doi:10.25923/twc0-f025 Harmful Algal Bloom Forecasting Branch Ocean Color Satellite Imagery Processing Guidelines NOAA NOS National Centers for Coastal Ocean Science Center for Coastal Monitoring and Assessment Timothy Wynne, Andrew Meredith, Travis Briggs, Wayne Litaker, Richard Stumpf October 2018 NOAA TECHNICAL MEMORANDUM NOS NCCOS 252 NOAA National Centers for Coastal Ocean Science Citation Wynne, T., A. Meredith, T. Briggs, W. Litaker, and R. Stumpf 2018. Harmful Algal Bloom Forecasting Branch Ocean Color Satellite Imagery Processing Guidelines. NOAA Technical Memorandum NOS NCCOS 252. Silver Spring, MD. 48 pp. doi:10.25923/twc0-f025 Mention of trade names or commercial products does not constitute endorsement or recommendation for their use by the United States government. Harmful Algal Bloom Forecasting Branch Ocean Color Satellite Imagery Processing Guidelines October 2018 Timothy Wynne, Andrew Meredith, Travis Briggs, Wayne Litaker, and Richard Stumpf Harmful Algal Bloom –Forecasting Branch National Oceanic and Atmospheric Administration, National Ocean Service, National Centers for Coastal Ocean Science, Center for Coastal Monitoring and Assessment, Silver Spring, MD 20910 NOAA Technical Memorandum NOS NCCOS 252 United States Department National Oceanic and National of Commerce Atmospheric Administration Ocean Service Wilbur L. Ross, Jr. Tim Gallaudet Nicole LeBoeuf Secretary RDML (Ret.), Acting Administrator Acting Assistant Administrator Table of Contents 1. Introduction .......................................................................................................................................... 1 2. Satellites From Which Data Are Obtained ............................................................................................ 2 2.1. SeaWiFS ......................................................................................................................................... 2 2.2. MODIS ........................................................................................................................................... 2 2.3. MERIS ............................................................................................................................................ 3 2.4. OLCI ............................................................................................................................................... 3 2.5. Sentinel-2 ...................................................................................................................................... 3 2.6. Landsat .......................................................................................................................................... 4 2.7. VIIRS .............................................................................................................................................. 4 3. Products ................................................................................................................................................ 4 3.1. Cyanobacterial Index (CI) ................................................................................................................... 6 3.1.1. CIcyano .................................................................................................................................. 7 1.1. Maximum Chlorophyll Index (MCI) ............................................................................................. 10 1.2. Diffuse Attenuation Coefficient (Kd) ........................................................................................... 11 1.3. Chlorophyll .................................................................................................................................. 12 1.3.1. OCx ...................................................................................................................................... 12 1.3.2. ESA alg1 and alg2 ................................................................................................................ 13 1.4. True Color .................................................................................................................................... 14 1.5. Scumcolor.................................................................................................................................... 14 1.6. Rrs665 ......................................................................................................................................... 15 2. Processing ........................................................................................................................................... 17 2.1. Product format ............................................................................................................................ 18 2.2. Product file naming ..................................................................................................................... 18 2.3. Level 3 GeoTiff format ................................................................................................................ 19 2.4. Flags ............................................................................................................................................ 20 2.4.1. Clouds .................................................................................................................................. 20 2.4.2. Glint ..................................................................................................................................... 20 2.4.3. Snow and Ice ....................................................................................................................... 21 2.4.4. Sensor Saturation ................................................................................................................ 22 2.5. Land and Dry Lake Bed ................................................................................................................ 23 3. Georeferencing ................................................................................................................................... 24 4. Dissemination ..................................................................................................................................... 24 4.1. Website ....................................................................................................................................... 24 4.2. HAB bulletin ................................................................................................................................ 24 4.3. Other ........................................................................................................................................... 25 5. Future work ......................................................................................................................................... 25 References .................................................................................................................................................. 26 Acronyms Used: .......................................................................................................................................... 28 Appendices .................................................................................................................................................. 29 A1. SeaWiFS band characteristics ..................................................................................................... 29 A2. MODIS band characteristics from Section 1.2 ............................................................................ 29 A3. MERIS band characteristics from Section 1.3 ............................................................................. 31 A4. OLCI band characteristics from section 1.4 ................................................................................ 32 A5. Landsat-8 OLI specifications ........................................................................................................ 33 A6. Sentinel-2 band characteristics from Section 1.5 ....................................................................... 33 A7. VIIRS band characteristics from Section 1.6 ............................................................................... 34 B1. SeaWiFS flags .................................................................................................................................... 35 B2. MERIS/OLCI flags ............................................................................................................................... 36 B3. MODIS flags ....................................................................................................................................... 38 Appendix C: Clear water correction ........................................................................................................ 40 CI: MODIS clear water correction ........................................................................................................... 40 C2: MERIS/OLCI clear water correction .................................................................................................. 40 Appendix D: Scaling Factors .................................................................................................................... 41 Appendix E: Clear water correction ........................................................................................................ 41 Appendix F: MODIS processing flowchart ..............................................................................................