Narragansett Bay Estuarine and Marine Wetlands Trend Analysis

This hosted feature layer has been published in RI State Plane Feet NAD 83 A trend analysis of estuarine and marine wetlands in Narragansett Bay and their 500-foot upland buffer delineated from 1990s era true color aerial photography and 1950s era black and white aerial photography and coded according to U.S. Fish and Wildlife Service's Classification of Wetlands and Deepwater Habitats of the United States (Cowardin, L.M., V. Carter, F.C. Golet, and T. Laroe. 1979.(Reprinted 1992). U.S. Fish and Wildlife Service, Washington DC. FWS/OBS-79/31. 103 pp." ) and Anderson, J.R., E.E. Hardy, J.T. Roach and R.E. Witmer. 1976. A Land Use and Land Cover Classification System for Use with Remote Sensor Data. U.S. Geological Survey Professional Paper 96A. U.S. Government Printing Office, Washington, D.C. 28pp These data identify coastal wetland and buffer zone trends including losses, gains and changes in classification in the Rhode Island portion of the Narragansett Bay Estuary and to identify these same trends in 6 pilot areas including 1930s to 1950s trends. Planning for the protection and restoration of coastal wetland and buffer zone restoration. Target minimum polygonal mapping unit was 0.25 acre for discrete coastal wetlands本托管要素图层采用罗德岛州平面英尺坐标系NAD 83（RI State Plane Feet NAD 83）发布，针对纳拉甘西特湾（Narragansett Bay）的河口与滨海湿地及其500英尺高地缓冲区开展趋势分析。该数据基于20世纪90年代真彩色航空摄影与20世纪50年代黑白航空摄影绘制，并依据两套权威分类标准进行编码：其一为美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service）发布的《美国湿地与深水栖息地分类标准》（Cowardin, L.M., V. Carter, F.C. Golet及T. Laroe, 1979年，1992年重印，美国鱼类及野生动物管理局，华盛顿特区，FWS/OBS-79/31，共103页）；其二为Anderson, J.R., E.E. Hardy, J.T. Roach与R.E. Witmer于1976年提出的《适配遥感数据的土地利用与土地覆盖分类系统》（美国地质调查局专业报告96A，美国政府印刷局，华盛顿哥伦比亚特区，共28页）。本数据集旨在识别纳拉甘西特湾河口罗德岛州管辖范围内的滨海湿地与缓冲区变化趋势，包括面积增减、分类变更，同时针对6个试点区域开展相同的趋势分析，涵盖20世纪30年代至50年代的变化情况，服务于滨海湿地与缓冲区的保护及修复规划。离散滨海湿地的最小多边形制图单元阈值为0.25英亩。