Plate.WCSValid Property

Plate.WCSValid (read-only, Boolean)

True if WCS coordinate data is valid (estimated or corrected)

Syntax

Plate.WCSValid

The property syntax has these parts:

Part	Description
Value (Boolean)	True if WCS coordinate data is valid (estimated or corrected)

Remarks

This must be true before calling Solve(). The World Coordinate System data is contained in the following properties:

RightAscension
Declination
ArcsecPerPixelHoriz
ArcsecPerPixelVert
RollAngle (defaults to 0)
Equinox (defaults to 2000.0)

Strictly speaking, WCS also defines "reference coordinates" in the image. PinPoint uses the center of the image as the WCS reference, as do most other astronomical applications. It also requires an equinox value for the celestial coordinates (incorrectly called "epoch" in old applications). This defaults to J2000.0 in this version of PinPoint. In any case, you must either manually set each of the above properties for the Plate, or they must be present in WCS data originally contained in the attached image, before calling Solve(). Note that Solve() does not write out the updated data, you must call the UpdateFITS() or WriteFITS() method for that.