Basic Information on polargrid

Task: polargrid
Purpose: Regrid an image to a polar coordinate system
Categories: map analysis

Sample an image in terms of a polar coordinate system and create
a new image where the x-axis is the azimuthal coordinate and the
y-axis is the radial coordinate.  The radial coordinate can be
in either decimal or logarithmic units.
See also the REGRID program for more WCS based transformations.

Note this program assumes an astronomical image, and square pixels.

Key: in
Input data cube. 
No default.

Key: out
Interpolated regridded output data cube.
No default.

Key: center
Center of the polar coordinate system, in pixels where
(1,1) is the lower left point in a map.
By default the mapcenter will be taken.

Key: phase
Polar coordinate phase angle (degrees).
Default: 0.0

Key: radius
Starting, ending and step value in radial grid. 
Optionally these three numbers can be followed by the 
coordinate type (a string). Currently supported are 'linear',
'logarithmic' and 'ln' (natural logarithmic).
The units of the radii are in the units of that
coordinate system.
Example: -1,2,0.01,log is a logarithmic axis from 0.1" to 100"
By default the all pixels will fit in the output map, with a
linear grid and stepsize of 1 pixel.

Key: angle
Starting, ending and stepsize in polar angle, as measured from
the phase angle given earlier.  If the starting angle is larger
than the ending angle, the coordinate system will be defined
with angle  increasing in the clockwise sense rather than
in a counterclockwise sense.  Angles are given in degrees.
** i believe the program does the reverse **
Default: -180,180,1

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