<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi Peter</div><div>We have thousands of tree data in one Hectare forest plots in different parts of Ontario.</div><div>all species over 4 cm DBH have been measured but not always for crown width as that was a later protocol</div><div>The program is called </div><div>Go Global</div><div> you can reach this data. <a href="http://www.acer-acre.ca">www.acer-acre.ca</a> and search to add more trees to your research.</div><div>Great to hear from you</div><div>Alice for ACER </div><div><br><br>Sent from my iPhone</div><div><br>On Jun 28, 2016, at 11:22 AM, Peter Duinker <<a href="mailto:Peter.Duinker@Dal.Ca">Peter.Duinker@Dal.Ca</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Darren:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">I have a graduate student measuring street trees right now in Halifax. He will end up with a couple of thousand trees measured for crown width and
DBH. We will have high-“n” regressions for estimating crown width from DBH for American elm, Norway maple, and European linden. I know already, though, that the relationships are not tight, so even with high “n”, there will be considerable uncertainty in
estimates. We can share these regressions only in September or October, when data collection has finished.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Cheers, Peter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Peter N. Duinker, PhD, P.Ag.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Professor<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">School for Resource and Environmental Studies<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Faculty of Management<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Dalhousie University<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">6100 University Ave.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Halifax, Nova Scotia, Canada
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">B3H 4R2<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Phone: 902-494-7100<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Cell: 902-229-5141<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Fax: 902-494-3728<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Email: <a href="mailto:peter.duinker@dal.ca">peter.duinker@dal.ca</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><a href="http://www.dal.ca/faculty/management/sres/faculty-staff/our-faculty/peter-duinker.html">http://www.dal.ca/faculty/management/sres/faculty-staff/our-faculty/peter-duinker.html</a></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> CANUFNET [<a href="mailto:canufnet-bounces@list.web.net">mailto:canufnet-bounces@list.web.net</a>]
<b>On Behalf Of </b>Darren Platakis<br>
<b>Sent:</b> June 28, 2016 12:00 PM<br>
<b>To:</b> Canadian Urban Forest Network <<a href="mailto:canufnet@list.web.net">canufnet@list.web.net</a>><br>
<b>Subject:</b> [CANUFNET] Relationship DBH/canopy width<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello everyone, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is anyone aware of information or a chart of some sort that indicates the relationship between DBH and canopy width for various tree species? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Eg, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Sugar maple with diameter "x" on average, has a canopy width of "y".<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I understand that this is a very over generalized question and there are multiple variables involved. I was hoping that there might be something akin to a trigonometry table available somewhere.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm looking to perform some canopy analysis and would like to create buffers representing canopy width for different tree species based on their diameters.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Any links would be greatly appreciated.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best Regards, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Darren Platakis <o:p></o:p></p>
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<p class="MsoNormal">(H)BSc. Geog., GIS (PG), FRCGS<o:p></o:p></p>
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