topic Re: How to check if a location(latitude, longitude) in a map area(district/city/province)? in SAS Procedures

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

kimmygzc — Thu, 14 Apr 2022 08:35:48 GMT

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!

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

JosvanderVelden — Thu, 14 Apr 2022 10:05:06 GMT

See the answers in this thread: https://communities.sas.com/t5/Graphics-Programming/Is-there-a-way-to-Reverse-Geocode-Take-Lat-Long-and-convert-to/td-p/197535

You can also investigate other options such as for instance: https://www.maptiler.com/cloud/geocoding/

Best regards, Jos

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

ballardw — Thu, 14 Apr 2022 10:33:56 GMT

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.

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

sbxkoenk — Thu, 14 Apr 2022 10:37:38 GMT

https://go.documentation.sas.com/doc/en/pgmmvacdc/9.4/grmapref/n1em0w0lpfi8qdn1jhervlg4lsyw.htm

Koen