American Avocet Range - CWHR B164 [ds1466]

Vector datasets of CWHR range maps are one component of California Wildlife Habitat Relationships (CWHR), a comprehensive information system and predictive model for California's wildlife. The CWHR System was developed to support habitat conservation and management, land use planning, impact assessment, education, and research involving terrestrial vertebrates in California. CWHR contains information on life history, management status, geographic distribution, and habitat relationships for wildlife species known to occur regularly in California. Range maps represent the maximum, current geographic extent of each species within California. They were originally delineated at a scale of 1:5,000,000 by species-level experts and have gradually been revised at a scale of 1:1,000,000. For more information about CWHR, visit the CWHR webpage (https://www.wildlife.ca.gov/Data/CWHR). The webpage provides links to download CWHR data and user documents such as a look up table of available range maps including species code, species name, and range map revision history; a full set of CWHR GIS data; .pdf files of each range map or species life history accounts; and a User Guide.CWHR分布范围矢量数据集是加州野生动物栖息地关系（California Wildlife Habitat Relationships，以下简称CWHR）系统的组成部分之一。该系统是一套针对加州野生动物的综合信息系统与预测模型，其开发初衷是为涉及加州陆生脊椎动物的栖息地保护与管理、土地利用规划、影响评估、科普教育及相关研究提供支撑。CWHR系统收录了已知定期出没于加州的野生动物物种的生活史特征、管理现状、地理分布及栖息地关联等信息。分布范围地图展示了各物种在加州境内当前的最大地理分布范围，最初由物种专家以1:500万比例尺绘制，并逐步更新至1:100万比例尺。如需了解CWHR系统的更多信息，请访问其官方网页：https://www.wildlife.ca.gov/Data/CWHR。该网页提供CWHR相关数据与用户文档的下载链接，涵盖可用分布范围地图查询表（包含物种代码、物种名称及分布范围地图修订历史）、全套CWHR地理信息系统（GIS）数据、各分布范围地图或物种生活史说明的PDF文件，以及一份官方用户指南。