NorWeST Stream Temperatures 2080s (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点要素类（NorWest_TemperaturePoints）推导出的模拟河流水温。NorWeST夏季河流水温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月河流水温的监测点。所得数据集包括河流线（NorWeST_PredictedStreams）及其相关中点（NorWest_TemperaturePoints），它们代表了河流网络中每1公里的间隔。河流线是从1:100,000比例尺的NHDPlus数据集中推导而来（USEPA和USGS 2010；McKay等，2012）。Shapefile范围对应于NorWeST处理单元，通常与6位（第3级）水文单元代码（HUCs）相联系，或在某些情况下与州界紧密对应。线形和点形文件包含相同的模拟河流水温结果。这两个要素类旨在相互补充，以适应不同的应用场景。此外，用于生成模拟温度的空间和时间协变量也包含在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 Basin、Northern California-Coastal Klamath、Utah、Coastal California、Central California、Colorado、New Mexico、Arizona和Black Hills。