Layer: Seagrass (ID: 30)

Parent Layer: Reference Layers

Name: Seagrass

Display Field: Hab_Desc

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Description: The seagrasses file is a compilation of multiple datasets to arrive at the most up to date data in TNC's database. Regional data was collected to cover as many countries in the CLME region as possible. For seagrasses, this included information from 3 separate datasets: (1.) For the insular Caribbean, the best available information was compiled by Brigham Young University students through a Nature Conservancy contract in 2011. This effort also began with a compilation of various datasets, supplemented with any original digitization efforts. This information was then checked against high resolution satellite imagery where available from Bing and Esri imagery basemaps. Errors and misrepresentations in the base information were modified through heads up digitization from the high resolution imagery. Omissions of coverage were corrected by creating new polygons to match visible seagrass patches. Outside of the insular Caribbean, (2.) the data from the Mesoamerican region was collected in 2007 as well as (3.) the seagrass dataset compiled by the United Nations Environment Programme – World Conservation Monitoring Centre (UNEP-WCMC) in 2003 in collaboration with Dr. Frederick T. Short at the University of New Hampshire to show the global distribution of seagrass species. The dataset has been developed alongside the publication "World Atlas of Seagrasses" and reflects the opinions of the world's leading seagrass experts with regard to the global distribution of the ecosystem.The regional data was then replaced with sub-regional, national or site level information where this information was available (and wasn't already used in the starting regional file) to obtain a finer scale product. For seagrasses, the following separate datasets were included: (1.) Grenada and St. Vincent and the Grenadines were replaced with data collected from the At the Water’s Edge Project and the ECMMAN project led by the Nature Conservancy. Union Island was created through a contract with Robert Gardiner & Gwilym Rowlands, National Coral Reef Institute, Oceanographic Center, for the AWE project. All of SVG except Union Island was created through object-oriented mapping on 2010 WorldView2 imagery through a contract with Sam Purkins in 2015. Grenada was created through object-oriented mapping on WorldView2 and Pleiades imagery through a contract with Sam Purkins in 2017. (2.) Antigua was replaced with national level benthic habitat data created in 2016 using WorldView-3, Pleiades, and LandSAT8 satellite imagery through a contract with Sam Purkis. For Barbuda, IKONOS-2 satellite imagery collected by GeoEye (now DigitalGlobe) in 2012 is the basis for the layer. The product was created through object-oriented mapping using Definiens eCognition software. (3.) The Bahamas were replaced with data from the National Ecological GAP Assessment in 2008. This seagrass layer is a product of a contract between The Nature Conservancy and The University of South Florida (USF). USF grad students used imagery analysis of Landsat 7 and limited ground-truthing data to derive three classes of seagrass - sparse, medium and dense.(4.) The near-coast of Andros Island in the Bahamas was replaced with data created by The Nature Conservancy through a contract with the National Coral Reef Institute for the Global Environmental Facility-funded Integrating Watershed and Coastal Area Management in Caribbean Small Island Developing States (GEF-IWCAM) Project.The habitat layer was derived from RapidEye multispectral satellite data (RapidEye 2010). (5.) Île à Vache, Haiti was replaced with data collected for the Haiti Southwest Sustainable Development Project in 2012. The project utilized well established image-based remote sensing techniques and used a more advanced high-resolution satellite sensor (Worldview-2) and object-based mapping techniques. (6.) Saint Lucia and Dominica were replaced with national level benthic habitat data created in 2016 using WorldView-3, Pleiades, and LandSAT8 satellite imagery through a contract with Sam Purkis. (7.) Pedro Bank in Jamaica was replaced with data created through object-oriented mapping on WorldView2 imagery through a contract with Sam Purkins in 2014.

Copyright Text: This file was originally created under a contract from UNESCO for the purposes of the CLME Project in 2013. Since then, the file has been updated by TNC as new benthic data becomes available.

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