title: R latitude longitude visualization
body: <p>I'm trying to make a visualization of latitude and longitude values. Thanks to another <a href="https://stackoverflow.com/questions/42462677/r-plot-latitude-and-longitude?noredirect=1#comment72067716_42462677">post</a> I managed to get the right values to be passed to ggplot. The code I'm using is as follows:</p>
  
  <pre><code>tweets &lt;- searchTwitter('weather', n=1000,lang='en')
  t &lt;- twListToDF(tweets)
  lat &lt;- t[, c("latitude")]
  lon &lt;- t[, c("longitude")]
  l.df &lt;- data.frame(lat,lon)
  l.df &lt;- na.omit(l.df)
  require(ggplot2)
  ggplot(l.df, aes(x=l.df$lon, y=l.df$lat,)) + geom_point(size=10.9, alpha=.02)
  </code></pre>
  
  <p>The problem is that I'm getting a nearly empty plot. I'm saying nearly empty as there are some spots but are difficult to identify</p>
  
  <p>How can I get a plot to display the map of the world and dots for the geo-location?</p>
  
  <p><a href="https://i.stack.imgur.com/Zb4Xn.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Zb4Xn.jpg" alt="enter image description here"></a></p>