Since proc gmap choro illustrates the map with color pretty nice, I guess there's a way to check if a point is in that color set, which refers to an area.

 

Thanks in advance! 

3 REPLIES 3
ballardw
Super User

Easy : check if a point is inside map region (district/province/whatever) when you have a point coordinates in the same coordinate system the map uses and the boundaries of the area are in the map: Proc Ginside.

 

Since that map set you reference does not have anything I recognize as a city then it doesn't really help much if that is what you want.

 

If you have a source of city point coordinates you might investigate find the minimum distance to cities using the GEODIST function. This topic has also been discussed on the forum a few times.

 

 

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