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relativescale.htm
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relativescale.htm
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd"> <HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Author" CONTENT="Paul R. Sheppard">
<META NAME="GENERATOR" CONTENT="Mozilla/4.05 [en] (Win95; U) [Netscape]">
<META NAME="KeyWords" CONTENT="dendrochronology, tree ring, crossdating, skeleton plot">
<TITLE>Crossdating: Relative Scale</TITLE>
<script src="MoveCore.js"></script>
<link href="MoveCore.css" rel=stylesheet>
<LINK REL=stylesheet HREF="crossdatestyle.css" TYPE="text/css">
</HEAD>
<BODY>
<H1>Relative Scale of Skeleton Plots</H1><BR>
Trees living within a homogeneous stand or forest:
<UL>
<LI>Usually exhibit the same relative pattern of growth variation through time, <EM>BUT</EM>
<LI>Often have absolute growth rates that differ substantially due to living in different microsites:
<UL>
<LI>Difficult to compare the ring-growth variation of two or more specimens from actual wood samples
<LI>For example, see figure:<P>
<CENTER>
<IMG SRC="relative.gif" WIDTH="620" HEIGHT="210" ALT="three cores with different growth rates"><P>
</CENTER>
<OL>
<LI>All three samples above have exactly the same pattern of variation
<LI>Top sample has a growth rate less than that of the middle sample
<LI>Middle sample has a growth rate less than that of the bottom sample
</OL>
</UL>
</UL>
<EM>Problem</EM>: Because of different growth rates, it's impossible to align the common pattern of variation using the actual wood samples<BR><BR>
<EM>Solution</EM>: Dendrochronologists can make <EM>skeleton plots</EM> to standardize scales:
<UL>
<LI>Represent growth variation of samples onto separate strips of graph paper
<LI>Equalize the absolute scales ring growth
<LI>Easily compare growth variation of two or more specimens
</UL>
Note the three skeleton plots of the figure above:
<UL>
<LI>Have the same relative scale
<LI>Easy to compare to one another
<LI>Clearly show the same pattern of variation of each sample:
</UL>
<CENTER>
<TABLE>
<TR><TH COLSPAN="1">When <A HREF="SkeletonPlot18.htm">you try skeleton plotting for yourself</A>, you can move the virtual core left and right: <P></TR>
<TR><TD>
<!--<APPLET code="MoveCore.class" WIDTH="600" HEIGHT="65"></APPLET>-->
<div id="appFrame" >
<canvas id="coreStrip" onmousedown="startDrag(event)" style="left:10px"></canvas>
<div class="appBorder" style="left:0px;top:0"></div>
<div class="appBorder" style="left:598px;top:0"></div>
<span style="position:relative; top:45; font-weight:900"><==== Move core left or right ====></span>
</div>
<script>
appInit();
</script>
</TD></TR>
<TR><TD>
<UL>
<LI>Put the cursor anywhere on the core above
<LI>Click and hold the mouse button
<LI>Move the mouse left or right
<LI><EM>Don't worry</EM> that the core goes off the edges -- it always comes back!
</UL></TD></TR></TABLE><BR>
<EM>Note</EM>: The virtual core comes with every 10th ring prenumbered -- which won't be true in real life, so number your wood carefully!<BR><BR>
<TABLE>
<TR><TH COLSPAN="3">When <A HREF="SkeletonPlot18.htm">you try skeleton plotting for yourself</A>, you can change the scales of the graphics:</TR>
<TR><TD><IMG SRC="magnifications.gif" WIDTH="120" HEIGHT="120" ALT="magnification options"></TD>
<TD>
<UL>
<LI>There will be magnification circle buttons, as on the left
<LI>You may enlarge or reduce the virtual core to see rings better
<UL>
<LI>Choose between 1x, 2x, or 3x
<LI><EM>Hint for magnifying a ring</EM>:
<OL>
<LI>There will be a vertical blue line marking the middle of your screen, as on the right
<LI>Put the ring that you wish to see better at the blue line
<LI>Then magnify -- at 3x magnification, narrow rings are apparent
</OL>
</UL>
<LI>You may also enlarge or reduce the graphs
<UL>
<LI>Choose between Large, Medium, and Small
</UL>
</UL></TD>
<TD><IMG SRC="zoom.gif" WIDTH="109" HEIGHT="131" ALT="zoom magnification"></TR></TABLE><BR>
<HR>
<A HREF="plotting.htm">Previous Page</A> |
<A HREF="masterchronology.htm">Next Page</A><BR>
<A HREF="introcrossdate.htm">Introduction</A> |
<A HREF="applications.htm">Dendrochronology Applications</A> |
<A HREF="exampleapplication.htm">Crossdating Application</A> |
<A HREF="ringanomalies.htm">Ring-Growth Anomalies</A><BR>
<A HREF="sensitivitycomplacency.htm">Sensitivity-Complacency</A> |
<A HREF="plotting.htm">Skeleton Plotting</A> |
<A HREF="relativescale.htm">Relative Scale</A> |
<A HREF="masterchronology.htm">Master Chronology</A><BR>
<A HREF="patternmatching.htm">Pattern Matching</A> |
<A HREF="findingdates.htm">Finding the Dates</A> |
<A HREF="absentfalse.htm">Absent/False Rings</A> |
<A HREF="SkeletonPlot19.htm">Try Skeleton Plotting for Yourself!</A><BR>
<A HREF="http://www.ltrr.arizona.edu">Laboratory of Tree-Ring Research</A>
</CENTER>
<HR>
<ADDRESS>Paul R. Sheppard<BR>
Laboratory of Tree-Ring Research, The University of Arizona<BR>
Tucson, Arizona 85721 USA<BR>
office: (520) 621-6474, fax: (520) 621-8229<BR>
Comments to: <A HREF="mailto:sheppard@ltrr.arizona.edu">sheppard@ltrr.arizona.edu</A>
</ADDRESS><BR>
Copyright © 1998, Laboratory of Tree-Ring Research, The University of Arizona<BR>
Revised -- December, 1998<BR>
URL: <A HREF="relativescale.htm">http://tree.ltrr.arizona.edu/skeletonplot/relativescale.htm </A>
</BODY>
</HTML>