ASTCHI1

Name

astchi1

Purpose (one Line Only)

Astrometric goodness-of-fit for one image based on rotation and offset

Description

Calling Sequence

chisq = astchi1(x,y,xpred,ypred,xoffset,yoffset,rotang,alpha)

Inputs

x - Measured X position of an object, this is in raw chip coordinates
y - Measured Y position of an object, this is in raw chip coordinates
xpred - Predicted X location of the object
ypred - Predicted Y location of the object
xoffset - Offset to apply to X positions
yoffset - Offset to apply to Y positions
rotang - Rotation to apply to X coordinates (applied after rotation)
alpha - 2-element vector that gives the relative weighting between
the chisq values for the X and Y axes. [1.,1.] would apply
equal weights. [1.,0.] would return just the X chisq, and
so on.

Optional Input Parameters

Keyword Input Parameters

Outputs

return value is a scalar number giving the goodness-of-fit statistic

Keyword Output Parameters

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

Written by Marc W. Buie, Southwest Research Institute, 2010/01/13