How to directly get First Derivative band images from hyperspectral reflectance band images (0 to 288 bands) using ENVI software or band math??
1. I have the stacked reflectance 288 bands in a .dat file.
2. I want to know how to convert reflectance spectral bands to first derivative reflectance spectral bands using by software e.g. ENVI, ArcGIS, IDL, Matlab, Savitzky–Golay transfromation, and so on.
Thanks in advance and cheers.
I am not familiar with ENVI software, however, Iam interested in HSI. I suggest you to try doing the task with Image-J. I hope that this answer may help.
you can use classic ENVI to perform derivative analysis.
go to tab THOR workflows, Tools, Spectral Smoothing
In spectral smoothing you can option of derivative function.
IDL’s DERIV function (David Gorodetzky) use this plug-in to the ENVI...
Rajasheker Reddy Pullanagari Thanks for your expertise. The answer would be really helpful for my works using ENVI. Thanks again.
Somnath Paramanik Thanks for your anwswer. I've actually tried DERIV function using IDL, but the results were quite different comparing with Savitzky–Golay derivative result caculated by excel. Anyway, your attention was helpful to me. Thank you so much.
Ramy Abdlaty Thank you for your answer. Sounds would be one of the great alternatives to complete my works. Thanks and cheers.
Yongsik Jeong Savitzky–Golay is a filter, it is used for smoothing. So they will be varied and before derivative analysis this filtering is quite useful to reduce the noise.
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