NOAA Coral Reef Watch Near-Real-Time 50-km Regional Satellite Coral Disease Outbreak Risk Monitoring Product - Hawaiian Archipelago

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Frequently anticipated questions:


What does this data set describe?

Title:
NOAA Coral Reef Watch Near-Real-Time 50-km Regional Satellite Coral Disease Outbreak Risk Monitoring Product - Hawaiian Archipelago
Abstract:
The NOAA Coral Reef Watch (CRW) regional satellite Coral Disease Outbreak Risk monitoring product estimates the potential for infectious disease outbreak in the upcoming summer season for selected regions. The Coral Disease Outbreak Risk is currently an experimental product that is still in a research and development phase; it is produced at 50-km spatial resolution twice-weekly in near-real-time for the Great Barrier Reef and Hawaiian archipelago regions. The product was initially implemented in September 2009 and continues to provide updated monitoring information twice-weekly. This metadata file provides information on the product for both the most recent near-real-time updates and the archived and retrospectively processed product, dating back to the 2001 summer season, for the region indicated in the title above. The Coral Disease Outbreak Risk product comprises a metric of variables developed by CRW, including Winter Cold Snap, Winter Conditions, Seasonal Outlook, Summer Hot Snap, and Current Summer Outbreak Risk. These metrics are derived from CRW's operational sea surface temperature (SST) data generated from the Advanced Very High Resolution Radiometer (AVHRR) on NOAA's operational Polar Orbiting Environmental Satellites (POES). The Winter Cold Snap metric accumulates anomalously cold temperatures through time, as compared with the usual range of winter temperatures, providing an indication of unusually cold events. Such events reflect a reduction in disease pathogen loading during extreme cold periods. The Winter Conditions metric accumulates temperature anomalies during the cold season as compared with the average temperature observed in the three coldest months ("winter") at each location. It represents the variation of the current cold season from the average condition. Mild winters (i.e., neither cool nor warm) have been linked to subsequent outbreaks of White Syndrome disease; research has shown that such outbreaks have not occurred following cool or warm winters, likely related to a reduction in disease pathogen abundance and an increase in host resistance, respectively. The Seasonal Outlook is based solely on the two described cold season metrics; it gives a measure of the pre-disposition to disease outbreak during the following warm season. Only locations that experience mild Winter Conditions are considered to be at-risk, with the likelihood defined by the presence/absence of unusual Cold Snaps. The Seasonal Outlook value is issued at the end of the cold season and provides a 3-6 month forecast of the likelihood of disease outbreak. The Summer Hot Snap metric accumulates anomalously hot temperatures through time, as compared with the usual range of summer temperatures, providing an indication of unusually hot events. This metric represents the level of hot stress that corals experience. The Current Summer Outbreak Risk is assigned only for locations that are deemed at-risk in the Seasonal Outlook and is defined by the level of Hot Snap experienced during the subsequent warm period. Outbreak Risk in the yellow-to-red range indicates that there is a significant likelihood of coral disease, increasing linearly with the color scale. The Outbreak Risk is updated in near-real-time during the warm season on Monday and Thursday. This product, its detailed description, and available data formats and delivery mechanisms are accessible at <http://coralreefwatch.noaa.gov/satellite>, along with general CRW product information and access to other CRW products. Note that the product is available publicly only for the Great Barrier Reef region. It also is available for the Hawaiian archipelago but only to collaborators and interested parties, as validation is presently occurring.
Supplemental_Information:
The disease risk product and SST data mentioned in this metadata file is accessible at: <http://coralreefwatch.noaa.gov/satellite>
  1. How should this data set be cited?

