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並前往https://www.earthdatascience.org/courses/earth-analytics/spatial-data-r/make-maps-with-ggplot-in-R/

Maps in R: R Maps Tutorial Using Ggplot | Earth Data Science

plot roads by attribute ggplot() + geom_path(data = sjer_roads_df, aes(x = long, y = lat, group = group, color = factor(RTTYP))) + ...

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