tags$html(
tags$head(
tags$title('About page')
),
tags$body(
tags$h2('Snow Telemetry (SNOTEL) Network'),
tags$p('The SNOTEL network is composed of over 800 automated data
collection sites located in remote, high-elevation mountain
watersheds in the western U.S. They are used to monitor snowpack,
precipitation, temperature, and other climatic conditions.
The data collected at SNOTEL sites are transmitted to a central
database, called the Water and Climate Information System, where
they are used for water supply forecasting, maps, and reports.'),
tags$p('SNOTEL sites are designed to operate unattended and without
maintenance for a year or more. A typical SNOTEL remote site
consists of measuring devices and sensors, an equipment shelter for
the radio telemetry equipment, and an antenna that also supports the
solar panels used to keep batteries charged.'),
tags$p('A standard sensor configuration includes a snow pillow, a storage
precipitation gage, and a temperature sensor. The snow pillow
measures how much water is in the snowpack by weighing the
snow with a pressure transducer. Devices in the shelter convert
the weight of the snow into the snow water equivalent -- that is,
the actual amount of water in a given volume of snow.'),
tags$p('SNOTEL stations also collect data on snow depth,
all-season precipitation accumulation, and air temperature
with daily maximums, minimums, and averages. Many enhanced SNOTEL
sites are equipped to take soil moisture and soil temperature
measurements at various depths, as well as solar radiation,
wind speed, and relative humidity. The configuration at each site
is tailored to the physical conditions, the climate, and the
specific requirements of the data users. The data collected at
SNOTEL sites are generally reported multiple times per day,
with some sensors reporting hourly.'),
tags$img(src='http://www.wcc.nrcs.usda.gov/images/snotel_callouts.jpg'),
tags$h2('Acknowledgements'),
tags$p('Please acknowledge downloaded data through
the R snotelr package properly, citing all relevant literature.')
)
)
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