    NOAA Coral Reef Watch program, 20090930, NOAA Coral Reef Watch Near-Real-Time 50-km Regional Satellite Coral Disease Outbreak Risk Monitoring Product - Hawaiian Archipelago: NOAA Coral Reef Watch program, Silver Spring, Maryland, USA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -180.0
    East_Bounding_Coordinate: -152.0
    North_Bounding_Coordinate: 30.0
    South_Bounding_Coordinate: 18.0

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 01-Jan-2001
    Ending_Date: Present
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: remote sensing image, webpage

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 25 x 57, type Grid Cell

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.5. Longitudes are given to the nearest 0.5. Latitude and longitude values are specified in Decimal degrees.

  7. How does the data set describe geographic features?

    Grid Intersection
    For the Hawaiian Islands, there are 57 grid intersections in each row (at a pre-defined latitude) and 325grid intersections in each column (at a pre-defined longitude). Each grid is 0.5 degree latitude by 0.5 degree longitude in size, centered at latitudes from 18.0N northward to 30.0N and at longitudes of from 180.0W eastward to 157.0W for the Hawaiian archipelago. (Source: <http://coralreefwatch.noaa.gov/satellite/research/dz_index.php>)

    Coral Disease Outbreak Risk matrix image files in PNG format
    These are the image display of original Coral Disease Outbreak Risk metric data. (Source: <http://coralreefwatch.noaa.gov/satellite/research/dz_index.php>)

    Range of values
    Minimum:0
    Maximum:255
    Units:Index color values


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    NOAA Coral Reef Watch program
    Attn: NOAA Coral Reef Watch Coordinator
    NOAA, E/RA31, SSMC1, Room 5308, 1335 East-West Highway
    Silver Spring, Maryland 20910-3226
    USA

    301-713-2857 x 109 (voice)
    301-713-3136 (FAX)
    coralreefwatch@noaa.gov


Why was the data set created?

The NOAA Coral Reef Watch Coral Disease Outbreak Risk monitoring product was developed primarily for monitoring and assessment of coral disease outbreak. It serves as a decision support tool to provide critical and timely coral reef environment information to the U.S. and international coral reef communities.


How was the data set created?

  1. From what previous works were the data drawn?

    NOAA CRW Operational Near-Real-Time Global Satellite Sea Surface Temperatures (source 1 of 1)
    NOAA/NESDIS Coral Reef Watch program, 19970101, NOAA CRW Operational Twice-Weekly Near-Real-Time Global 50-km Satellite Nighttime Sea Surface Temperatures: NOAA Coral Reef Watch program, Silver Spring, Maryland, USA.

    Type_of_Source_Media: data file
    Source_Contribution:
    The Coral Disease Outbreak Risk product was derived from this SST product.

  2. How were the data generated, processed, and modified?

    Date: Not complete (process 1 of 1)
    At each pixel, the SST value is evaluated to derive Winter Cold Snap, Winter Conditions, and Summer Hot Snap variables, which are used for generating Seasonal Outlook and Current Summer Outbreak Risk. See CRW web site at: <http://coralreefwatch.noaa.gov/satellite/index.php> and suggested references listed above for details.

    Person who carried out this activity:

    NOAA Coral Reef Watch program
    Attn: NOAA Coral Reef Watch Coordinator
    NOAA, E/RA31, SSMC1, Room 5308, 1335 East West Highway
    Silver Spring, Maryland 20910-3226
    USA

    301-713-2857 x 109 (voice)
    301-713-3136 (FAX)
    coralreefwatch@noaa.gov

    Data sources used in this process:
    • NOAA CRW Operational Near-Real-Time Global Satellite Sea Surface Temperatures

