DOCUMENTATION_FORMAT: PLANT
SAMPLE_ID: Spartina alterniflora at DWV6a4-0511
PLANT_TYPE: Wetland perennial grass
PLANT: Smooth cordgrass
LATIN_NAME: Spartina alterniflora Loisel.
COLLECTION_LOCALITY: Northern Barataria Bay, approximately 58 km south-southeast of New Orleans, Louisiana
COLLECTION_LATITUDE: 29.471418 deg. N
COLLECTION_LONGITUDE: 89.828533 deg. W
DATUM: NAD83
ORIGINAL_DONOR: Raymond F. Kokaly, USGS
SAMPLE_DESCRIPTION:
This spectrum is the average reflectance of 10 field measurements (using an artificial light source)
of gray non-photosynthetic leaves and stems of smooth cordgrass (Spartina alterniflora). Plant leaves and stems were found in a mat on the
surface of the marsh. The measurements were made on May 10, 2011.
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 the mat of leaves and stems.
The contact probe was pressed against the optically thick mat and a spectrum was recorded. Two measurements were made
in each spot before moving the contact probe to a new position.
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.
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 was used in the following publication:
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
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