Crown Spread Edward Frank Jan 11, 2006 18:15 PST
 Ed I have always wondered why spread doesn't get any respect. With the current Big Tree formulas, spread is heavily discounted. If you are looking for "Big" trees, and one has a 135' spread, doesn't that say something about that tree? Compared to another of the same species? I am guessing that the Big tree points originated with those who tallied board feet, and not overall mass (volume?) I would be interested in ideas that included full points for average spread at least. Scott
 Crown spread techniques Robert Leverett Jan 12, 2006 11:41 PST
 RE: Crown Spread edward coyle Jan 12, 2006 13:49 PST
 Ed, The simplest method is to measure maximum spread. One measurement. It might take several tries to get the maximum, but that is no different than finding the highest branch. No averaging of anything. Unless we are considering averaging the three tallest points on a tree to obtain the height! The maximum spread, as is the greatest height, should be considered the absolute. It is not necessary to mimic the AF technique. Ed C
 Re: Crown Spread Jess Riddle Jan 12, 2006 18:24 PST
 Ed, Ed and others, I'm beginning to measure more spreads with one of two motivating factors: the tree has an impressive spread, or the tree may qualify as a state champion. In either case, I measure both quantities for comparisons sake. I'm also interested in seeing the maximum spread data used in ranking formula based of proportions of the greatest known dimensions. I prefer maximum spread to maximum lateral spread, a term which I find confusing. On the way back from the Forest Summit in October, Will Blozan and I discussed the obstacles to implementing a ranking system based of proportions of the greatest known dimensions. The lack of a reference list of maximum dimensions is a problem...  We've made progress on data  entry for the list and other related lists has started, but is proceeding slowly. Jess Riddle
 RE: Crown Spread Robert Leverett Jan 13, 2006 05:52 PST
 Ed, I read with interest the different points of view on crown spread measures. If we are trying to capture overall "bigness", the longest distance between two points in the crown would seem to have merit, though not as a substitute for maximum horizontal spread whether limited to one side of the tree or across the crown. I would think that trees that have huge crowns that stretch a long distance both horizontally and vertically deserve to be recognized in a way that takes both dimensions into consideration. It does complicate the measuring process. Bob
 Crown spread mania Robert Leverett Jan 13, 2006 09:14 PST
 Jess, Will, Ed, Ed, Darian, Scott, et al: ...  Another measure is maximum limb length defined as the linear distance from the center of the tree where the limb originates to the end point of the most distant point of the limb structure, i.e. some twig. We can extend this idea to be the maximum linear (as opposed to strictly horizontal) spread from one side of the crown to the other. This idea of course takes in the vertical aspect. The longest linear spread of the Sunderland sycamore is 154 feet as opposed to the 151.5 feet for the longest horizontal spread. As mentioned in a prior e-mail on the subject, getting accurate measurements for any of these concepts is the trick where visibility or accessibility raise their ugly heads.     A related concept is the longest linear distance one can travel while remaining inside the crown (more or less). This measurement is probably virtually impossible to determine accurately, but I can clearly see that the pin oak on the Mercy Hospital Campus has a longer linear inside crown spread (LICS) than it does for maximum horizontal spread across the crown. While I wouldn't want to attempt making this latter measurement as part of every crown measurement exercise, when fully documenting a huge tree for historical purposes, as well as others, it might help to set giant cherrybark oaks such as grow in Congaree apart from shorter broad-crowned trees. Any thoughts? Bob
 Re: Crown Spread Jess Riddle Jan 13, 2006 13:30 PST
 Ed, One of the principal reasons I prefer measuring maximum spread over measuring limb like is that the former is more a measure of the whole tree rather than just part of the tree. True, maximum spread does not include every branch, but the crown is a major functional unit of a tree and the maximum spread tells you something about that whole unit. Also maximum spread often is not as simple as long limb + trunk diameter + long limb. The widest part of the crown is frequently not centered on the trunk, and the path of the maximum spread does not coincide with any limbs. Jess
 Re: Crown Spread Edward Frank Jan 17, 2006 08:06 PST