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.

Extents
	Extent - Geographic
	West longitude -75.695288
	East longitude -69.661491
	North latitude 41.913035
	South latitude 38.773638

	Extent - GeoTiFF coordinate system
	West coordinate 442339.408691
	East coordinate 943639.408691
	North coordinate 4640354.418669
	South coordinate 4304054.418669

Spatial Representation - Grid
	Number of Dimensions 2
	Axis dimension properties
		Dimension
			Dimension name: column
			Dimension size: 1671
			Resolution
				Distance 300.0
		Dimension
			Dimension name: row
			Dimension size: 1121
			Resolution
				Distance 300.0

	Corner points
		CornerPoint 442339.408691 4640354.418669
		CornerPoint 442339.408691 4304054.418669
		CornerPoint 943639.408691 4640354.418669
		CornerPoint 943639.408691 4304054.418669

Content Information
	Feature Catalog Description
		Files listed in this catalog contain a collection of daily satellite derived products in GeoTIFF format. Details of each product may be found below. Full details regarding the products and others provided by the Harmful Algal Bloom Forecast Branch at NOAA's National Centers for Coastal Ocean Science can be found in the Technical Report (https://repository.library.noaa.gov/view/noaa/30906).
		Filenames follow the following naming conventention:
			<sat>.yyyyjjj.mmdd.hhmm...hhmmC.L3.<areacode>.<srccode><version>.<productname>.tif
				<sat>		name of satellite
				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
				<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: chl_gil_rhos
			Version: 1.4
			Description: 2-band gilerson chlorophyll based on rho_s with correction for pixels identified as clear water. Coastal chlorophyll scaling applied.
			Scaling: round(275.0 / (1 + 13.46374 / chl[chl>0]))
			Reverse scaling: 13.46374 / ((275.0 / DN) - 1) (for example: DN=100 translates to original value = 7.6936)
			Type: 1-band data
			Data key:
				0 - no detection
				250 - above range
				252 - land
				253 - cloud
				255 - no data coverage
				1 - 249: scaled valid data

			Product name: rbd_rhos
			Version: 1.0
			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
				255 - no data coverage
				1 - 249: scaled valid data

			Product name: truecolor
			Version: 1.0
			Description: RGB true color image
			Scaling: round(1 * <band> * 255 / 0.2)
			Type: 3-band RGB


Reference System Information
	Spatial reference:
		PROJCS["WGS 84 / UTM zone 18N",
		    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",-75],
		    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","32618"]]

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: 2023-10-03