NorWeST Stream Temperatures 2040s (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.

本层展示的是基于NorWeST点特征类（NorWest_TemperaturePoints）构建的模拟河流水温数据。NorWeST夏季河流水温情景模型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个测点的平均8月河流水温记录。所形成的数据库包含河流线（NorWeST_PredictedStreams）及其对应的中间点（NorWest_TemperaturePoints），这些点代表沿河流网络1公里的间隔。河流线数据来源于1:100,000比例尺的NHDPlus数据集（USEPA和USGS 2010；McKay等，2012）。Shapefile的覆盖范围与NorWeST处理单元相对应，通常与6位数字（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。线和点形状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，适用于不同的应用场景。此外，用于生成模拟水温的时空协变量也包含在属性表中，可通过以下链接获取：https://www.fs.usda.gov/rm/boise/AWAE/projects/NorWeST/ModeledStreamTemperatureScenarioMaps.shtml。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。