coordinatesystem.py 文件源码

def pixelscale(self):

        """
        This function ...
        :return:
        """

        result = utils.proj_plane_pixel_scales(self)

        # returns: A vector (ndarray) of projection plane increments corresponding to each pixel side (axis).
        # The units of the returned results are the same as the units of cdelt, crval, and cd for the celestial WCS
        # and can be obtained by inquiring the value of cunit property of the input WCS WCS object.

        x_pixelscale = result[0] * Unit("deg/pix")
        y_pixelscale = result[1] * Unit("deg/pix")

        # Return the pixel scale as an extent
        return Pixelscale(x_pixelscale, y_pixelscale)

    # -----------------------------------------------------------------