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Types of tree valuation systems
I am currently researching tree valuation systems. Could anyone supply me with names and where i could recieve copies or extracts of these systems, and any research completed on them. So far I know about the Helliwell system and CTLA.

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<Scott Cullen>
Reply to post by Jude, on January 29, 2001 at 04:59:53:


Here are some valuation methodologies, I don't have contact names or addresses.

The standard in Germany seems to be Methode Koch. Try a web search on that. The 7th Edition Guide for Plant Appraisal (and maybe 8th) cited a 1978 book by Bernatsky that had "ecology" in the title I think. There was a chapter that talked about tree value and another German methodology.

There are two methods used in Australia. "Thyer" or "Thayer" and the "Burnley" method. The former I think by an individual author the latter by the Burnley College of Agriculture, University of Melbourne. Do web searches on those you should find something. I heard these are also used in NZ and that there is a homegrown NZ method but was never able to find anything on it.

There was supposed to be a Helliwellish method in Ireland by somebody named Barry.

I heard there is a Spanish method but never found anything.

As nearly as I can tell these are mostly if not all replacement cost (perhaps depreciated like CTLA) approaches to value. I have not really seen Helliwell though.

There have been US methodologies that vary from CTLA in that while they are replacement cost approaches they are weak on depreciation and focus on large, full scale replacements. There were some unpublished papers by Alden Kelly in California in the late 80's. This type methodology seems to be making a comeback as there are more readiliy available data about actually moving very large trees.

You proably should be looking at the possibility of benefits approaches that are most represented by the USDA FS work of McPhereson, Nowak, Rowntree et al. While they are called "cost/benefit" approaches they are not the same as replacment cost approaches. Look at CityGreen from American Forests and associated literature.

Market approaches which are alluded to in 9th Edition also appear from time to time in the literature. These try to back the contribution of landscapes, or plants or single plants out of real estate market prices. What appears in only one of the anecdotal studies I've seen is that this will vary by geographic market and sub-market, by price point within market and and by market timing (strong vs weak). There are citations in 9th Ed.

And there may be some crossover from natural resource valuation approaches in valuing urban forests on a municipal or regional rather than single tree scale. Contingent valuation or travel cost models might be employed.

That should get you started.
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<John P Sanborn>
Reply to post by Scott Cullen, on January 29, 2001 at 04:59:53:

Methode Koch-
There are severeal with Baumpflege in the search text, but my german is limited to ordering beer and asking where the toilet is.
This is the only page that came up I could remotly understand, WERNER KOCH (23.4.1927 - 28.4.1993)
It has an email tag to


For the "Burnley" method I get the sylibus for Aus. arborist coarse. I sent ann email to the school contact on the SSA page asking for a point in the right direction.

Thyer meathod got me to Peter Thyers site with a description of the meathod and purpose.

The method allows the calculation of monetary values for trees and shrubs.

>>It was designed to value trees on public or
>>community owned land in city, town and suburban
>>locations. It can also be used to value amenity
>>trees on private land.

>>It is not intended for use within bushland areas,
>>or on rural land except near residences.

It also has an e-mail link to Peter Thyer


No Joy on Helliwellish or Helliwell


Bernatsky- I searched the Milwaukee federated library system and by author, No Joy there also.


Now I gotta get my longjohns out of the dryer and go to work.
We have a heat wave, it's 34 degrees.
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<David Baird>
Reply to post by Scott Cullen, on January 29, 2001 at 04:59:53:

Yes there is a New Zealand method of tree evaluation. Called STEMs, Standerd Tree Evaluation Method. It is very effective and more info can be found at the NZ Arboriculture Web site or give me a mail and ill send the link. It is a good easy to use system, I have beeen using it all year and have done over 1600 tree as part of my job compiling a list of trees to be protected on the Dunedin District Plan.
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<Philipp Fahr>
Reply to post by john p sanborn, on January 29, 2001 at 08:14:20:

Hello !

Does someone know where Peter Thyers webpage has moved to ?
Or - even better - could someone pass me on his e-mail, so I could contact him directly ?
Many thanks,
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<Peter Thyer>
Gooday Philipp,
Strange to find a message from you here. I hope all is well and hope to get some news from you soon.
My direct email is <<>>
My save the world web site is <<>>
The tree valuation website address was slightly changed by the provider but can now be found by a Google search for "Thyer Tree Valuation".
For tree valuation people: there is a rich worldwide history of tree valuation, and a lot is still happening. In 2005 Australia is attempting to establish a national standard for tree valuation. Current contenders are the Thyer, Burnley, Australian Standards 1992 Draft, and the ISA/CTLA Trunk Formula methods. In 2003 I developed a specialised tree valuation method for the City of Sydney, designed to value trees on public land and to value the 'community component' of benefits of trees growing on private land. A good comparison of some valuation methods was written by Gary Watson and published in the ISA journal. Mark Garner, School of Forestry, Australian National university, wrote a very good thesis in 1999 comparing 6 tree valuation methods, particularly assessing reliability and repeatabilty.
It would be great if someone wrote a world history of tree valuation.
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Hello Peter Thyer. I'm a graduate student in forestry, University of Chile, Santiago of Chile. and I 'm working on types of evaluation methods, for my thesis. Maybe you can help me, because I need to find the Mark Garner's work, called "Determining an appropiate protocol for amenity tree valuation in Australia, 1999". I searched in online universities libraries of Australia, ANU, and didn't find nothing at all. Neither in online Thesis. If you Peter or somebody else could help me y would be very gratefull. My e-mail is or
Thanks a lot and see you soon. Cristián Fuentealba
Posts: 1 | Registered: Thursday April 13, 2006Report This Post
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