title: Projecting a SpatialLines object from lat/lon to utm
body: <p>I created a great-circle trajectory of lat/lon using the <code>geosphere</code> package:</p>
  
  <pre><code>flightTraj  = greatCircle( c( originAptLon, originAptLat ), c( destinAptLon, destinAptLat ), n = nPts, sp = TRUE )
  </code></pre>
  
  <p>Its properties are:</p>
  
  <pre><code>class       : SpatialLines 
  features    : 1 
  extent      : -180, 180, -52.74719, 52.74719  (xmin, xmax, ymin, ymax)
  coord. ref. : +proj=longlat +ellps=WGS84 
  </code></pre>
  
  <p>I want to project to a UTM zone 14 cartography with WGS84 ellipsoid.  I tried:</p>
  
  <pre><code>projectedTrajectories  &lt;- CRS("+proj=utm +zone=14 +datum=WGS84 +units=km +no_defs") %&gt;% 
      spTransform( flightTraj, . )
  </code></pre>
  
  <p>But, the console displayed:</p>
  
  <pre><code>non finite transformation detected:
    V1 lat  
    Error in .spTransform_Line(input[[i]], to_args = to_args, from_args = from_args,  : 
    failure in Lines 1 Line 1 points 
    In addition: Warning message:
    In .spTransform_Line(input[[i]], to_args = to_args, from_args =     from_args,  :
    6 projected point(s) not finite
  </code></pre>
  
  <p>Any help, please.</p>