Chile Trip Part 2: Parque National Vicente Perez Rosales

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#21)  Re: Chile Trip Part 2: Parque National Vicente Perez Rosales

Postby KoutaR » Fri Jan 27, 2017 2:20 pm

I can only say that when "superalberi" has measured tall European trees, which have also been measured by others, the results have been rather close. A few examples from his recent Portugal trip:

http://www.monumentaltrees.com/en/prt/c ... nas/23690/
Eucalyptus globulus, 63.1m by superalberi, 62.4m by John Weightman in 2015.

http://www.monumentaltrees.com/en/prt/c ... anas/8327/
Eucalyptus viminalis, 62.3m by superalberi, 65m by Dean Nicolle in 2010.

http://www.monumentaltrees.com/en/prt/c ... anas/8314/
Eucalyptus diversicolor, 73m by superalberi, 72.9m by Syd Howells in 2015 (the latter with climbing & tape). The tallest tree of Europe.

http://www.monumentaltrees.com/en/prt/c ... saco/6443/
Eucalyptus regnans, 64.9m by superalberi, 64.5m by Dean Nicolle in 2010.

And one tree from Canary Islands:
http://www.monumentaltrees.com/en/esp/c ... flor/3482/
Pinus canariensis, 55.5m by superalberi, 55.6m by Nardo Kaandorp. I got 56.7m with TP 200X but I am sure superalberi and Nardo have missed the tallest twig, which is hidden by other twigs when looking from the most obvious measuring place. See http://www.monumentaltrees.com/en/photos/56161/ and the comment below the photo.

It is also possible that superalberi has marked a false point on the map, either accidentally or if he cannot locate the place on the map. Myself I don't have a gps unit and sometimes have to guess the right place but I then write in the description "the location is not exact".

However, I must say that the credibility of "superalberi" is slightly decreased by the fact that he does not answer to messages. For example, I have tried to ask, which laser unit he uses without an answer. I will send him a message and ask if he wants to comment this discussion.

"superalberi"=Andrea Maroè, here his/their website: http://www.superalberi.it/?lang=en)
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#22)  Re: Chile Trip Part 2: Parque National Vicente Perez Rosales

Postby KoutaR » Tue Jan 31, 2017 9:12 am

"superalberi" answered after I noted he can also write in Italian. We had a good discussion and it came out he don't partecipate in discussions because his English is not very good.

"superalberi" is not only Andrea Maroè but a group of arborists. Mr. Maroè leads the group and supervises their measurements. When measuring with laser (they use Nikon Forestry Pro) they always intend to use 2-point sine method but Mr. Maroè is not always 100% sure what his collagues do. This is the case with Chilean trees: They used the sine method but there is a possibility that at some trees the 3-point measurement was accidentally selected. Some trees they have apparently measured intentionally with the 3-point method because the top couldn't be seen well, as they have marked some trees with "tangent-style".

He also said the points on the map may not be exact.

They prefer to do tape measurements but it is not always possible.

Btw. the name has double meaning: "super alberi" = "super trees" but also "su per alberi" = "up for trees".

Kouta
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#23)  Re: Chile Trip Part 2: Parque National Vicente Perez Rosales

Postby fooman » Tue Jan 31, 2017 4:29 pm

Unfortunately, some of Andrea's tape drops are suspect as well.  He did an unauthorised climb of a large kauri at the Cascade Kauri Regional Park - one at the northern end of the Auckland City loop track - and spend the night in it (http://superalberi-messaggeroveneto.blo ... i-i-parte/).  He measured a tape drop of 52.4 m (http://www.monumentaltrees.com/en/nzl/n ... ionalpark/).  I had actually lasered this particular tree at around 35 m, then found his reference, went back and double checked - got the same result, 35.7 m.  The Auckland LIDAR data has it around 38 m - it is at the top of a slope, so there is an overhang error.  He also measured the diameter at over 3 m - it's not much over 2 or 2.5 m (not checked to avoid PTA/roots etc).  There actually is a tree around 50 m tall, but near the other end of the loop track - that could only be measured by Lidar, without climbing it, as it is on a steep slope and surrounded by dense undergrowth.

It is a shame, because if the tree was as tall as he said, it would be one of the tallest remaining.  Unfortunately, as it is, it is just a nice, easily accessible example of the species.

Cheers,
Matt
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#24)  Re: Chile Trip Part 2: Parque National Vicente Perez Rosales

Postby KoutaR » Mon Feb 06, 2017 7:05 am

Matt,

I asked Andrea for a comment. He said he measured it with direct tape drop alone, so it's possible that he made some small error but not so much as you said. He has also tried to join NTS but for some reason the registering did not function.

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