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<!DOCTYPE html>
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<title>Density of Stations Reporting Daily Precipitation</title>
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<h2>Density of Stations Reporting Daily Precipitation</h2>
<hr class="my-4">
<p>
The following plots give the density of stations reporting the daily precipitation throughout a particular time interval.
</p>
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<div class="col-md-6">
<!-- <div class="thumnbail"> -->
<h4>1860-1899</h4>
<a href="static/img/prcp-1860-1899.png"> <img src="static/img/prcp-1860-1899.png"
alt="..." class="img-thumbnail"> </a>
<!-- </div> -->
</div>
<div class="col-md-6">
<!-- <div class="thumbnail"> -->
<h4>1900-1939</h4>
<a href="static/img/prcp-1900-1939.png"><img src="static/img/prcp-1900-1939.png" alt="..." class="img-thumbnail">
<!-- </div> --></a>
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<!-- Force next columns to break to new line at md breakpoint and up -->
<div class="w-100 d-none d-md-block"></div>
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<!-- <div class="thumbnail"> -->
<h4>1940-1979</h4>
<a href="static/img/prcp-1940-1979.png"><img src="static/img/prcp-1940-1979.png" alt="..." class="img-thumbnail">
<!-- </div> --></a>
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<h4>1980-2019</h4>
<a href="static/img/prcp-1980-2019.png"><img src="static/img/prcp-1980-2019.png" alt="..." class="img-thumbnail"></a>
</div>
</div>
<p>We can see the addition of station data to the archive over time and the expanding spatial coverage of
measurements. The United States has the densest network or stations in the archive. The density across the globe increases
in each time interval with Australia and the United States having some of the highest concentration of stations in the archive.
Of note is the change in coverage over South America from 1940-1979 to 1980-2019; the coverage moves from the Eastern side of
the continent to the Central and Western side.
Each density plot has the same scale.</p>
<p>There are only 57 stations that record the daily precipitation (PRCP) over the enire time frame of 1860-1899.
There are 5970 stations reporting PRCP throughout 1900-1939, 13169 stations reporting PRCP throughout 1940-1979,
and 12509 stations reporting PRCP throughout 1980-2019.
</p>
<p>Menne et. al. (2012) present similar plots in their paper; however,
for our plots, a station is included in the density plot for the years 1900-1939 only if the station is active for the entire 40 years
of that time interval. The benefit of this approach is that it gives more of an indication of how consistently areas of the globe are
covered by reporting stations over time. Stations than only record data for a small time frame would be excluded from this plot. The
drawback of this approach is that it would exclude stations that report from say 1920-1970 since the endpoints do not span one of the chosen
cut-offs in the graphs.
</p>
<p>The final plot given below gives the density of stations reporting PRCP in 2018.</p>
<p> <a target="_blank" href="static/img/prcp-2018.png"><img src="static/img/prcp-2018.png" alt="Element by Continent" class="img-thumbnail" id="visualization"></a>
</p>
<p>
<cite>Menne, M.J., I. Durre, R.S. Vose, B.E. Gleason, and T.G. Houston, 2012: *An overview
of the Global Historical Climatology Network-Daily Database*. Journal of Atmospheric
and Oceanic Technology, 29, 897-910, doi:10.1175/JTECH-D-11-00103.1.</cite>
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