2006 Ventenata dubia distribution in the Blue Mountains Ecoregion of Oregon, Washington, and Idaho - probability

This data publication contains two (2) georeferenced raster (GeoTIFF) files representing the 2006 probability and probability classes of Ventenata dubia (ventenata) presence throughout the Blue Mountains Ecoregion located within Oregon, Washington, and Idaho. The Blue Mountains Ecoregion is part of the Environmental Protection Agency (EPA) Level III Ecoregion classification (https://www.epa.gov/eco-research/ecoregions). Presence of ventenata in these data was defined based on field observations of aerial cover, where 20% and greater cover was classified as presence and less than 20% cover was classified as absence. Thus, the probability and probability classes of ventenata presence corresponds to populations with greater than or equal to 20% cover (not individual ventenata plants). Field observations were aggregated from sources including the United States Department of Agriculture (USDA), Forest Service; the Bureau of Land Management (BLM); and Oregon State University (OSU). Ventenata was mapped using the random forests classification method with land surface phenology, climate, soils, and terrain attributes. The 2006 prediction of ventenata was produced from a model trained from land surface phenology in 2017. To improve model transferability, 2006 was chosen based on climatic similarity as measured by a drought severity index and RAWs weather station data. The model was used to determine a probability threshold that is optimal for differentiating both presence and absence (Threshold = 0.58). This threshold was used to split the probability gradient into 6 classes, 2 classes below the threshold and 4 above.The 2006 ventenata distribution was developed to assess the extent and patterns of invasion within the heart of ventenata’s invaded range. Ventenata has been observed throughout the Blue Mountains Ecoregion, but no spatial product was available to indicate areas of infestation or total invaded area for management and policy decisions. These data have been applied to assess contemporary habitat associations, locations of ventenata populations, and the spread of ventenata over time.

本数据出版物包含两个（2）地理参照的栅格（GeoTIFF）文件，分别代表2006年Ventenata dubia（以下简称ventenata）在俄勒冈州、华盛顿州和爱达荷州境内蓝山生态区域的分布概率及其概率类别。蓝山生态区域属于美国环境保护署（EPA）三级生态区域分类体系（https://www.epa.gov/eco-research/ecoregions）。ventenata的存在性依据野外观测到的空中覆盖率进行定义，其中20%及以上的覆盖率被定义为存在，低于20%的覆盖率则被定义为不存在。因此，ventenata存在的概率及其概率类别对应于覆盖率大于或等于20%的种群（而非单个ventenata植株）。野外观测数据来自包括美国农业部（USDA）、林业局；土地管理局（BLM）；以及俄勒冈州立大学（OSU）在内的多个来源。ventenata的分布图是通过随机森林分类方法，结合地表物候、气候、土壤和地形属性进行绘制的。2006年的ventenata预测是基于2017年地表物候训练的模型产生的。为了提高模型的迁移性，基于干旱严重程度指数和RAWs气象站数据的气候相似性，选择了2006年。该模型被用于确定一个最佳的概率阈值，以区分存在和不存在的情况（阈值 = 0.58）。该阈值被用于将概率梯度分为6个类别，其中2个类别位于阈值以下，4个位于阈值以上。2006年的ventenata分布图旨在评估ventenata入侵范围的中心区域入侵程度和分布模式。ventenata在蓝山生态区域内广泛分布，但尚未有空间产品可以指示感染区域或总入侵面积，以供管理和政策决策参考。这些数据已应用于评估当代生境关联、ventenata种群的位置以及ventenata随时间推移的扩散情况。