title: geom_text not working when ggmap and geom_point used
body: <p>HI I am using ggmap and gg_point function to show the measured data in an estuary. </p>
  
  <p>The code that I used is as follows:</p>
  
  <blockquote>
  <pre><code>    library(ggmap)
  al1 &lt;- get_map(location = c(lon = -87.525, lat = 30.35), zoom = 12, maptype = 'terrain')
  
  lon&lt;- c(-87.604474,-87.55)
  lat&lt;- c(30.362563,30.35)
  label &lt;- c("A","B")
  df&lt;-data.frame(lon,lat,label)
  
  p &lt;- ggmap(al1)+geom_point(data=df,aes(x=lon,y=lat,shape=label,label=label),size=3)
  p &lt;- p + xlab("Longitude")+ylab("Latitude")
  p &lt;- p +geom_text(aes(label=label, size=3,vjust=0))
  p &lt;- p + labs(title="Monitoring stations ")
  p
  
  ggsave("plot.pdf")
  </code></pre>
  </blockquote>
  
  <p>Here when I use geom_text then I get the following error, "Aesthetics must either be length one, or the same length as the dataProblems:label". </p>
  
  <p>I want to place the label next to the points in the plot. I would like to place both points and label and with some spacing so that it would be easier to read. </p>
  
  <p>I looked at this post "<a href="https://stackoverflow.com/questions/4221168/ggplot-legend-issue-w-geom-point-and-geom-text">ggplot legend issue w/ geom_point and geom_text</a>" and tried to fix my code as you can see above but I don't know why I am having this issue. </p>
  
  <p>There is another post <a href="https://stackoverflow.com/questions/7578536/how-can-i-persuade-ggplot2-geom-text-to-label-a-specified-date-in-a-time-series">How can I persuade ggplot2 geom_text to label a specified date in a time series plot?</a> which talks the similar questions. Am I getting different results because I am using ggmap also ? </p>
  
  <p>Please help me to solve this problem. Thank you so much. </p>
  
  <p>Jdbaba</p>