Historical Woodland Density of the Conterminous United States, 1873 (Feature Layer)

This dataset includes polygons with a minimum of 40 acres of woodlands per square mile as depicted in William H. Brewer�s 1873 map of woodland density and covers the conterminous United States. Each polygon has been labeled with the density category (1-5) depicted on the original map. This dataset was created by georeferencing a scanned version of the source map and by heads-up digitizing each woodland density polygon.This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService OGC WMS CSV Shapefile GeoJSON KML For complete information, please visit https://data.gov.

本数据集包含由威廉·H·布鲁尔于1873年绘制的林密度图上所描绘的、每平方英里至少拥有40英亩林地面积的闭合多边形，涵盖了整个美国大陆。每个多边形均被标记为原始地图上所展示的密度类别（1-5）。该数据集通过将源地图的扫描版进行地理配准，并逐个进行高程数字化处理林密度多边形而创建。本记录源自美国农业部企业数据目录，该目录为https://data.gov目录提供数据。本记录的数据资源包括以下内容：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS地理服务、OGC WMS、CSV、Shapefile、GeoJSON、KML。欲获取完整信息，请访问https://data.gov。