Bleaching Risk Assessment Tool for the Maldives

This page contains online maps for assessing bleaching risk in the Maldives.  To learn more about the project and the methods used to develop thermal stress regimes, click here.  All thermal stress layers are derived from NOAA’s CoRTAD Version 4 product.

There are six components to this page:

  1. NOAA’s Coral Reef Watch virtual station provides a daily summary of bleaching risk for Male.
  2. An embedded interactive Google Map provides access to thermal stress regimes developed as part of this project (based on methods detailed in Mumby et al 2011).
  3. A second embedded interactive Google Map provides access to other thermal stress layers.
  4. An embedded  Google Earth (requires free plug-in) provides access to current (twice weekly) bleaching alert from NOAA’s Coral Reef Watch.
  5. An embedded Google Earth (requires free plug-in) provides access to predicted (four month outlook) bleaching outlook from NOAA’s Coral Reef Watch.
  6. A download section for accessing Excel,  Google Earth (kmz) and GIS (shapefiles) files for desktop use as well as project documentation.

Note: NOAA Coral Reef Watch data and images (items 1, 3 & 4 above) are accessing files stored on NOAA servers.  Occasionally, the NOAA site may be unavailable due to maintenance and/or technical issues.  If this occurs, these data will not be avialable

 

  1. Current bleaching risk for Male:

 
vs_infobox_Male_Maldives.gif

  1. Current bleaching risk for Male:

 

Access to Male time series graphs and data from NOAA.

E-mail coralreefwatch@noaa.gov to subscribe to free automatic e-mail bleaching alert for Male.

2. Thermal stress regimes for all Maldives.  Each pixel is clickable to determine basic information about the regime, such as chronic stress and acute stress and pixel label (useful as key for Excel version of data).  Thermal regimes are: A (low acute, high chronic; orange); B (high acute, high chronic; red); C (low acute, low chronic; light blue); and D (high acute, low chronic; dark blue).  All layers, including legends, can be toggled on and off.  More information can be found here.

Click here to view full page map

 

     

    3. Thermal stress regimes for all Maldives are shown as above. Additional layers incldue: acute stress (DHW from 1998); chronic stress (maximum of weekly climatology, calcualted from entire time series (1982 -2010) after weeks with acute stress (DHW > 1) have been removed) and percent of total weeks in time series (1,513) that had a DHW >= 4).  Additional layers may be added as the project progresses.  More information can be found here.

    Click here to view full page map


    4. Google Earth showing current bleaching alert for the Maldives (from NOAA’s Coral Reef Watch):

    NOAA Bleaching Alert

     

    Gadgets powered by Google

     

    NOAA Bleaching Alert

     

    Gadgets powered by Google

    5. Google Earth showing predicted bleaching outlook for the Maldives (from NOAA’s Coral Reef Watch):

    NOAA Bleaching Outlook

     

    Gadgets powered by Google

    NOAA Bleaching Outlook

     

    Gadgets powered by Google

     

    6. File downloads:

    Click here for full access BRAT online directory of products

    BRAT products are organized into three general categories, or tiers, that reflect different levels of required interaction, software and training. The particular tier used by individual stakeholders will depend on their objectives, skills and available time to self-train.

    • Tier 1: All the spatial analysis and mapping results are consolidated into a final BRAT Excel spreadsheet. Thermal stress metrics are available for each reef location in the Maldives according to a defined grid system which is also used in the above online maps (items 2 & 3) and all GIS and Google Earth layers. A simple visual key allows users to associate specific reef sites (such as monitoring sites) with the corresponding BRAT grid. No spatial analysis or GIS skill is required to use these data.
    • Tier 2: Products are available as Google Earth and ESRI shapefiles.  Google Earth files can be loaded into freely available Google Earth desktop software.  Shapefiles can be read by most desktop GIS software inclduding ESRI ArcMap.  All the layers shown above are available as files.  Additional layers may be added as the project progresses.
    • Tier 3: This Tier will focus on the more sophisticated and technical aspects of satellite imagery processing and GIS analysis. UQ will provide documentation and training material that will allow users to follow a recipe to produce Tier 2 thermal stress GIS layers for any new bleaching events that occur after the project ends. The goal is to build technical capacity within the Maldives, so that BRAT can endure well past the end data of the UQ contract and be refined and updated as new imagery and information becomes available. Specific training material will include the necessary processing steps required to incorporate new imagery in calculations of thermal stress metrics; this will be particularly important when future bleaching events occur and when NOAA releases a new version of the Coral Reef Temperature Anomaly Database (CoRTAD).  Documentation will be added soon after a training workshop is conducted in Male during the week of June 8, 2014.

    Other relevant data and layers: