NorWeST Observed Stream Temperature Points (Feature Layer)

This layer indicates the location of the observed stream temperature records used for the NorWeST database summaries. NorWeST summer stream temperature scenarios were developed for all rivers and streams in the western U.S. from the greater than 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.

该层级标示了用于诺威斯特数据库概要的观测流温度记录的位置。诺威斯特夏季流温度情景涵盖了美国西部所有河流和溪流，基于诺威斯特数据库中超过20,000个流站点记录的平均8月流温度。所得数据集包含流线（NorWeST_PredictedStreams）及其相关的中点（NorWest_TemperaturePoints），代表沿流网络1公里间隔的测量。流线源自1:100,000比例的NHDPlus数据集（USEPA和USGS 2010；McKay等人，2012）。Shapefile范围对应诺威斯特处理单元，通常与6位（第三级）水文单元代码（HUCs）相关，或在某些情况下与州界紧密对应。线状和点状Shapefile包含相同的模型流温度结果。这两个要素类旨在相互补充，适用于不同的应用场景。此外，用于生成模型温度的空间和时间协变量包含在以下网址的属性表中：https://www.fs.usda.gov/rm/boise/AWAE/projects/NorWeST/ModeledStreamTemperatureScenarioMaps.shtml。诺威斯特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以及Upper Green-North Platte。诺威斯特NHDPlusV2处理单元包括：Lahontan Basin、Northern California-Coastal Klamath、Utah、Coastal California、Central California、Colorado、New Mexico、Arizona以及Black Hills。