Terrestrial-Marine Watershed Boundaries on the Delmarva Peninsula of Virginia 2001

This coverage contains the watershed boundaries for the coastal/marine watersheds on the eastern side of the Delmarva Peninsula in Virginia. Watersheds were delineated by Bruce P. Hayden from information (contours, elevations) on USGS 1:24,000 Quad Maps (1975). John H. Porter digitized those boundaries and closed the polygons by digitizing the 5-foot contour.  VERSION 2 (2013-08-27): David L. Richardson added names for all the numbered watersheds, reprojected data to NAD83 datum, and fixed alignment issues that had crept in for northernmost watersheds (north of and including Bundick Creek).

本数据集涵盖弗吉尼亚州德尔马瓦半岛东侧沿海与海洋流域的流域边界。流域划分工作由布鲁斯·P·海登（Bruce P. Hayden）完成，其依据为美国地质调查局（United States Geological Survey，简称USGS）1:24,000比例尺标准幅地形图（1975年版）中的等高线与高程数据。约翰·H·波特（John H. Porter）对上述边界进行数字化处理，并通过数字化5英尺等高线完成多边形闭合。版本2（2013-08-27）：大卫·L·理查森（David L. Richardson）为所有编号流域添加了专属名称，将数据重投影至北美大地基准面1983（North American Datum 1983，简称NAD83），并修复了最北部流域（邦德溪以北且包含邦德溪流域）存在的对齐偏差问题。