10 Bears

Just a bump on this. I know folk just might not be hiring ATM, but this lad is worth a shot any day of the week. If you have any possible contacts in/near Manchester, If you could please pass them on it would be appreciated. Many thanks. 10B

I can't vouch for working for these folk as I never have... But they cover your preferred areas and are generally on the look out for subbies etc They had a surveyor post advertised too, but the link is not working. Anyway... Subcontracting and Seasonal Work - Arbtech ARBTECH.CO.UK Find out how you can earn money and gain experience by working...

Hello At folk, I've recently had the pleasure of working with a lad who just needs a helping hand to get him on the way into the industry. In short, I was working for a family member in Manchester laying a patio at their restaurant getting it ready to open on April 12th. I couldn't do it alone (55m2) so I advertised for help and met this lad called Anthony (23). He immediately got stuck in, took pride in his work and grafted all day, even on the more monotonous jobs and no complaints. Overall he's a great worker. After we chatted and I got to know him more, it turns out he's really interested in tree work and climbing but currently has no way of getting involved and doesn't know where to start, so I suggested getting some experience as a groundie and to go from there. At the moment he doesn't drive, but is close to getting his licence (covid put his test dates back), so that's why I hoped someone close to the Radcliffe area in Manchester might be interested in talking to him about possible work? He did also say he could travel upto an hour from his home using bike/public transport. Anyway, if anyone can help then please get back to me and I'll exchange details. Many thanks. 10 Bears

No, I'd missed that, but seen it now cheers. I'll add a place or two that I know of shortly. Its definitely a good idea - but I'm sure thats been said already!

Cheers Steve, Yep, I'm just wandering around the pages ATM looking at all the new features you have put in. You've done a stellar job, and rightly should be proud! I bet there was some fun and games with some of the old stalwarts not enjoying the change, and I'll bet more than one thread on 'this newfangled site ain't as good as the old one...' I must look up that thread!

Hello Arbtalk, Well, things have changed around here somewhat haven't they? I have been AWOL for some time, as I think my last posts in Feb 2017 said, I have a bit of work to be getting on with... It took some time, but now I've finally finished so I'm afraid I will have the time to be gracing these pages once more. I've still got a lot on, and may do a bit more lurking then in the past, but it's going to be interesting catching-up with the happenings on here, catching-up with some of you individually, and getting used to these new pages although it does all look more impressive then the old site! All the best, 10 Bears

Interesting idea, but personally I think Da Vinci's rule would be more likely to be a factor, but some provisional calculations I did weren't too convincing so I moved on. Thanks for the comment though.

Many thanks for the advice Jules - always useful. In fact I have confirmed data on approximately 250 mature trees that are within my data set. The issue is that the wider data set contains ~14,500 trees, so my sub-sample is only representative of ~1.5% of the larger data, which could be a difficult sell. I will take a look at all my other surveys as you suggest, and focus only on the specific species I am concerned about. Thanks for the idea.

Well, what I am working with at the moment is based on the combination of a couple of metrics. There are ratios for tree height to dbh, and then for dbh to crown radius. I have combined these in to a 'working' model but there is little information on the most suitable ratio to use aside from specific species - again coming back to the concerns that Kevin had for inter-species differences. This combined approach appears OK - but I have found some errors in the model following more extensive testing.

Thanks for the tip. I have already been through a lot of the available material but there is not a satisfactory ratio that I can find.

No neck winding needed. The position of the tree would be a factor in the real world, but when dealing with a model, or ratio like this, then some assumptions are always made such as having idealised maiden tree growth. Well, Sloth, I am working on some research (hence not being on here too regularly ATM as I cant spare the distraction) where I am modelling tree locations from an observed (measured) position, and where my model would predict them to be as another dataset. Understanding the probable crown size, given a certain height, would help me use the predicted crown size as a filter, hopefully leading to a good match between the measured data and the predicted data. I'm sure that paragraph doesn't make a lot of sense, but in a nutshell, that's what this ratio is for!

Hello Kevin, Yes, there would be inter-species differences, but as I recall there was a general ratio that could be applied to broadleaf as a general rule of thumb - I just can't find the citation... I should have clarified earlier, it is a broadleaf ratio I was looking for.

Its been a while since I have been on here due to a significant workload ATM, but I'm here asking for help from my fellow AT'ers. I've had no luck finding a suitable reference for a tree height to crown diameter ratio. I know this exists as I recall reading it in the distant past, but I just cannot track it down. Even a rule of thumb example can be worked with, something like: Given the measured height of (h), crown diameter (cd) will be n or h:cd = n Does anyone in AT land recall such a ratio, and could be a great help and direct me to a citation/paper/book? Many thanks.

Arbornaught - really, its not difficult. Click this link Then repeat...

Although you may not believe it, this Guardian article however poor it may be, is founded on some clearly defined research that has influenced the NICE recommendations: Magnetic biomonitoring of roadside tree leaves: identification of spatial and temporal variations invehicle-derived particulates Spatial variation in vehicle-derived metal pollution identified by magnetic and elemental analysis of roadside tree leaves If you don't want to read all of the papers, just read the abstract. They are fairly convincing findings...