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DOCUMENTATION_FORMAT: PLANT
SAMPLE_ID: D.spicata at DWV6-0511
PLANT_TYPE: Perennial grass, wetland
PLANT: Saltgrass
LATIN_NAME: Distichlis spicata (L.) Greene
COLLECTION_LOCALITY: Northern Barataria Bay, approximately 58 km south-southeast of New Orleans, Louisiana
COLLECTION_LATITUDE: 29.470882 deg. N
COLLECTION_LONGITUDE: 89.828399 deg. W
DATUM: NAD83
ORIGINAL_DONOR: Raymond F. Kokaly, USGS
SAMPLE_DESCRIPTION:
This spectrum is the average reflectance of 5 field measurements (using an artificial light source) of light brown, non-photosynthetic leaves and stems of saltgrass (Distichlis spicata) selected from a saltmarsh. 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 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. An average spectrum was computed from the 5 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
IMAGE_OF_SAMPLE: Light brown, non-photosynthetic stems and leaves were selected in the sampling area shown in the following photo.
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