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    The accuracy of the Coral Disease Outbreak Risk metrics depends on the accuracy of the SSTs used for deriving the product. Preliminary analysis of Coral Disease Outbreak Risk metrics has demonstrated initial success in denoting disease outbreak events. Polar Orbiting Environmental Satellite (POES) AVHRR-SST values that the Disease Outbreak Risk is based on are accurate to within 0.5 degrees C and adjusted by in-situ information (buoys) to best-approximate SST at a depth of 1 meter. However, to provide a complete global coverage, estimation of SSTs at all pixels that are cloud covered may occasionally reduce the accuracy of SST at these pixels. Selected references: 1) Heron SF, Willis BL, Skirving WJ, Eakin CM, Page CA, Miller IR (2010) Summer Hot Snaps and Winter Conditions: Modelling White Syndrome Outbreaks on Great Barrier Reef Corals. PLoS ONE 5(8): e12210. doi:10.1371/journal.pone.0012210. 2) The information for the AVHRR-derived sea surface temperature is described in the following guide. Goodrum G., K. B. Kidwell, and W. Winston, 2000, NOAA KLM USER'S GUIDE. U.S. Department of Commerce, National Oceanic and Atmospheric Administration National Environmental Satellite, Data, and Information Service, National Climatic Data Center, Climate Services Division, Satellite Services Branch, FOB3, Room G227, E/CC33, 5200 Auth Road, Suitland, MD 20746-4304, USA. This manual is available on line at <http://www2.ncdc.noaa.gov/docs/klm/cover.htm>. To request additional information contact: Telephone: (828) 271-4850, Telefax: (828) 271-4876, Email: satorder@ncdc.noaa.gov.

  2. How accurate are the geographic locations?

    Users are referred to the following guide on AVHRR-derived sea surface temperature. Goodrum G., K. B. Kidwell, and W. Winston, 2000, NOAA KLM USER'S GUIDE. U.S. Department of Commerce, National Oceanic and Atmospheric Administration National Environmental Satellite, Data, and Information Service, National Climatic Data Center, Climate Services Division, Satellite Services Branch, FOB3, Room G227, E/CC33, 5200 Auth Road, Suitland, MD 20746-4304, USA. This manual is available on line at <http://www2.ncdc.noaa.gov/docs/klm/cover.htm>. To request additional information contact: Telephone: (828) 271-4850, Telefax: (828) 271-4876, Email: satorder@ncdc.noaa.gov.

  3. How accurate are the heights or depths?

    none

  4. Where are the gaps in the data? What is missing?

    There is no spatial data gap existing in this data set. Because this is currently an experimental product undergoing research and development, revisions to the product are anticipated. When a revision is needed, the whole product time series (both current and archived product) will be reprocessed to replace the existing product time series. The near-real-time disease monitoring product will be updated continuously twice-weekly and added into past data collections once a year.

  5. How consistent are the relationships among the observations, including topology?

    none


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: none
Use_Constraints:
Not intended for legal use. Data may contain inaccuracies due to cloud cover and/or other reasons.

  1. Who distributes the data set? (Distributor 1 of 1)

    NOAA Coral Reef Watch program
    Attn: NOAA Coral Reef Watch Coordinator
    NOAA, E/RA31, SSMC1, Room 5308, 1335 East West Highway
    Silver Spring, Maryland 20910-3226
    USA

    301-713-2857 x 109 (voice)
    301-713-3136 (FAX)
    coralreefwatch@noaa.gov

  2. What's the catalog number I need to order this data set?

    Offline Data

  3. What legal disclaimers am I supposed to read?

    NOAA makes no warranty regarding these data and images, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA cannot assume liability for any damages caused by any errors or omissions in these images, nor as a result of the failure of these data to function on a particular system.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    To gain access to the Hawaiian component of the dataset at Coral Reef Watch's web site, please send request to coralreefwatch@noaa.gov.


Who wrote the metadata?

Dates:
Last modified: 29-Jul-2013
Last Reviewed: 29-Jul-2013
Metadata author:
NOAA Coral Reef Watch program
Attn: NOAA Coral Reef Watch Coordinator
NOAA, E/RA31, SSMC1, Room 5308, 1335 East West Highway
Silver Spring, Maryland 20910-3226
USA

301-713-2857 x 109 (voice)
301-713-3136 (FAX)
coralreefwatch@noaa.gov

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


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