Overview of This Tutorial - Department of Geosciences

Tutorial: Hyperspectral Signatures and Spectral Resolution
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ENVI Tutorial: Hyperspectral Signatures and Spectral Resolution
Overview of This Tutorial
This tutorial compares the spectral resolution of several different sensors and the effect of resolution on the
ability to discriminate and identify materials with distinct spectral signatures. The tutorial uses Landsat
Thematic Mapper (TM) data, GEOSCAN data, Geophysical and Environmental Resarch 63-band (GER63) data,
Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data, and HyMap data from Cuprite, Nevada, USA,
for intercomparison and comparison to materials from the USGS spectral library.
Files Used in This Tutorial
CD-ROM: Tutorial Data CD #2
Paths: envidata/cup_comp
envidata/cup99hym
envidata/c95avsub
Required files (envidata\cup_comp)
File Description
usgs_em.sli (.hdr)
Subset of USGS spectral library
cuptm_rf.img (.hdr)
TM reflectance subset
cuptm_em.txt
Kaolinite and alunite average spectra from
cuptm_rf.img
cupgs_sb.img (.hdr)
GEOSCAN reflectance image subset
cupgs_em.txt
Kaolinite and alunite average spectra from
cupgs_sb.img
cupgersb.img (.hdr)
GER63 reflectance image subset
cupgerem.txt
Kaolinite and alunite average spectra from
cupgersb.img
Required files (envidata\cup99hym)
File Description
cup99hy.eff (.hdr)
HyMap reflectance data
cup99hy_em.txt
Kaolinite and alunite average spectra from
cup99hy.eff
Required files (envidata\c95avsub)
File Description
cup95eff.int (.hdr)
AVIRIS EFFORT-polished, atmospherically corrected
apparent reflectance data, converted to integer
format by multiplying the reflectance values by 1000
to conserve disk space. Values of 1000 represent
reflectance values of 1.0.
cup95eff.txt
Kaolinite and alunite average spectra from
cup95eff.int
Optional files (envidata\c95avsub)
File Description
usgs_min.sli (.hdr)
USGS spectral library. Use if you want a more detailed
comparison.