class SRTMProvider implements ElevationProvider {

    String getFileString(double lat, double lon) {
        int intKey = calcIntKey(lat, lon);
        String str = areas.get(intKey);
        if (str == null)
            return null;

        int minLat = Math.abs(down(lat));
        int minLon = Math.abs(down(lon));
        str += "/";
        if (lat >= 0)
            str += "N";
        else
            str += "S";

        if (minLat < 10)
            str += "0";
        str += minLat;

        if (lon >= 0)
            str += "E";
        else
            str += "W";

        if (minLon < 10)
            str += "0";
        if (minLon < 100)
            str += "0";
        str += minLon;
        return str;
    }

    public  SRTMProvider();

}