Manpage of velimage
Section: User Commands (1)
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velimage - Make (x,y,z) image from an (x,y) image and model z-values.
VELIMAGE is a MIRIAD task to make an (x,y,z) image from an (x,y)
image and a model for the z-values and dispersion. The z-values,
for example the mean velocity, are input as an (x,y) image, whilst
the dispersion can be input as either an (x,y) image or a fixed
value. The output image is formed as:-
out(x,y,z) = in1(x,y) * exp(-(z-in2(x,y))**2/(2*sigma**2)))
VELIMAGE can be used to compare models with the data. For example
one can generate a model image corresponding to a rotating galaxy,
convolve it with the actual beam and subtract the model from the
data to determine if there is residual emission which deviates from
the model rotation curve.
The input image names, separated by commas. The first image is the
(x,y) intensity distribution integrated over the z-axis. No default.
e.g. velocity-integrated image. The second image is an (x,y) model
for the z-values, e.g. a mean velocity image. No default.
A 3rd input image gives the z-dispersion at each point. e.g. a
velocity dispersion image. If the 3rd image is not specified then
fixed dispersion, sigma must be specified.
Region of image to be used. The default region is the entire image.
See documentation on region for details. All pixels within the
bounding box are used; pixel masking is not used.
Fixed value for z-dispersion if not specified by 3rd input image.
Number of channels for z-axis of output image. Default=1.
Starting value for z-axis of output image. No default.
Interval for z-axis of output image. No default.
The output (x,y,z) image. No default.
Options. Minimum match is active.
relax ignore axis descriptor mismatches
(e.g. pixel increments etc). Use with care.
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Time: 18:35:39 GMT, July 05, 2011