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About Amelanchier

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    Site Moderator, Raffle Sponsor 2007, 2008, 2009, 2010, 2011, 201
  1. Ah, I meant that with regard to your initial database of contacts. Be careful not to populate your research with too many opinions of the'good people' - it may not give you a representative sample. Those that are proactive respondents might well be proactive with TPO administration. Or worse, bearing an axe for grinding. As for FOI requests being a pain - well, I don't know what to say. Perhaps we should just get rid of them and go back to the good old days...
  2. Have you considered utilising FOI requests? https://www.gov.uk/make-a-freedom-of-information-request/the-freedom-of-information-act
  3. Root pruning

    You see that's the problem with simplification. One size does not fit all. We also get adventitious bud formation in callus tissue. Especially in species with low populations of dormant or latent buds e.g., Fagus sylvatica. Tree Roots In The Built Environment: Research For Amenity Trees 8 by Roberts et al presented the attached model for root regrowth post severance based on their analysis of the work of Gary Watson. They maintain that the primary source of new root buds is callus tissue which differentiates from the exposed cambium post injury.
  4. Root pruning

    I've actually done a little bit of original research work on root severance response since I started this thread (eight years gone in the blink of an eye David!) and I think best practice has this a bit wrong. We normally specify small clean cuts in the canopy to minimise the available colonisation surface and to ensure our nice pruning work isn't overrun by epi within a couple of years. And when we do want a vigorous growth response we might work in a bit of natural fracture veteranisation (acknowledging that we probably increase the decay risk). All this is, of course, is just controlling the amount of exposed cambium. More exposed cambium typically means more meristem differentiation and more regrowth. Less normally equals less, and in that respect roots are no different from branches. But as Guy notes above, roots compartmentalise far better than branches or stems so unless we are right up to the structural stuff we shouldn't really worry about facilitating decay (with the caveat that common sense still applies - we should probably leave the last Cat A trees in a group that was decimated by Armillaria alone, mentioning no names Devs & LPAs ). So the pruning spec should come down to what growth response we want. As it stands, the guidance doesn't let us do that. Personally, I find few occasions where I don't want cut roots to re-grow as well as possible. After all, we've just sanctioned the loss of a technically unknowable volume of roots so letting the tree regenerate as much as possible is likely to be pretty important. With that in mind and provided that the goal of the severance is achieved and its re-occurrence abated, do I really want a nice small clean cut with minimal cambial exposure? Assuming David's duff Ash were of a bit better quality, I'd be tempted to say that we should look to underpin the wall with a nice big block of concrete or similar (there's a proper root barrier for you) and smash the root out with a digger... How's that for out of the box Paul
  5. Green ash.

    You're entirely on the right track. Fraxinus is within the same family as the Olives (Oleaceae) and stores much of its energy as oleic acid - the same fatty acid that is a major component of plant oils and animal fat.
  6. Planning Portal and the dot

    You're talking about the file extension right? As in example.doc or example.pdf? That's native to all three main operating systems - it's not a special mac thing sorry. I upload files with extensions shown all the time so it's unlikely to be your problem. Extra full stops in a file name can be a problem on any OS (yes, that includes mac, they don't 'just work'.) though so try to avoid filenames like example.plan.pdf. And whilst it is often the case that the uselessness of an Govt. IT system is directly proportional to the amount of public money spent on it, I also think it's unlikely to be the case that a website "couldn't cope" with your computer. You wouldn't say a book couldn't cope with its reader or that some music couldn't cope with you listening to it. (Well you wouldn't unless you owned a mac...)
  7. Free quantified tree risk assessment method

    Humour me. I can only think of two ways in which QTRA (the system) would arise in discussion; in a discussion on the facts or in a discussion of the merits of those facts. In either discussion, there is the potential for dispute - for example Acer may disagree with your assessment of what constitutes a fact about QTRA and would be in a position to complain that you have misrepresented the system on a public forum. Similarly it is not too hard to imagine that he may also disagree with your opinion on them. In either event it would be unfair of me to to prevent him from responding - just as it would be if I prevented your comments on QTRA from being heard elsewhere on the site. So I can keep the thread on track provided we don't enter that territory or we can just allow arbtalk to do its thing and you'll have to put up with the involvement of one or more critical voices and derailing by people who like the idea but will never help you move it forward beyond a protest against what's there already. With regard to your caveat - wait til you've posted something that needs it!
  8. Free quantified tree risk assessment method

