public String toString() {
		StringBuilder str = new StringBuilder();
		for (P2<Double> pair : elevation) {
			str.append(Math.round(pair.getFirst()));
			str.append(",");
			str.append(Math.round(pair.getSecond() * 10.0) / 10.0);
			str.append(",");
		}
		if (str.length() > 0)
			str.setLength(str.length() - 1);
		return str.toString();
	}