cart_to_lwpoint()

LWPOINT * cart_to_lwpoint	(	const double_t	x_sum,
		const double_t	y_sum,
		const double_t	z_sum,
		const double_t	weight_sum,
		const int32_t	srid
	)

Definition at line 233 of file geography_centroid.c.

{
    double_t x = x_sum / weight_sum;
    double_t y = y_sum / weight_sum;
    double_t z = z_sum / weight_sum;
 
    /* x-y-z vector length */
    double_t r = sqrtl(powl(x, 2) + powl(y, 2) + powl(z, 2));
 
    double_t lon = atan2l(y, x) * 180 / M_PI;
    double_t lat = acosl(z / r) * 180 / M_PI - 90;
 
        return lwpoint_make2d(srid, lon, lat);
}

References lwpoint_make2d(), r, pixval::x, and pixval::y.

Referenced by geography_centroid_from_wpoints().

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