public ImageWarp(BufferedImage bi){
  this(bi,LatLonGCT.INSTANCE,new DataBounds(-180.0,-90.0,180.0,90.0));
}

public ImageWarp ( BufferedImage bi ) { this ( bi , LatLonGCT . INSTANCE , new DataBounds ( - 180.0 , - 90.0 , 180.0 , 90.0 ) ) ; }
create an image warp for an image assumed to be world wide coverage , with the top at 90 degrees , the bottom at - 90 , the left side at - 180 and the right side at 180 . assumes the origin point is in the middle of the image .
