private double addLatitude(double base, double offset) {
        double newLatitude = base + offset;
        if (newLatitude <= LATITUDE_BOUND) {
            return newLatitude;
        } else {
            return -(crossBound(newLatitude, LATITUDE_BOUND));
        }
    }

    private double subtractLatitude(double base, double offset) {
        double newLatitude = base - offset;
        if (newLatitude >= -LATITUDE_BOUND) {
            return newLatitude;
        } else {
            return crossBound(newLatitude, LATITUDE_BOUND);
        }
    }

    private double addLongitude(double base, double offset) {
        double newLongitude = base + offset;
        if (newLongitude <= LONGITUDE_BOUND) {
            return newLongitude;
        } else {
            return crossBound(newLongitude, LONGITUDE_BOUND);
        }
    }

    private double subtractLongitude(double base, double offset) {
        double newLongitude = base - offset;
        if (newLongitude >= -LONGITUDE_BOUND) {
            return newLongitude;
        } else {
            return -(crossBound(newLongitude, LONGITUDE_BOUND));
        }
    }

    private double crossBound(double newValue, double bound) {
        return bound - (Math.abs(newValue) - bound);
    }