Hi group,
I printed

hdf <- get_map(location = c(19.817955, 41.33071), zoom = 14, maptype =
'roadmap')

> ggmap(hdf, extent = 'normal', maprange = TRUE) +
+     geom_point(aes(colour = class), data = chkpts) +
+     theme_nothing() + theme(legend.position = 'right')

where data = chkpts is like this:

lonlatclass119.8311941.336951219.8338341.330531319.8337841.333021419.83119
41.336951519.8311941.336951


How can I add a description for one point of this.
I tried to modify the example:

ggmap(baylor) + theme_bw() +
  annotate('rect', xmin=-97.11920, ymin=31.5439, xmax=-97.101, ymax=31.5452,
    fill = I('black'), alpha = I(3/4)) +
  annotate('segment', x=-97.110, xend=-97.11920, y=31.5450, yend=31.5482,
    colour=I('red'), arrow = arrow(length=unit(0.3,"cm")), size = 1.5) +
  annotate('text', x=-97.110, y=31.5445, label = 'Department of Statistical
Science',
    colour = I('red'), size = 6) +
  labs(x = 'Longitude', y = 'Latitude') + ggtitle('Baylor University')


but unsuccessfully.

Please help

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