Peninsular Leaf-Toed Gecko Predicted Habitat - CWHR R009 [ds2390]

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，包含加利福尼亚州常驻脊椎动物的加州野生动物栖息地关系（California Wildlife Habitat Relationships，以下简称CWHR）分布范围地图。此类地图已被数字化为地理信息系统（Geographic Information System，以下简称GIS）图层，以支撑CWHR系统软件的预测功能。
这套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（以下简称CWHR）系统的核心组成部分之一。该系统是一套针对加州陆生脊椎动物的综合性信息系统与预测模型，其开发目标是为栖息地保护与管理、土地利用规划、环境影响评价、科普教育及相关研究提供全方位支持。
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、保护管理等级、地理分布范围及栖息地关联关系等核心信息。其分布范围地图表征了各物种在加州境内当前的最大地理分布边界，最初由物种分类专家以1:5000000的比例尺手绘绘制，并逐步更新至1:1000000的比例尺。如需了解CWHR系统的更多详情，可访问其官方网页（https://www.wildlife.ca.gov/Data/CWHR），该页面提供了CWHR数据与用户文档的下载链接，包括涵盖物种代码、物种通用名及分布范围地图修订历史的可用分布范围地图查询表、全套CWHR地理信息系统数据集、各物种分布范围地图或生活史说明的PDF文件，以及《CWHR用户指南》。
本栖息地适宜性预测模型同时采用了由CALFIRE-FRAP汇编的、被称为Fveg的“最佳可用”土地覆盖数据。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——这是一项由美国加州立法授权的政府职能。目前该数据集正处于持续更新阶段，以支撑动态分析，并为2015年的下一届FRAP评估做好准备。加州境内各类由立法强制要求的政府职能均需准确表征栖息地类型的空间分布状况。
加州林业与消防局（California Department of Forestry and Fire Protection，以下简称CALFIRE）下属的火灾与资源评估项目（Fire and Resource Assessment Program，以下简称FRAP），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（United States Department of Agriculture，以下简称USDA）林务局第五大区遥感实验室（Remote Sensing Laboratory，以下简称RSL）的公开数据，将加州境内可获取的“最佳可用”土地覆盖数据整合为一套完整的全州范围数据集。该数据集的时间跨度约为1990年至2014年，通常针对加州各区域采集了最新、最详细且一致性最强的观测数据。研究团队制定了明确的决策规则，以明确重叠区域内各数据图层的优先级，并通过分类转换对照表将各类数据源整合至统一的分类体系——加州野生动物栖息地关系（以下简称CWHR）系统。
研究人员将CWHR分布范围数据与Fveg植被地图、CWHR栖息地适宜性等级相结合，为各物种生成了栖息地适宜性预测栅格地图。该类地图展示了各物种的平均栖息地适宜性得分，其评分规则源自CWHR标准。CWHR将各物种在每种生境阶段（生境类型、面积与密度的组合）下的繁殖、遮蔽与觅食适宜性划分为四个等级：无适宜性（0分）、低适宜性（0.33分）、中适宜性（0.66分）与高适宜性（1分）。平均得分为繁殖、遮蔽与觅食三项得分的算术平均值，据此可将适宜性重新划分为低适宜性（得分<0.34）、中适宜性（0.34~0.66）与高适宜性（得分>0.66）。需特别注意，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，其最优适用场景为面积大于200英亩的栖息地斑块。
CWHR栖息地适宜性预测栅格数据以4位字母数字混合的CWHR物种ID代码命名。《CWHR物种查询表》包含各物种的完整记录信息，包括其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下载获取）。