查找每个点坐标属于哪个国家 [英] Find in which country each point-coordinate belongs to

问题描述

我有一个经纬度坐标的数据框:

I have a data frame with lat/lon coordinates:

head(COORD)
   LAT   LON 
1  69.34 16.17  
2  69.20 17.92   
3  69.59 17.87 
4  69.17 18.52  
5  69.42 18.95 
6  69.22 18.91 

我想检索每个点的国家/地区名称并将其添加为第三列. 也许结合使用which和map来检索点在哪个多边形中，但是我无法弄清楚该怎么做.

I would like to to retrieve the country name of each point and add it as a third column. Maybe using which in combination with map to retrieve in which polygon the points are but I was not able to figure out how.

推荐答案

尝试使用map.where()

Try using map.where()

library(maps)

COORD$Country <- map.where(database="world", COORD$LON, COORD$LAT)

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