rt_raster_get_phys_params()

void rt_raster_get_phys_params	(	rt_raster	rast,
		double *	i_mag,
		double *	j_mag,
		double *	theta_i,
		double *	theta_ij
	)

Calculates and returns the physically significant descriptors embodied in the geotransform attached to the provided raster.

Parameters

rast	the raster containing the geotransform of interest
i_mag	size of a pixel along the transformed i axis
j_mag	size of a pixel along the transformed j axis
theta_i	angle by which the raster is rotated (radians positive clockwise)
theta_ij	angle from transformed i axis to transformed j axis (radians positive counterclockwise)

Definition at line 231 of file rt_raster.c.

{
    double o11, o12, o21, o22 ; /* geotransform coefficients */
 
    if (rast == NULL) return ;
    if ( (i_mag==NULL) || (j_mag==NULL) || (theta_i==NULL) || (theta_ij==NULL))
        return ;
 
    /* retrieve coefficients from raster */
    o11 = rt_raster_get_x_scale(rast) ;
    o12 = rt_raster_get_x_skew(rast) ;
    o21 = rt_raster_get_y_skew(rast) ;
    o22 = rt_raster_get_y_scale(rast) ;
 
    rt_raster_calc_phys_params(o11, o12, o21, o22, i_mag, j_mag, theta_i, theta_ij);
}

References rtpixdump::rast, return(), rt_raster_calc_phys_params(), rt_raster_get_x_scale(), rt_raster_get_x_skew(), rt_raster_get_y_scale(), and rt_raster_get_y_skew().

Referenced by RASTER_setRotation().

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