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
    
Extents
	Extent - Geographic
	West longitude -16.929400
	East longitude -4.765562
	North latitude 58.027831
	South latitude 47.866796

	Extent - GeoTiFF coordinate system
	West coordinate 30000.000000
	East coordinate 750000.000000
	North coordinate 6439651.047592
	South coordinate 5320651.047592

Spatial Representation - Grid
	Number of Dimensions 2
	Axis dimension properties
		Dimension
			Dimension name: column
			Dimension size: 2400
			Resolution
				Distance 300.0
		Dimension
			Dimension name: row
			Dimension size: 3730
			Resolution
				Distance 300.0

	Corner points
		CornerPoint 30000.000000 6439651.047592
		CornerPoint 30000.000000 5320651.047592
		CornerPoint 750000.000000 6439651.047592
		CornerPoint 750000.000000 5320651.047592

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: rbd_rhos
			Version: x0.1
			Description: Rhos red band (681-665) difference
			Scaling: round(150 * (4 + log10(rbd[rbd > 0])))
			Reverse scaling: 10**(DN / 150. - 4) (for example: DN=100 translates to original value = 0.0005)
			Type: 1-band data
			Data key:
				0 - no detection
				250 - above range
				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: round(1.0 * <band> * 255 / 0.2)
			Type: 3-band RGB

Reference System Information
	Spatial reference:
		PROJCS["WGS 84 / UTM zone 29N",
		    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",-9],
		    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","32629"]]

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
	NOAA National Centers for Coastal Ocean Science; Contains modified Copernicus Sentinel-3 data from EUMETSAT.

Usage Constraints Information
	Provisional products subject to change.

Metadata Information
	Creation date: 2022-05-26