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LutInterp - Look-up table interpolation method

Description:
This attribute indicates the method to be used when finding the output value of a LutMap for an input value part way between two table entries. If it is set to 0 (the default) then linear interpolation is used. Otherwise, nearest neighbour interpolation is used.

Using nearest neighbour interpolation causes AST__BAD to be returned for any point which falls outside the bounds of the table. Linear interpolation results in an extrapolated value being returned based on the two end entries in the table.

Type:
Integer.
Class Applicability:
LutMap
All LutMaps have this attribute.


next up previous 264
Next: MajTickLen(axis) - Length of major tick marks for a Plot
Up: AST Attribute Descriptions
Previous: LonAxis - Index of the longitude axis

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council