I am trying to plot a geometric point on Vietnam map. However, I can not do it.
I download the level 1 sp map from GADM. Then I try to coordinate the place with the longitude and latitude. Finally, I try to use geom_point to plot the place but it's not happened. Below is my code
without having your map data, I notice that you are "mixing" base R plot with ggplot::geom_point - that might be the issue. Also, could you provide the error message you are getting? For plotting maps with ggplot there are many resources among others https://www.r-spatial.org/r/2018/10/25/ggplot2-sf.html
It will help you to get answers to your R questions if you can learn to make a reprex.
A reprex is a reproducible example. This is a nice guide to making your own reprex. This will help you for future questions.
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