CEPS Research
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CEPS Research |
(119k)Field
measurement of reflectance spectra for creosote bush, the dominant plant
on the interdunes in southeastern California. This creosote bush is near the
Cadiz dunes in the Cadiz Valley of California. Photo taken 5/23/95.
(39k)
Reflectance spectra of creosote bush in the Cadiz Valley of California. Reflectance is
shown as a percentage of the reflectance from the standard. Water vapor causes strong
absorption at 1400, 1900 and 2600 angstroms. Overall spectra is significantly different
than either the sand or the interdune surface; chlorophyll is the likely cause of
reflectance variations observed from the bush.
(113k)Field
measurement of reflectance spectra for a dried yellow grass, a common small
plant on the interdunes in southeastern California. This dried grass is near
the Cadiz dunes in the Cadiz Valley of California. Photo taken 5/23/95.
(33k)
Reflectance spectra of dried yellow grass in the Cadiz Valley of California.
Reflectance is shown as a percentage of the reflectance from the standard. Water vapor
causes strong absorption at 1400, 1900 and 2600 angstroms. Overall spectra is slightly
different from that of sand or the interdune surface , and it lacks the strong reflectance
variations associated with chlorophyll in green plants like the creosote bush. It is hoped
that eventually the detailed field spectra can be used to classify specific plants and
surfaces using satellite data.
(116k)
Oblique view of stabilized transverse dunes in the Cadiz Valley of California.
Dried Russian thistle (light brown plant) and creosote bushes are abundant in
the interdune areas, while the dunes themselves have green Russian thistle plants.
Field characterization of the the plant distribution is underway on the dune
at right center. Photo taken 5/23/95.
(108k)
Plant characterization on the surface of a transverse dune in the Cadiz
Valley of California. String marks 1-meter grids in which the areal abundance
of dominant plant types are determined. Green Russian thistle plants are around
the figure at center. Photo taken 5/23/95.
(119k) Dried Russian thistle plants are abundant in the interdune areas
in the Cadiz Valley of California. The relatively thin sand cover on the interdunes
apparently preserves considerably less water than the dunes themselves, where
the thistles were still green. Photo taken 5/23/95.
| Revised:
April 2, 2001 (jh) ©1994-2001 National Air and Space Museum |
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