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DOCUMENTATION_FORMAT: PLANT
SAMPLE_ID: Spartina alterniflora near CRMS-0322v06
PLANT_TYPE: Wetland perennial grass
PLANT: Smooth cordgrass
LATIN_NAME: Spartina alterniflora Loisel.
COLLECTION_LOCALITY: Coastwide Reference Monitoring System (CRMS) site 322 near subplot v06. CRMS322v06 is located in southern Louisiana, approximately 127 kilometers southwest of New Orleans, Louisiana, in the western part of the Terrebonne hydrologic basin on the coast of the Gulf of Mexico.
COLLECTION_LATITUDE: 29.245450 deg. N
COLLECTION_LONGITUDE: 91.107449 deg. W
DATUM: NAD83
ORIGINAL_DONOR: Raymond F. Kokaly, USGS
SAMPLE_DESCRIPTION:
This spectrum is the average reflectance of 12 field measurements (using an artificial light source)
of brown non-photosynthetic leaves and stems of smooth cordgrass (Spartina alterniflora). These standing stems and leaves appeared to be last season's senescent vegetation and showed little evidence of degradation.
The measurements were made on June 7, 2010.
These spectra were made using an ASD Field Spectrometer 3 (FS3) in reflectance mode, relative to a Spectralon reference panel.
The contact probe attachement (an artificial light source with a restricted, 1 cm diameter, field of view)
was used to measure the reflectance spectra of bundles of leaves and stems.Plant stems and leaves in the top 30 cm of the canopy were bunched together.
The contact probe was pressed against the optically thick bundle and a spectrum was recorded at two positions along the length of each bundle.
An average spectrum was computed from the recorded measurements.
The average spectrum was converted to absolute reflectance by multiplying by the reflectance spectrum of the Spectralon reference panel.
The first 50 channels (0.35 - 0.40 microns) in the spectral measurement show relatively high levels of noise.
Site Classification
The area has been predominantly classified as saline marsh (see http://lacoast.gov/crms2/home.aspx).
General Site Description
The plot is located in southern Louisiana, approximately 127 kilometers southwest of New Orleans, Louisiana.
It is in the western part of the Terrebonne hydrologic basin on the coast of the Gulf of Mexico.
For additional information on the CRMS site see http://lacoast.gov/crms2/home.aspx
Project Background
This site was measured as part of joint work between the USGS Denver Spectroscopy Laboratory and the
Coastal Restoration Assessment Branch of the USGS National Wetlands Research Center, Baton Rouge.
This spectrum, labeled as "Veg-DrySpartina", was published and described in:
Kokaly, R.F., Couvillion, B.R., Holloway, J.M., Roberts, D.A., Ustin, S.L., Peterson, S.H., Khanna, S., and Piazza, S.C., 2013,
Spectroscopic remote sensing of the distribution and persistence of oil from the Deepwater Horizon spill in Barataria Bay marshes,
Remote Sensing of Environment, Volume 129, Pages 210-230. http://dx.doi.org/10.1016/j.rse.2012.10.028
IMAGE_OF_SAMPLE: in the site layout diagram, the subplot location is indicated by the matching number within the parentheses
END_SAMPLE_DESCRIPTION.
COMPOSITIONAL_ANALYSIS_TYPE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
TRACE_ELEMENT_ANALYSIS:
TRACE_ELEMENT_DISCUSSION:
END_TRACE_ELEMENT_DISCUSSION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns