Input data for: Patterns and variability of projected bioclimate habitat for Pinus albicaulis in the Greater Yellowstone Area

Field observations of P. albicaulis adult (DBH>20cm) presences and absences within the Greater Yellowstone Area compiled from three data sources. 2,545 observations from the Forest Inventory and Analysis (FIA) program were assembled. FIA plots are located on a regular gridded sampling design with one plot at approximately every 2,500 forested hectares, with swapped and fuzzed exact plot locations within 1.6 km to protect privacy. To provide the most spatial accuracy, this study culled FIA field points where measured elevation were >300 m different from a 30 m USGS DEM. Supplementary points were drawn from the Whitebark/Limber Pine Information System (WLIS), and long-term monitoring plots established by the National Park Service Greater Yellowstone Inventory and Monitoring Network (GYRN). The presences in these two additional datasets were co-located within predictor pixels of FIA absence to correct for false absences. In doing so, only one P.albicaulis presence or absence record was associated per predictor pixel, thereby avoiding issues associated with sampling bias that are common when building bioclimate niche models with data from targeted surveys, for a total of 938 presences and 1,633 absences. Dataset also includes merged 30 year climate normals from 1950-1980. Variables listed include minimum temperature (tmin - oC), maximum temperature (tmax - oC), precipitation (ppt - mm), actual evapotranspiration (aet - mm), potential evapotranspiration (pet - mm), snow water equivalent (pack -mm), soil moisture (soilm - mm), vapor pressure deficit (vpd - Pa).本数据集涵盖大黄石区域内胸径（Diameter at Breast Height, DBH）大于20cm的P. albicaulis成年个体的存在与不存在野外观测记录，整合自三类数据源。研究整合了美国森林资源清查与分析计划（Forest Inventory and Analysis, FIA）的2545条观测记录。FIA样地采用规则网格采样设计，每约2500公顷林地设置一个样地；为保护隐私，样地精确坐标会在1.6公里范围内进行偏移与模糊处理。为保障最高空间精度，本研究剔除了实测高程与30米分辨率美国地质调查局数字高程模型（USGS DEM）差值超过300米的FIA野外样点。 补充样点取自白皮松/柔枝松信息系统（Whitebark/Limber Pine Information System, WLIS），以及美国国家公园管理局大黄石区域清查与监测网络（National Park Service Greater Yellowstone Inventory and Monitoring Network, GYRN）设立的长期监测样地。为修正假不存在记录偏差，将这两类额外数据集的存在记录匹配至FIA不存在记录对应的预测像素单元内。最终每个预测像素仅关联一条P. albicaulis存在或不存在记录，以此规避基于靶向调查数据构建生物气候生态位模型时常见的采样偏差问题，最终得到总计938条存在记录与1633条不存在记录。 本数据集还整合了1950-1980年的30年气候基准值，包含的变量有：最低气温（tmin，单位：摄氏度）、最高气温（tmax，单位：摄氏度）、降水量（ppt，单位：毫米）、实际蒸散量（actual evapotranspiration, aet，单位：毫米）、潜在蒸散量（potential evapotranspiration, pet，单位：毫米）、雪水当量（snow water equivalent, pack，单位：毫米）、土壤含水量（soil moisture, soilm，单位：毫米）以及水汽压亏缺（vapor pressure deficit, vpd，单位：帕斯卡）。