NorWeST Stream Temperatures 1993-2011 (Feature Layer)

This layer represents modeled stream temperatures derived from the NorWeST point feature class (NorWest_TemperaturePoints). NorWeST summer stream temperature scenarios were developed for all rivers and streams in the western U.S. from the > 20,000 stream sites in the NorWeST database where mean August stream temperatures were recorded. The resulting dataset includes stream lines (NorWeST_PredictedStreams) and associated mid-points NorWest_TemperaturePoints) representing 1 kilometer intervals along the stream network. Stream lines were derived from the 1:100,000 scale NHDPlus dataset (USEPA and USGS 2010; McKay et al. 2012). Shapefile extents correspond to NorWeST processing units, which generally relate to 6 digit (3rd code) hydrologic unit codes (HUCs) or in some instances closely correspond to state borders. The line and point shapefiles contain identical modeled stream temperature results. The two feature classes are meant to complement one another for use in different applications. In addition, spatial and temporal covariates used to generate the modeled temperatures are included in the attribute tables at https://www.fs.usda.gov/rm/boise/AWAE/projects/NorWeST/ModeledStreamTemperatureScenarioMaps.shtml. The NorWeST NHDPlusV1 processing units include: Salmon, Clearwater, Spokoot, Missouri Headwaters, Snake-Bear, MidSnake, MidColumbia, Oregon Coast, South-Central Oregon, Upper Columbia-Yakima, Washington Coast, Upper Yellowstone-Bighorn, Upper Missouri-Marias, and Upper Green-North Platte. The NorWeST NHDPlusV2 processing units include: Lahontan Basin, Northern California-Coastal Klamath, Utah, Coastal California, Central California, Colorado, New Mexico, Arizona, and Black Hills.

本层展示了由 NorWeST 点特征类（NorWest_TemperaturePoints）模型得出的河流温度。NorWeST 夏季河流温度情景针对美国西部所有河流和溪流进行开发，数据来源于 NorWeST 数据库中超过 20,000 个记录了平均8月河流温度的监测点。该数据集包括河流线（NorWeST_PredictedStreams）及其关联的中点（NorWest_TemperaturePoints），这些点代表了河流网络中1公里间隔的河流线。河流线是根据1:100,000比例尺的 NHDPlus 数据集（USEPA 和 USGS 2010；McKay 等人，2012年）得出的。Shapefile 范围与 NorWeST 处理单元相对应，通常与6位（第3级）水文单元代码（HUCs）相关，或在某些情况下与州界紧密对应。线形和点形 Shapefile 包含相同的模型河流温度结果。这两个要素类旨在相互补充，适用于不同的应用场景。此外，生成模型温度所使用的空间和时间协变量已包含在 https://www.fs.usda.gov/rm/boise/AWAE/projects/NorWeST/ModeledStreamTemperatureScenarioMaps.shtml 的属性表中。NorWeST NHDPlusV1 处理单元包括：Salmon、Clearwater、Spokoot、Missouri Headwaters、Snake-Bear、MidSnake、MidColumbia、Oregon Coast、South-Central Oregon、Upper Columbia-Yakima、Washington Coast、Upper Yellowstone-Bighorn、Upper Missouri-Marias 和 Upper Green-North Platte。NorWeST NHDPlusV2 处理单元包括：Lahontan 盆地、北加利福尼亚-沿海 Klamath、犹他州、沿海加利福尼亚、中加利福尼亚、科罗拉多州、新墨西哥州、亚利桑那州和黑山。