2026-10-07T01:19:04Z https://api.figshare.com/v2/oai

oai:figshare.com:article/32096356 2026-09-16T12:23:21Z category_25888 category_25795 item_type_3 month_year_09_2026

CCWEM_CCWIF Jintao Liang (23790358) Surface water hydrology Geoscience data visualisation Coastal wetlands Inundation frequency Sentinel-2 China <p dir="ltr"><b>CCWEM and CCWIF are two complementary 10 m spatial datasets describing the extent and internal inundation-frequency gradients of China’s coastal wetlands in 2025. </b></p><p dir="ltr">The China Coastal Wetland Extent Map (CCWEM) delineates the maximum extent of natural coastal wetlands, including tidal flats, salt marshes, and mangroves. The vector dataset contains 12 province-level polygon features and attributes describing region identifier, coastal wetland area, and province/region name. </p><p dir="ltr">The China Coastal Wetland Inundation Frequency Map (CCWIF) further characterizes relative inundation-frequency gradients within the CCWEM extent. It contains five annual inundation-duration classes: <30 d, 30–90 d, 90–180 d, 180–300 d, and >300 d. The vector dataset contains 60 polygon features corresponding to 12 coastal regions and five inundation-frequency classes. </p><p dir="ltr">Both datasets use the Asia North Albers Equal Area Conic coordinate reference system (ESRI:102025; WGS 1984 datum), with coordinates expressed in metres and UTF-8 character encoding. CCWEM covers approximately 8906.15 km² of natural coastal wetlands, while the total area represented by CCWIF is approximately 8906.14 km². </p><p dir="ltr">CCWEM and CCWIF are intended to support coastal wetland monitoring, spatial analysis, ecological and hydrological studies, conservation and restoration assessment, and coastal-zone management. Detailed generation methods, validation procedures, and uncertainty analyses are provided in the associated manuscript.</p> 2026-04-25T06:19:15Z Dataset Dataset 10.6084/m9.figshare.32096356.v2 https://figshare.com/articles/dataset/CCWEM_CCWIF/32096356 CC BY 4.0