Abstract
	Ocean color products derived from  the Ocean Colour Land Imager (OLCI) aboard the European Space Agency's Sentinel-3 satellite. Products are calculated from Remote Sensing Reflectance (Rrs) and/or top of atmosphere reflectance corrected for Rayleigh scattering and molecular absorption (Rhos).

Purpose
	For use in estimating water quality and detecting algal blooms in the Continental US.

Status:
    
    As of 4-1-2022 our Sentinel-3A and -3B OLCI processing implemented the latest ESA OLCI vicarious calibration. Products generated prior to processing updated were reprocessed.

    As part of the reprocessing the filenaming for OLCI products changed (see examples below and more specific details in the Feature Catalog Description section):
    
        Old filenames:
            sentinel-3a.2022095.0405.1527C.L3.CB3.v951T20227_1_2_x0-2.rbd_rhos.tif
            sentinel-3b.2022095.0405.1447C.L3.CB3.v951T20227_1_2_x0-2.rbd_rhos.tif
            sentinel-3ab.2022095.0405.1447_1527C.L3.CB3.v951T20227_1_2_x0-2.rbd_rhos.tif

        New filenames:
            sentinel-3.2022095.0405.1527C.a.L3.CB3.v951T20227_1_3.rbd_rhos.tif
            sentinel-3.2022095.0405.1447C.b.L3.CB3.v951T20227_1_3.rbd_rhos.tif
            sentinel-3.2022095.0405.1447_1527C.ab.L3.CB3.v951T20227_1_3.rbd_rhos.tif

    The CInoncyano product has also been renamed CInonfluor.

Extents
	Extent - Geographic
	West longitude -84.125686
	East longitude -82.126663
	North latitude 44.871519
	South latitude 43.480627

	Extent - GeoTiFF coordinate system
	West coordinate 252939.274869
	East coordinate 408939.274869
	North coordinate 4969324.292109
	South coordinate 4818724.292109

Spatial Representation - Grid
	Number of Dimensions 2
	Axis dimension properties
		Dimension
			Dimension name: column
			Dimension size: 520
			Resolution
				Distance 300.0
		Dimension
			Dimension name: row
			Dimension size: 502
			Resolution
				Distance 300.0

	Corner points
		CornerPoint 252939.274869 4969324.292109
		CornerPoint 252939.274869 4818724.292109
		CornerPoint 408939.274869 4969324.292109
		CornerPoint 408939.274869 4818724.292109

Content Information
	Feature Catalog Description
		Files listed in this catalog contain a collection of daily products in GeoTIFF format. Details of each product may be found below.
		Filenames follow the following naming conventention:
           		<mission>.yyyyjjj.mmdd.hhmm...hhmmC.<satids>.L3.<areacode>.<srccode><l2genversion>_<SAPSversion>_<prodscriptversion>.<productname>.tif
				<mission>	name of mission
				yyyy		4-digit year
				jjj		julian day (zero-prefixed)
				mm		month of year (zero-prefixed)
				dd		day of month (zero-prefixed)
				hh		hour (zero-prefixed)
				mm		minute (zero-prefixed)
				<areacode>		areacode
				<satids>        one or more satellite platform identifiers (e.g. a, b, or ab (daily composite))
				<srccode>		level 2 source code (v=SAPS,n=NASA,e=ESA)
				<l2genversion>		level 2 generating software version
				<SAPSversion>		SAPS software version
				<prodscriptversion>	product generating script version
				<productname>		standard product name

		Products
			Product name: CIcyano
			Version: 1.1
			Description: Chlorophyll Cyanobacteria Index - cyano only with Kd clear water correction and CInoMCI adjacency flagging
			Scaling: round(83.3 * (log10(ci[ci>0]) + 4.2))
			Reverse scaling: 10**(3.0 / 250.0 * DN - 4.2) (for example: DN=100 translates to original value = 0.0010)
			Type: 1-band data
			Data key:
				0 - no detection
				250 - above range
				251 - adjacency
				252 - land
				253 - cloud
				254 - mixed or invalid
				255 - no data coverage
				1 - 249: scaled valid data

			Product name: truecolor
			Version: 1.0
			Description: RGB true color image
			Scaling: 1.0 * <band> * 255 / 0.2
			Type: 3-band RGB


Reference System Information
	Spatial reference:
		PROJCS["WGS 84 / UTM zone 17N",
		    GEOGCS["WGS 84",
		        DATUM["WGS_1984",
		            SPHEROID["WGS 84",6378137,298.257223563,
		                AUTHORITY["EPSG","7030"]],
		            AUTHORITY["EPSG","6326"]],
		        PRIMEM["Greenwich",0,
		            AUTHORITY["EPSG","8901"]],
		        UNIT["degree",0.0174532925199433,
		            AUTHORITY["EPSG","9122"]],
		        AUTHORITY["EPSG","4326"]],
		    PROJECTION["Transverse_Mercator"],
		    PARAMETER["latitude_of_origin",0],
		    PARAMETER["central_meridian",-81],
		    PARAMETER["scale_factor",0.9996],
		    PARAMETER["false_easting",500000],
		    PARAMETER["false_northing",0],
		    UNIT["metre",1,
		        AUTHORITY["EPSG","9001"]],
		    AXIS["Easting",EAST],
		    AXIS["Northing",NORTH],
		    AUTHORITY["EPSG","32617"]]

Contact Information
	Name: Richard Stumpf
	Organization: US DOC; NOAA; NOS; National Centers for Coastal Ocean Science
	Email: Richard.Stumpf@noaa.gov
	Role: Principal Investigator

	Name: Michelle Tomlinson
	Organization: US DOC; NOAA; NOS; National Centers for Coastal Ocean Science
	Email: Michelle.Tomlinson@noaa.gov
	Role: Collaborator


Credit
	Contains modified Copernicus Sentinel-3a data from EUMETSAT.

Usage Constraints Information
	Provisional products subject to change.

Metadata Information
	Creation date: 2018-08-28