ENVI Tutorial

ENVI Tutorial: Introductionto ENVI Plot FunctionsIntroduction to Plot Functions 2Files Used in this Tutorial 2ENVI Plot Functions 2Create a Plot Function 4Add the Plot Function to the Menu 5Set up ENVI to Run the Plot Function 6Open a Spectral Library and Plot Spectra 71ENVI Tutorial: Introduction to ENVI Plot FunctionsIntroduction to Plot FunctionsThis tutorial describes how to implement an ENVI plot function, which is a user-defined function thatyou can add to and call from the Plot_Function menu of any ENVI plot window. This tutorial assumesthat you are familiar with the Interactive Data Language (IDL) and that you understand how to writefunctions and procedures in IDL. ENVI+IDL is required for this tutorial.Files Used in this TutorialENVI Resource DVD: D a t a \ p r o g r a m m i n gF i l e D e s c r i p t i o np f _ 1 s t _ d e r i v a t i v e . p r o Plot function to take the first derivative of a spectrump f _ 2 n d _ d e r i v a t i v e . p r o Plot function to take the second derivative of a spectrumu s e r a d d . t x t Modified (replacement) version of useradd.txt, which resides in the menudirectory of your ENVI installationENVI Resource DVD: D a t a \ s p e c _ l i bF i l e D e s c r i p t i o nu s g s _ m i n . s l i ( . h d r ) USGS mineral spectral libraryENVI Plot FunctionsPlot functions are a special class of ENVI user functions that modify data in an ENVI plot window, suchas a Z Profile window. For example, ENVI’s built-in ...