Montane Vole Predicted Habitat - CWHR M133 [ds2587]

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).

本研究用于构建栖息地适宜性预测模型的数据集，包含加州常见脊椎动物的加州野生动物栖息地关系（California Wildlife Habitat Relationships, CWHR）分布范围地图，该地图已被数字化为地理信息系统（GIS）图层，以支撑CWHR系统软件的预测工作。这些CWHR分布范围地图的矢量数据集，是加州野生动物栖息地关系系统的组成部分之一——该系统是面向加州陆生脊椎动物的综合性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、教育及研究工作提供支持。CWHR系统收录了已知常栖息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关系等信息。分布范围地图代表了各物种在加州境内的最大当前地理分布范围，最初由物种专家以1:500万比例尺手绘划定，后逐步修订为1:100万比例尺。如需了解CWHR系统的更多信息，可访问CWHR官方网页（https://www.wildlife.ca.gov/Data/CWHR），该网页提供了CWHR数据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查找表、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便携式文档格式（PDF）文件，以及《用户指南》。本模型同时采用了加州林业与消防局（California Department of Forestry and Fire Protections, CALFIRE）的火灾与资源评估项目（Fire and Resource Assessment Program, FRAP）汇编的“最佳可用”土地覆盖数据Fveg。该汇编数据集被制作为单一数据图层，以支撑森林与牧场评估所需的各类分析工作——这是一项法定强制要求的职能。当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。加州的多项法定政府职能均需准确呈现加州境内栖息地类型的空间分布情况。加州林业与消防局的CALFIRE火灾与资源评估项目（FRAP），联合加州鱼类与野生动物局的VegCamp项目，并大量使用美国林务局第5区遥感实验室（USDA Forest Service Region 5 Remote Sensing Laboratory, RSL）的数据，将加州可获取的最佳土地覆盖数据整合为一套完整的全州综合性数据集。该数据集的时间跨度约为1990年至2014年，通常会针对加州各区域收集最新、最详细且一致性最高的数据；研究人员制定了决策规则，用于明确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数据源整合为统一的分类体系，即加州野生动物栖息地关系（CWHR）系统。研究人员将CWHR分布范围数据、FVEG植被地图与CWHR栖息地适宜性等级相结合，生成了各物种的预测栖息地适宜性地图。此类地图展示了对应物种的平均栖息地适宜性得分，其定义遵循CWHR标准：CWHR将各物种在各栖息地阶段（栖息地类型、面积与密度的组合）下，用于繁殖、遮蔽及觅食的栖息地适宜性划分为无适宜性（0）、低（0.33）、中（0.66）与高（1）四个等级。平均得分为繁殖、遮蔽及觅食三项得分的平均值，可进一步划分为低适宜性（得分<0.34）、中适宜性（0.34~0.66）与高适宜性（得分>0.66）。需注意，CWHR的栖息地适宜性等级是基于面积大于40英亩的栖息地斑块制定的，其最适用于面积大于200英亩的栖息地斑块。CWHR预测栖息地适宜性栅格数据的命名规则为4位字母数字混合的CWHR物种ID代码。CWHR物种查找表包含各物种的相关记录，具体包括CWHR ID、学名、通用名及分布范围地图修订历史（可在https://www.wildlife.ca.gov/Data/CWHR下载）。