<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><br class=""></div><div class=""><br class=""></div><div dir="auto" style="font-family: ArialMT;" class="">The only device I’ve ever used that can get sub metre accuracy under tree canopy is the Trimble Geo 7x, as it has a built in laser rangefinder which can shoot under the tree crown to provide an offset from an accurate GPS reading. I have one and it works great, but the windows mobile 6.5 software is starting to feel very dated.</div><div dir="auto" style="font-family: ArialMT;" class=""><br class=""></div><div dir="auto" style="font-family: ArialMT;" class="">There may be other solutions that can provide a laser offset via a rangefinder linked to the GPS unit with Bluetooth, but I haven’t much experience with them. Arcpad can do this, but you’re back to the issue of generally using windows mobile again.</div><div dir="auto" style="font-family: ArialMT;" class=""><br class=""></div><div dir="auto" style="font-family: ArialMT;" class="">Best</div><div dir="auto" style="font-family: ArialMT;" class=""><br class=""></div><div dir="auto" style="font-family: ArialMT;" class="">Scott</div><div dir="auto" style="font-family: ArialMT;" class=""><br class=""></div><div dir="auto" style="font-family: ArialMT;" class=""><br class=""></div><div class="">
<div style="color: rgb(0, 0, 0); font-family: Arial; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Arial; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Scott Fairley MA(landarch) MSc(for) LMLI M.arbor.A<br class="">consulting arborist|landscape designer<br class=""><br class="">American Society of Consulting Arborists Member<br class="">PNWISA Chapter Member<br class="">ISA Certified Arborist UI-1192A<br class="">TRAQ Tree Risk Assessor<br class="">UK Licentiate Landscape Architect<br class="">UK Professional Member of the Arboricultural Association<br class="">UK Professional Tree Risk Assessor (PTI) LANTRA Awards<br class=""></div><div style="color: rgb(0, 0, 0); font-family: Arial; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Arial; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><a href="mailto:scott@treesandlandscape.com" class="">email: scott@treesandlandscape.com</a><br class="">web: www.treesandlandscape.com<br class="">Tel: 1-(778)-583-6098</div></div><span style="color: rgb(0, 0, 0); font-family: Arial; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class="Apple-interchange-newline" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Arial; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Arial; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"><span><span><span><img apple-inline="yes" id="D03C41B9-E67B-4403-B4FD-BCC06EBAC6FF" src="cid:6C933FB8-936E-4C1A-82D6-99D83BE53C11@telus" class=""></span>
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<div><br class=""><blockquote type="cite" class=""><div class="">On 5 Nov 2018, at 18:30, Maurice, Jerome via CANUFNET <<a href="mailto:canufnet@list.web.net" class="">canufnet@list.web.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Hi Canufnet,<br class=""><br class="">I came across a recent discussion about tree geolocation tools used by some urban foresters (see below). Based on practical experience, is anyone able to recommend one or more devices that are highly accurate (+/- 20cm) for tree inventory ? what would be a reasonable target under closed canopy cover (20cm ? 50cm ? 1m ?)<br class=""><br class="">Thanks a lot.<br class=""><br class="">Jérôme Maurice, Ing.f. M.Sc.<br class=""><br class=""><br class="">-----Message d'origine-----<br class="">De : CANUFNET [<a href="mailto:canufnet-bounces@list.web.net" class="">mailto:canufnet-bounces@list.web.net</a>] De la part de Art Maat via CANUFNET<br class="">Envoyé : 19 janvier 2017 17:35<br class="">À : Marie-Hélène Sauvé; Canadian Urban Forest Network<br class="">Objet : Re: [CANUFNET] tree protection<br class=""><br class="">Mobile software is available from Histree for plotting and or surveying tree locations with species, condition, images and other variable attribute data in field. <br class=""><br class="">As well GPS hardware is available and can connect to Android or iOS devices via Bluetooth resulting in sub meter accuracy point locations. Additionally using Histree and on board satelite views a user can also visually reference a location by moving the map while the pin is stationary. Much like Uber interface. <br class=""><br class="">Regards,<br class="">Art Maat<br class="">780-937-4056<br class=""><br class=""><blockquote type="cite" class="">On Jan 19, 2017, at 3:08 PM, Marie-Hélène Sauvé via CANUFNET <<a href="mailto:canufnet@list.web.net" class="">canufnet@list.web.net</a>> wrote:<br class=""><br class="">Hi there,<br class=""><br class="">Just to adjust something about GPS and urban forestry: there exists many<br class="">types of devices that are accurate enough (+/-10cm precision) to make a very<br class="">good distinction between two trees located nearby (and even the property -<br class="">if it's a public tree or not). Those devices are way more expensive than<br class="">those easy-to-use Garmin or other GPS device used traditionally in forestry.