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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Lawn_Grass GDS91 Shifts DESCRIPT
DOCUMENTATION_FORMAT: PLANT
SAMPLE_ID: GDS91
PLANT_TYPE: Grass
PLANT: Grass
LATIN_NAME: Not Available
COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)
DATUM: Not Available # coordinate datum
COLLECTION_LOCALITY: Denver West Building #2, Golden, Colorado
ORIGINAL_DONOR: Gregg Swayze
SAMPLE_DESCRIPTION:
The original sample was measured, and a series of shifted and ratioed spectra computed for spectrally testing chlorophylll absorption band shifts. This grass, probably Kentucky Bluegrass was from the lawn outside our offices at the time the grass was picked on June 18, 1991. Generic lawn grass. Run immediately after picking. See Lawn Grass GDS91 description.
The series of shifted spectra are described in the spectroscopic description, below.
END_SAMPLE_DESCRIPTION.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | Water: | %(of fresh weight) | ||
| COMPOSITION: | Total_Chlorophyll: | %(of fresh weight) | ||
| COMPOSITION: | Chlorophyll_A: | %(of fresh weight) | ||
| COMPOSITION: | Chlorophyll_B: | %(of fresh weight) | ||
| COMPOSITION: | Nitrogen: | %(of dry weight) | ||
| COMPOSITION: | Lignin: | %(of dry weight) | ||
| COMPOSITION: | Cellulose: | %(of dry weight) |
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
TRACE_ELEMENT_ANALYSIS:
TRACE_ELEMENT_DISCUSSION:
END_TRACE_ELEMENT_DISCUSSION.
SPECTROSCOPIC_DISCUSSION:
A series of 5 computed spectra were made
Lawn_Grass GDS91 shifted 3nm W1R1Ba AREF
The spectrum above is a 3 nanometer (0.003 micron) shift to longer wavelengths of the original GDS91 spectrum.
Lawn_Grass GDS91 /shifted 3nm W1R1Ba AREF
The spectrum above is the unshifted / shifted spectrum. The ratio of these
two spectra produces a hump with a maximum near 0.69 microns. This ratio method
is documented in Figure 26 of
Clark, R. N., Chapter 1: Spectroscopy of Rocks and Minerals, and
Principles of Spectroscopy, in Manual of Remote Sensing, Volume 3,
Remote Sensing for the Earth Sciences, (A.N. Rencz, ed.) John Wiley
and Sons, New York, p 3- 58, 1999, and can be found online at:
http://speclab.cr.usgs.gov/PAPERS.refl-mrs
Lawn_Grass GDS91 +const 1.0 W1R1Ba AREF
The spectrum above is the original Lawn_Grass GDS91 spectrum plus a constant of 1.0. This spectrum represents a weakened chlorophyll feature when partial vegetation covers the area of a remote sensing pixel.
Lawn_Grass GDS91 +1shft 3nm W1R1Ba AREF
The spectrum above is original Lawn_Grass GDS91 spectrum plus a constant of 1.0 and shifted to longer wavelengths by 3 nanometer (0.003 micron).
Lawn_Grass GDS91 +1shf/unshifted W1R1Ba AREF
The spectrum above is the Lawn_Grass GDS91 plus constant 1.0 ratioed to the
shifted spectrum (also with the constant 1.0). The ratio of these two spectra
produces a hump with a maximum near 0.73 microns showing what might be expected
to detect red-edge shifts in areas of trace vegetation. This ratio method is
documented in Figure 26 of
Clark, R. N., Chapter 1: Spectroscopy of Rocks and Minerals, and
Principles of Spectroscopy, in Manual of Remote Sensing, Volume 3,
Remote Sensing for the Earth Sciences, (A.N. Rencz, ed.) John
Wiley and Sons, New York, p 3- 58, 1999, and can be found online at:
http://speclab.cr.usgs.gov/PAPERS.refl-mrs
The ratio method for detecting red-edge shifts is used in the
Tetracorder mapping system:
Clark, R.N., G. A. Swayze, K. E. Livo,
R. F. Kokaly, S. J. Sutley, J. B. Dalton, R. R.McDougal, and C.
A. Gent., Imaging Spectroscopy: Earth and Planetary Remote Sensing
with the USGS Tetracorder and Expert Systems, Journal of Geophysical
Research, In Press, 2003. http://speclab.cr.usgs.gov/PAPERS/tetracorder
Very strong chlorophyll absorption in the visible and strong liquid water absorptions near 1, 1.2, 1.5 and 2 microns.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
| LIB_SPECTRA_HED: | where | Wave Range | Av_Rs_Pwr | Comment |
|---|---|---|---|---|
| LIB_SPECTRA: | splib04a r 5286 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 12140 | 0.2-3.0µm | 200 | |
| LIB_SPECTRA: | splib05a r 12157 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 12172 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 12188 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 12206 | 0.2-3.0µm | 200 | g.s.= |
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