cdm/src/main/java/ucar/unidata/geoloc/projection/sat/MSGnavigation.java
@Override
  public ProjectionRect latLonToProjBB(LatLonRect rect) {
    BoundingBoxHelper bbhelper = new BoundingBoxHelper(this, maxR);
    return bbhelper.latLonToProjBB(rect);
  }
@Override
  public ProjectionRect latLonToProjBB(LatLonRect rect) {
    BoundingBoxHelper bbhelper = new BoundingBoxHelper(this, maxR);
    return bbhelper.latLonToProjBB(rect);
  }
Create a ProjectionRect from the given LatLonRect.
Handles lat/lon points that do not intersect the projection panel.

@param rect the LatLonRect
@return ProjectionRect, or null if no part of the LatLonRect intersects the projection plane