<br class="">Those high-level precision GPS are used by some consultants in the Greater<br class="">Montréal. So YES, it may be used and applied. The user has to know how to<br class="">use it properly though; GIS skills are required!<br class=""><br class="">Cheers,<br class=""><br class="">Marie-Hélène Sauvé<br class=""><br class=""><br class=""><br class="">-----Message d'origine-----<br class="">De : CANUFNET [<a href="mailto:canufnet-bounces@list.web.net" class="">mailto:canufnet-bounces@list.web.net</a>] De la part de via<br class="">CANUFNET<br class="">Envoyé : 19 janvier 2017 13:12<br class="">À : <a href="mailto:jd@dunster.ca" class="">jd@dunster.ca</a>; Julian Dunster; Michael Richardson; Canadian Urban Forest<br class="">Network<br class="">Objet : Re: [CANUFNET] tree protection<br class=""><br class="">Unfortunately GPS is not accurate enough to plot trees, especially when<br class="">landmarks that are accurately located by a surveyor aren't close by (i.e. a<br class="">forest or large natural area). GPS's currently available don't have the<br class="">resolution to separate two trees that are 2 feet apart, or may be on the<br class="">other side of a property line with 100% accuracy. A critical point. It's a<br class="">help but not the solution, yet.<br class=""><br class="">CAD and GIS are great for plotting the data (we use both) but the locations<br class="">need to be accurate to start with. The days of drawing-in a dot by hand on a<br class="">site plan are gone.<br class=""><br class="">Stephen Smith<br class="">ISA Certified Arborist, Urban Forester<br class="">Urban Forest Associates Inc.<br class="">-----Original Message-----<br class="">From: Julian Dunster via CANUFNET<br class="">Sent: Thursday, January 19, 2017 11:56 AM<br class="">To: Michael Richardson ; Canadian Urban Forest Network<br class="">Subject: Re: [CANUFNET] tree protection<br class=""><br class="">Many of arborists in Britain regularly use GPS, GIS, and CAD routinely for<br class="">development projects. One of them developed special CAD software for the<br class="">purpose. The lack of its use in Canada almost certainly reflects a lack it<br class="">being taught in curricula, as part of professional practice. We still focus<br class="">on pruning, planting, fertilising and tree stuff, all of which is fine but<br class="">needs expanding to the 21st century to include effective use of technology.<br class="">Several of my colleagues in BC use CAD all the time. I use GPS and GIS.<br class=""><br class="">We need to expand the horizon of what arboriculture and urban forestry might<br class="">/ should entail. At the same time we can also inform surveyors and<br class="">architects of we expect them to produce - such as CAD symbols for canopy<br class="">that are scaled to reality on the ground, not simply rubber stamped on a<br class="">plan, all at the same size (a pet peeve).<br class=""><br class="">On Behalf of Dunster and Associates Environmental Consultants Ltd.<br class=""><br class=""><br class="">Dr. Julian A Dunster R.P.F., R.P.P.., M.C.I.P., ISA Certified Arborist, ASCA<br class="">Registered Consulting Arborist # 378, ISA Tree Risk Assessment Qualified BC<br class="">Wildlife Danger Tree Assessor Honourary Life Member ISA + PNWISA<br class=""><br class="">North American distributor for Rinntech<br class=""><a href="http://www.dunster.ca" class="">www.dunster.ca</a><br class=""><br class=""><blockquote type="cite" class=""><br class="">Some interesting thoughts here.<br class=""><br class="">Those little dots; most arborists I know do not have the equipment or <br class="">expertise to to locate trees with any precision, nor the GIS software <br class="">to plot them. If an arborist is using a plan created by a surveyor <br class="">than surely the arborist must locate and plot not the tree, but the <br class="">entire trunk diameter or root collar/trunk flare with the same <br class="">accuracy and precision.<br class=""><br class=""><br class=""><br class=""><br class=""></blockquote><br class=""></blockquote></div></div></blockquote></div><br class=""></body></html>