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about.html
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<!DOCTYPE html>
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<title>Dendrobox</title>
<link rel="shortcut icon" href="img//favicon.ico" type="image/x-icon">
<link rel="icon" href="img/favicon.ico" type="image/x-icon">
<link rel="stylesheet" href="style/style.css">
</head>
<div id="ptitle">
<img src="./img/douglass_2.jpg" width = "60px">
<a class="title" href="index.html">Dendrobox</a>
</div>
<div id="nav">
<a href="index.html" alt="back to project">⇒ home</a>
</div>
<div id="content">
<p><span class="dtext">Dendrobox</span> is an interactive
exploration tool for tree-ring data and its connection to
climate.</p>
<p>The data comes from
the <a href="http://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/tree-ring"
alt="ITRDB Website">International Tree-Ring Data Base</a>.</p>
<p>In total, 2406 tree-ring chronologies are used for this
project. This is not the complete ITRDB data set (roughly 400
series are missing), since I used only the chronologies or raw
data files which adhered the
ITRDB <a href="http://www.ncdc.noaa.gov/paleo/treeinfo.html">data
formatting standards</a> and could be read in by dplR without
errors.</p>
<p>The <span class="dtext">Chronology</span> graph shows the
standard chronology for the site. Whereever possible, the
original chronologies are used, when these were not available,
new chronologies have been built from the raw measurements,
using spline detrending (50% frequency cutoff at 67% of the
curve length, using R
package <a href="http://cran.r-project.org/web/packages/dplR/index.html">dplR</a>).</p>
<p>The <span class="dtext">Climate</span> graph shows the
climatology of the site at point, as monthly precipitation sums
(blue bars) and temperature means (red line) for the climate
normal period 1961-1990. CRU TS 3.21 gridded monthly climate
data is used, for each site the four nearest gridpoints are
interpolated using inverse distance weighting.</p>
<p>The <span class="dtext">Dendroclimatology</span> graph shows
the response functions from previous June through current
September for temperature (red line) and precipitation (blue
bars). Response functions are computed with bootstrapped
principal component regression, using R
package <a href="http://github.com/cszang/treeclim">treeclim</a>.</p>
<p>The visualization is done using <a href="http://d3js.org/"
alt="D3.js">D3.js</a>
and <a href="https://github.com/mbostock/topojson/wiki"
alt="TopoJSON">TopoJSON</a>.</p>
<p><a href="http://creativecommons.org/licenses/by-sa/4.0/"
style="border-bottom: none"><img alt="This work is licensed
under the Creative Commons Attribution-ShareAlike license."
style="border-width: 0"
src="https://i.creativecommons.org/l/by-sa/4.0/80x15.png"/> This
work is licensed under the Creative Commons
Attribution-ShareAlike license.</a></p>
<div id="footer">
Made with <span class="heart">♥</span>
by <a href="http://czang.org">czang</a>. View project
on <a href="http://github.com/cszang/dendrobox">GitHub</a>.
</div>
</div>
</html>