title: 3d plot to access distribution of variables in space
body: <p>I want to generate a plot in which I'm capable of visualising the distribution of a given variable in space. </p>
  
  <p>Let's say I want to know how the values of frequency bandwidth (Hz) of a bird's song are spread in space.</p>
  
  <p>I tried with <code>scatterplot3d</code>. But I'm think this is not right.</p>
  
  <pre><code>x&lt;-a vector with easting coordinates
  y&lt;-a vector with northing coordinates
  z&lt;-a vector with the bandwidth values (in Hz)
  </code></pre>
  
  <p>Then I do:</p>
  
  <pre><code>scatterplot3d(x,y,z)
  </code></pre>
  
  <p>Should "z" be a coordinate or can I use it as a vector of values of a given variable?</p>
  
  <p>Thanks in advance!</p>