Skip Links

USGS - science for a changing world

Open-File Report 2011–1155

PRISM: Processing Routines in IDL for Spectroscopic Measurements (Installation Manual and User's Guide, Version 1.0)

By Raymond F. Kokaly

Thumbnail of and link to report PDF (39.8 MB)


This report describes procedures for installing and using the U.S. Geological Survey Processing Routines in IDL for Spectroscopic Measurements (PRISM) software. PRISM provides a framework to conduct spectroscopic analysis of measurements made using laboratory, field, airborne, and space-based spectrometers. Using PRISM functions, the user can compare the spectra of materials of unknown composition with reference spectra of known materials. This spectroscopic analysis allows the composition of the material to be identified and characterized. Among its other functions, PRISM contains routines for the storage of spectra in database files, import/export of ENVI spectral libraries, importation of field spectra, correction of spectra to absolute reflectance, arithmetic operations on spectra, interactive continuum removal and comparison of spectral features, correction of imaging spectrometer data to ground-calibrated reflectance, and identification and mapping of materials using spectral feature-based analysis of reflectance data. This report provides step-by-step instructions for installing the PRISM software and running its functions.

Posted October 20, 2011

For additional information contact:
Raymond Kokaly
U.S. Geological Survey
Mail Stop 973 Box 25046
Denver Federal Center
Denver, CO 80225–0046
Telephone: (303) 236–1359
Fax: (303) 236–3200
E-mail: Raymond Kokaly

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Kokaly, R.F., 2011, PRISM: Processing routines in IDL for spectroscopic measurements (installation manual and user's guide, version 1.0): U.S. Geological Survey Open-File Report 2011–1155, 432 p., available at




Background and Key Functions of PRISM

Installation of Software

Module 1. ViewSPECPR

Module 2. Spectral Analysis Functions

Module 3. Image Processing Functions

Module 4. MICA – Material Identification and Characterization Algorithm

Release Notes


References Cited

Accessibility FOIA Privacy Policies and Notices logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Contact USGS
Page Last Modified: Monday, October 26, 2020, 02:43:25 PM