FRACTIONAL IMPERVIOUS SURFACE 1990 NBEP2026 (raster)

Seamless raster of fractional impervious surface for the Narragansett Bay, Little Narragansett Bay, and Southwest Coastal ponds watersheds with a 30-meter resolution. This dataset was created for the 2026 Status and Trends report (nbep.org) and is intended for general planning, graphic display, and GIS analysis at the watershed and subwatershed scale.针对纳拉甘西特湾、小纳拉甘西特湾及西南沿海池塘流域的30米分辨率无缝隙分数不透水面栅格数据集。本数据集为2026年《现状与趋势》报告（nbep.org）制作，适用于流域及子流域尺度的通用规划、图形展示与地理信息系统（GIS）分析。