Online Calculator| Revised Burnley Method of Tree Valuation

Ekka

World first! I just built this online calculator for the Revised Burnley Method of Tree Valuation and would like some feedback. I'm yet to reduce decimal places to 2 digits but it appears very accurate. The PDF pertaining to this method of Valuation is also attached here.

Enjoy

Attached Files

Revised Burnley Method of Tree Valuation.pdf (13.8 KB, 178 views)

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stirmantrees

excellent contributer you are to our profession eric. i unfortunately, at this time would not know where to begin using this. Nonetheless,

interested to see the feedback from those that are more aquainted with this procedure.

a_lopa

Bookmarked a very useful tool

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Ekka

It's two decimal places now and working sweet, had a javascript coder look over it.

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banner

Impressive work, but what does it really mean Eric?

Is the the value added to your property value?
Does speices of tree affect the base factor?
Etc..........? I'll google up what I can to answer my questions.

Ekka

It's a method, one of many, that values a tree.

Just read the PDF in the first post, explains it all but is a little confusing on the formula as it covers the older version first where they calculated differently, then they adjusted it later to what the calculator does now.

The calculator takes into consideration a number of factors that discount the value, species is part of it as is longevity, structure and health.

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axe

never knew they had such a thing very interesting good work!!

trees3111

Very interesting stuff Ekka. Thanks for the form email bringing it our attention. Here in the states I have never seen that. We only use Replacement Cost and Trunk Method. Trunk Method also has a "Fudge Factor" for larger diameter trees. I wonder if the method you posted has replaced the use in Australia of the above methodology I mentioned??? I plugged in a hypothetical tree but I don't understand how one comes up with $/M3. Perhaps on a local table as we would to get our species% value modifier for the above methods. When I ran my hypothetical tree and played with the numbers it appears that the $/M3 must be low figures in the order of $.05-$.10 US dollars. Perhaps I have this all screwed up though and I missed something that explained how to get $ after the 1 is placed in the $/M3 box and volume is gained. I would like to use this as a quick calc to give a client a rough idea of value so they know if they would like to proceed with hiring us to appraise the tree(s) using a method that would hold up in court. Many people hear the cost of an appraisal and do not want to proceed as they fear they will not be able to get the money back if they lose in court. Thanks. Love this forum when I get the chance to look at it!

Ekka

$m3 is simple, it is the average price of buying whatever species you are valuing from nursieries today. What does it cost to buy 1m3 of tree today.

So if a 25 litre potted Flame tree had 1m3 of volume and it cost $30 then that's your base rate (30), simple and uniform for every species and self adjusting for inflation.

You do not have to go searching nurseries for 1m3 canopy sized stock either. Take the plants measurements, here's an example.

300mm potted Flame Tree, it's only 0.8m high and radius of canopy is 0.25m ... and costs $10

So the volume is 0.05m3

$10/0.05= $200m3

You will find large trees valued in the $100K+ range no worries.

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glennak

One of the troubles using this method using cones for both base value and tree valuation is it is a lot of calculation for nothing. It would be the same $ value using cylinders, spheres or square prisms. Which is fair enough but the base value is suposed to be a cylinder even though it was written incorrectly by Greg Moore. The only change that was meant to happen with the Revised Burnley Method from the original Burnley Method was to remove the shape factor and pretend all trees to be valued are cones.
The only practical way to value trees is to have a standard set of values for species. Either $/square cm trunk cross sectional area DBH or $/cubic metre of foliage. Who is going to pay someone to value trees if for every species you had to find 3 nurseries growing large specimens then go to them and measure the trees. I have done this and some nurseries have their trees staked in the pots (which in my opinion makes them close to worthless) and they have huge canopy volumes for their age. This makes the species cheap others with good tapered trunks and small volume make the species expensive, if they were the same price/tree. With trunk cross sectional area the opposite would be true.
We need an Australian standard for tree valuation and someone like the ISA to keep a list of valuations.
Originally the Burnley method had standard values for species. This was rubbished at the time because Pinus radiata was the most expensive tree / volume because the only reason they are sold in pots is for Christmas trees.

Ekka

So what you are saying is that the mature tree we are valuing we use the cone but for the nursery specimen we use the cylinder.

Either way it doesn't affect the way the calculator works, it affects the base value figure, the formula within the calculator is correct.

Perhaps provide both figures? The issue I have is validation of what is correct from legitimate authoritative sources, not saying you are wrong or your sources but some-one somewhere has to put an official statement out about it.

You don't have to find mature specimens from nurseries either, just measure up any old one and extrapolate. If they have heaps of 200mm potted for $10 calculate the volume and multiply it up to get a 1m3.

The biggest problem is finding the tree stock.

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glennak

No Eric if you read on the top of page 2 in the revised burnley method you will see that the base value trees need to be at least 1 cubic metre as a cylinder.
I can understand your trouble with the bottom of page 4 where it says base value using cone. This is a total contradiction, next time I see Greg I will see what can be done to change this or just get rid of that paragraph. If you believe page 4 rather than page 2 the trees are worth a 1/3 of the value.
Yes your calculator works fine and it is just the base value that is the problem.
I'm liking your site thanks but I have a lot of trouble reading the image verification.

Ekka

I'll correct you. I have no trouble, my comprehension is great and I have clearly interpreted the text to what it states at the bottom of page four. If that is not correct then the trouble lies with the University and the author doesn't it.

Yeah be good if Greg can clear it in writing.

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