Level 2 Help for ZCIRCLE

An input image

An output image

VICAR size field (SL,SS,NL,NS)

	where
    	   SL is the starting line for output
   	   SS is the starting sample for output
	   NL is the number of lines in the output image
	   NS is the number of samples in the output image

is the starting line for output.
Default is 1.

is the starting sample for output.
Default is 1.

is the number of lines in the output image.
Default is the number of lines in the input dataset.

is the number of samples i the output image.
Default is the number of samples in the input dataset.

is the center sample coordinate in pixels.
Default is (NS+1)/2.

is the center line coordinate in pixels.
Default is (NL+1)/2.

is the average radius of the circle or ellipse.
Default is (NL+NS)/4.

is the "polar" radius of the ellipse and overrides the R value.
Default is determined from the R, REQ, and ECC values.

is the "equatorial" radius of the ellipse and overrides the R value
Default is determined from the R, RPOL, and ECC values.

is the eccentricity of the ellipse and may be -1<ECC<+1.  When ECC is
negative, the polar axis becomes the major axis.
Default is zero (circle).

is an azimuthal angle of rotation of the polar axis, measured
clockwise and may be -90<ANG<+90.
Default is 0.0.

is the DN value to replace removed data for BYTE, HALF and FULL format data.
Default is 0 or -32768 or -214748638 for BYTE or HALF or FULL.

is the DN value to replace removed data for REAL*4 format data.
Default is -1.7E38.

is a keyword to specify that all pixels inside the limits of
the defined circle or ellipse are to be removed.
Default is that pixels outside of the circle or ellipse
are removed.