Reflectance and Fluorescence Index

Welcome to the spectral reflectance and fluorescence index! Presented here are data that were collected during an MIT Sea Grant project. The goal of this project was to make spectral reflectance a reliable method of identifying Didemnum sp..

Each link will direct you to a space delimited ascii file containing wavelength numbers in the first row and percent reflectance or fluorescence data in the following rows. Reflectance data are divided into three main categories: Ambient, Illuminated, and DiveSpec. Ambient and Illuminated are in situ reflectance measurements using a Satlantic HyperOCR radiometer. DiveSpec files contain reflectance measurements that were taken using the DiveSpec, a self-contained submersible radiometer and fluorometer. DiveSpec data were collected both in the lab and in situ.

All reflectance data have been referenced to a 99% reflectance standard and therefore all reflectance data are in percent reflectance. Fluorescence data are in absolute units and the spike seen from about 400-500nm is blue light produced by the DiveSpec. Ambient and Illuminated files contain multiple reflectance spectra, DiveSpec data contain one.

Didemnum sp.	Placopecten magellanicus (Dorsal)
Photo: Suzanne Arnold	Source
Reflectance Ambient: 1  2  3  4  5  6  7 Illuminated: 1  2  3  4  5  6  7 DiveSpec: 1  2  3  4  5  6  7  8  9  10  11  12 Fluorescence DiveSpec: 1  2  3  4  5	Reflectance DiveSpec: 1 Fluorescence DiveSpec: With Sediment on Shell Without Sediment on Shell
Asterias vulgaris (Orange, Dorsal)	Cucumaria frondosa (Body)
Source	Source
Reflectance DiveSpec: 1 Fluorescence DiveSpec: 1	Reflectance DiveSpec: 1
Strongylocentrotus droebachiensis (Dorsal)	Ascophyllum sp.
Source	Source
Reflectance DiveSpec: 1	Reflectance DiveSpec: 1 Fluorescence DiveSpec: 1
Various Porifera	Laminaria sp.
Source	Source
Reflectance Ambient: 1 Illuminated: 1 DiveSpec: 1	Reflectance Illuminated: 1 DiveSpec: 1 Fluorescence DiveSpec: 1
Metridium senile (Retracted)	Various Algae
Source	Source
Reflectance Divespec: 1 Fluorescence DiveSpec: 1	Reflectance Ambient: 1  2 Divespec: 1  2  3  4  5
Sand/Shell Hash	Mud/Shells
Photo: Michael Sauer	Photo: Michael Sauer
Reflectance Illuminated: 1  2  3  4 DiveSpec: 1  2  3	Reflectance Illuminated: 1  2

Created by Thomas Leeuw, 2010

Summary