    Here's what we're going to do - we're going to start again. Sort of. This time though, consider this your part of the sandpit where you are free from the callous pernicious tactics of the intergalactic hegemony of the evil QTRA empire. Free to stand tall and proud; free to muse on the suitability of different acronyms and the value of a statistical life (or part thereof); free to reinvent the wheel if you so choose... Free to stick it to the man and bring down the system. I'll be here supervising and I'll delete all off topic threads. One condition though. No discussion of QTRA . Otherwise I'll be obliged to offer a right to reply. Solomon himself couldn't be fairer.
  9. The End of Gas for new homes

    I suspect your stove installer is suffering from a combination of Chinese whispers and wishful thinking. There simply is no plan to ban gas for new homes. Homes built from 2016 will be free to have gas as an energy source but they will have to meet the stricter efficiency targets of the zero carbon homes policy and its related regulations. Its light on sensationalist sound-bites but the facts (damnable accursed facts) are here. http://www.parliament.uk/briefing-papers/sn06678.pdf Perhaps the stove supplier / fitting industry should stick to to their usual shtick of predicting an imminent ice age rather than making up disprovable govt. policies.
  10. Ah it was low hanging fruit. And a way of avoiding the question! Isn't the probability of 15 out 30 coins (yet to be tossed ) ending tails up is whatever proportion of combinations that makes up out of all possible combinations? So 2^30 gives us the number of possibilities and 30!/(15!*15!) gives us the number of those possibilities that contain 15 tails so (30!/(15!*15!)/(2^30) giving us P=0.14? That is kind of my limit with numbers though so tread softly, because you tread on my dreams.
  11. P=0.63 would mean that your guy would be more likely to guess ten tosses than one toss? But there's the rub. The chances that one person in 1024 (ten rounds of one-on-one) can correctly predict the outcome of ten consecutive coin tosses is pretty far out there P=0.00000095367431640625 ((2^10*(1/1024) I think?) but structuring the event in a tournament means that the probability of one person out of the competing 1024 doing so is P=1... The artifice re-frames the probability - someone has to win (all other things being equal) so the otherwise unlikely outcome is certain. It makes me wonder if we don't make that subtle shift sometimes with trees.
  12. I would imagine that as the event has already happened the probability is 1. As an aside (like you guys need an aside right?), I can show you someone who will correctly guess the outcome of ten consecutive coin tosses in the order that they happen. All I need are 1024 (2^10) volunteers and a ten round tournament. Winner correctly guesses the toss and moves on - loser weeps into his beer over what could have been. The probability of any one sequence of tosses is 0.0009765625 but the probability that the winner (one person in just over a thousand) correctly guesses that sequence is 1... Thirty rounds is possible but a little impractical (2^30) - you'd need just over a billion people.
  13. GPS / PDA / Data Capture?

    Thankfully, it is a rare day that I survey anything in the rain. We also have a company policy on low temps insofar as we operate reduced survey durations during cold spells (anything with a met-office "feels like" temp of below 0 degrees C). On the whole I've found clients quite reasonable with explaining those kind of delays - I think it safe to say that I have it easy and am not likely to relocate to compete in your area! Yep discontinued but still plenty available on ebay etc. I don't think it could log GPS co-ordinates natively but there is still quite a back catalogue of freeware that might be capable; e.g., Free Top 10 Windows Mobile 6.1 Classic GPS Downloads In short - no. But I found the support staff reasonably helpful when I sent them my bloated efforts by email.
  14. GPS / PDA / Data Capture?

    Regarding the weatherproof issue, I have just realised that I am lucky enough to undertake over 90% of my work within the driest region in the UK. Others may not be so lucky and you truly have my sympathies The Touch 3G can sit in a clear drybag like this one https://www.alpkit.com/products/aqua-wallit with no impact on the functionality of the touchscreen.
  15. GPS / PDA / Data Capture?

    We run Pocket GIS on old HTC phones (Jade / Touch 3G) and then upload to Pear technology's PTMapper PRO and then to AutoCAD LT 2007. Can't recall all the prices but PGIS was £500, PTMapper PRO is about £750, AutoCAD LT2007 often goes for about £400-500 second hand on ebay and the HTC Touch 3G is about £50 BNIB. Accurate and quick GPS, robust enough to handle knocks, bluetooth to link with our trupulse, lightweight, easily recharged and cheap enough to not worry about being too precious with it. You can even use it as a phone... It's not waterproof but then who wants to be surveying in weather bad enough to test that? Not me anyway. So all in = £1800. I wrote my own translation schemes and survey themes using PGIS when we had it at the council. Days of my life I'll never get back. We now have PTSurvey which IIRC comes free with the PTMapper software - its basically a third party GUI for writing survey templates in PGIS and it's childlishly simple. I can make a custom survey template, and have it uploaded, tested, debugged and ready to go out on site within twenty odd minutes.


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