Ecological Subsection_ Soils

This Existing Vegetation (Eveg) polygon feature class is a CALVEG (Classification and Assessment with LANDSAT of Visible Ecological Groupings) map product from a scale of 1:24,000 to 1:100,000 for CALVEG Zone 9, the Great Basin. Source imagery for this layer ranges from the year 1999 to 2009. The CALVEG classification system was used for vegetation typing and crosswalked to other classification systems in this database including the California Wildlife Ha The Soil Subsections feature class contains ecological subsection polygons attributed with soil characteristics to show relationships between ECOMAP 2007 and soil data from STATSGO, 2005. The EcomapSubsections 2007 data set describes the ecological sections within the conterminous United States. It contains regional geographic delineations for analysis of ecological relationships across ecological units.

本现存植被（Existing Vegetation，简称Eveg）多边形要素类，是面向大盆地CALVEG第9分区的基于Landsat的可见生态分组分类与评估（CALVEG，Classification and Assessment with LANDSAT of Visible Ecological Groupings）制图产品，比例尺范围为1:24000至1:100000。该图层的源影像采集时间跨度为1999年至2009年。CALVEG分类体系被用于植被类型划分，并可与本数据库中的其他分类体系进行交叉映射，其中涵盖加州野生动物栖息地相关分类体系。土壤亚区（Soil Subsections）要素类包含带有土壤属性特征的生态亚区多边形，用于展示生态制图2007（ECOMAP 2007）与2005版STATSGO土壤数据之间的关联关系。2007版生态亚区数据集（EcomapSubsections 2007）描述了美国本土范围内的生态分区。该数据集包含用于跨生态单元开展生态关系分析的区域地理区划信息。