static RenderedImage rasterizeLine(double x1, double y1, double x2, double y2, Product product) {
final SimpleFeatureType featureType = Placemark.createGeometryFeatureType();
final DefaultFeatureCollection featureCollection = new DefaultFeatureCollection("line", featureType);
final GeometryFactory geometryFactory = new GeometryFactory();
final Coordinate[] coordinates = {new Coordinate(x1, y1), new Coordinate(x2, y2)};
final Geometry geometry = geometryFactory.createLineString(coordinates);
final SimpleFeature lineFeature = PlainFeatureFactory.createPlainFeature(featureType, "line", geometry, null);
featureCollection.add(lineFeature);
return new FeatureOpImage(featureCollection, product);
}