Eastern Kingsnake Predicted Habitat - CWHR R058 [ds2438]

The datasets used in the creation of the predicted Habitat Suitability models includes the CWHR range maps of Californias regularly-occurring vertebrates which were digitized as GIS layers to support the predictions of the CWHR System software. These vector datasets of CWHR range maps are one component of California Wildlife Habitat Relationships (CWHR), a comprehensive information system and predictive model for Californias 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.The models also used the CALFIRE-FRAP compiled "best available" land cover data known as Fveg. This compilation dataset was created as a single data layer, to support the various analyses required for the Forest and Rangeland Assessment, a legislatively mandated function. These data are being updated to support on-going analyses and to prepare for the next FRAP assessment in 2015. An accurate depiction of the spatial distribution of habitat types within California is required for a variety of legislatively-mandated government functions. The California Department of Forestry and Fire Protections CALFIRE Fire and Resource Assessment Program (FRAP), in cooperation with California Department of Fish and Wildlife VegCamp program and extensive use of USDA Forest Service Region 5 Remote Sensing Laboratory (RSL) data, has compiled the "best available" land cover data available for California into a single comprehensive statewide data set. The data span a period from approximately 1990 to 2014. Typically the most current, detailed and consistent data were collected for various regions of the state. Decision rules were developed that controlled which layers were given priority in areas of overlap. Cross-walks were used to compile the various sources into the common classification scheme, the California Wildlife Habitat Relationships (CWHR) system.CWHR range data was used together with the FVEG vegetation maps and CWHR habitat suitability ranks to create Predicted Habitat Suitability maps for species. The Predicted Habitat Suitability maps show the mean habitat suitability score for the species, as defined in CWHR. CWHR defines habitat suitability as NO SUITABILITY (0), LOW (0.33), MEDIUM (0.66), or HIGH (1) for reproduction, cover, and feeding for each species in each habitat stage (habitat type, size, and density combination). The mean is the average of the reproduction, cover, and feeding scores, and can be interpreted as LOW (less than 0.34), MEDIUM (0.34-0.66), and HIGH (greater than 0.66) suitability. Note that habitat suitability ranks were developed based on habitat patch sizes >40 acres in size, and are best interpreted for habitat patches >200 acres in size. The CWHR Predicted Habitat Suitability rasters are named according to the 4 digit alpha-numeric species CWHR ID code. The CWHR Species Lookup Table contains a record for each species including its CWHR ID, scientific name, common name, and range map revision history (available for download at https://www.wildlife.ca.gov/Data/CWHR).

用于生成生境适宜性预测模型的数据集，涵盖加州常见脊椎动物的加州野生动物生境关系 (California Wildlife Habitat Relationships) 分布范围地图。该类地图已被数字化为地理信息系统 (Geographic Information System) 图层，以支撑CWHR系统软件的预测工作。这类CWHR分布范围地图的矢量数据集，是加州野生动物生境关系系统的组成部分之一——该系统是一套面向加州野生动物的综合性信息系统与预测模型。CWHR系统的开发，旨在为加州陆生脊椎动物相关的生境保护与管理、土地利用规划、环境影响评价、科普教育及科研工作提供支撑。CWHR收录了加州已知常见野生动物物种的生活史、管理现状、地理分布及生境关联等信息。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。该类地图最初由物种专家以1:500万比例尺绘制，并逐步更新为1:100万比例尺。如需了解CWHR的更多信息，请访问其官方网页（https://www.wildlife.ca.gov/Data/CWHR）。该网页提供了CWHR数据集与用户文档的下载链接，包括：涵盖物种代码、物种名称及分布范围地图修订历史的可用分布范围地图对照表；全套CWHR地理信息系统数据集；各分布范围地图或物种生活史说明的PDF文件；以及《用户指南》。本次建模还使用了由CALFIRE-FRAP汇编的、被称为Fveg的“最优可用”土地覆被数据。该汇编数据集被整合为单一数据图层，以支撑《森林与牧场评估》所需的各类分析工作——该评估是一项法定强制职能。目前该数据集正在更新，以支撑持续开展的分析工作，并为2015年的下一次FRAP评估做准备。准确刻画加州境内生境类型的空间分布，是多项法定政府职能的必要前提。加州林业与消防局（California Department of Forestry and Fire Protection）的火灾与资源评估项目（Fire and Resource Assessment Program），联合加州鱼类与野生动物局的VegCamp项目，并大量使用美国农业部林务局第五区域遥感实验室（Remote Sensing Laboratory）的数据，将加州境内可获取的“最优可用”土地覆被数据整合为一套全州性综合性数据集。该数据集的时间跨度约为1990年至2014年。通常，加州各区域会采集最新、最详尽且一致性最强的数据。研究人员制定了决策规则，用于确定重叠区域内各图层的优先级，并通过数据转换对照表将各类来源的数据整合至统一的分类体系——即CWHR系统。研究人员将CWHR分布数据与FVEG植被地图、CWHR生境适宜性等级相结合，生成了各物种的生境适宜性预测地图。该类地图展示了物种的平均生境适宜性得分，该得分的定义遵循CWHR标准。CWHR将生境适宜性按物种在各生境阶段（生境类型、面积与密度的组合）下的繁殖、遮蔽与觅食需求划分为四个等级：无适宜性（0分）、低适宜性（0.33分）、中适宜性（0.66分）及高适宜性（1分）。平均得分为繁殖、遮蔽与觅食三项得分的平均值，其等级可划分为：低适宜性（得分低于0.34）、中适宜性（0.34至0.66）及高适宜性（得分高于0.66）。需注意，生境适宜性等级的制定基于面积大于40英亩的生境斑块，其适用的最优场景为面积大于200英亩的生境斑块。CWHR生境适宜性预测栅格数据的命名遵循4位字母数字混合的物种CWHR ID代码规则。CWHR物种对照表收录了各物种的相关记录，包括其CWHR ID、学名、通用名及分布范围地图修订历史（可从https://www.wildlife.ca.gov/Data/CWHR下载获取）。