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| dear friends
what is the true method to measure the plant height?! is it from the soil surface to the highest point of the plant? or to the crown region only? and on which height i can measure the plant diameter? |
Follow-Up Postings:
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| Tree height is measured from the base of the tree (soil level) to the top of the tree (highest point). The diameter is typically measured at what is called DBH...diameter at breast height, or about 4.5 feet from the ground. Remember, the diameter is the inches across and not around (which would be the circumference). |
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| The height is measured in metres from the highest gound point adjacent to the trunk, to the top of the tree. Diameter is measured in centimetres, the measurement taken between 1.3-1.5m above ground. Resin |
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- Posted by ken_adrian z5 (My Page) on Fri, Jan 27, 12 at 9:00
| a good way to guesstimate it all ... is to put a measured stick .. a scale ... e.g. a yard stick or shovel against the trunk .... step back until the whole is in the camera lens .... and snap a pick .. then run to the computer and upload it ... and then use the scale to multiply out the result for example... on the pic below .... if i were to tell you the shovel handle is 5 feet.. and the spade adds one foot ... i can then look at my monitor.. using an index card.. and say the tree is 11 to 12 units tall .... multiply by 6 .. and say.. with a bit of certainty.. the tree is 66 to 72 feet tall ... resin has a much more complicated method that require geometry .. and measuring the sides of triangles .. and a small pagan dance ... which i would presume is better ... and i doubt my method is the TRUE method you request.. but.. in my world.. CLOSE ENOUGH ... any one else have a method.. besides dead reckoning???? ken |
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| I basically use Ken's method. I have a stake cut to 6' that I place against the trunk. Then I place the picture into software, and measure the length of the stake in the software, then scale the picture up to where the stake measures 6'. Then I measure the tree in the picture. This method will get you reasonable close. Camera angles a few other things can skew it some, but your not going to miss the dimensions by 3-4' on a 25-30' tree. Arktrees |
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| Gentle reminder: the original poster is in Egypt, so probably won't have a clue that 'feet' can mean anything other than the two objects at the ends of his legs ;-) Resin |
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| Use a Clinometer. Get 100 feet away from tree. Look at the bottom, take reading. Look at the top of tree, take the other reading. Add the two readings. It isn't quite that simple though. There are variables like, making sure to find highest point and measure out from that point. If a tree is leaning you may need to do some other math techniques. Diameter is taken 4.6 inches from the very bottom of the tree, or at the smallest point below 4.6 inches. J |
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- Posted by ken_adrian z5 (My Page) on Fri, Jan 27, 12 at 12:54
| but resin.. he can use his feet.. or anyone elses feet as a scale.. if he so chooses.. or meter sticks.. or whatever.. a scale is a scale.. presuming you can measure it in whatever units you wish .. and whats this gentle reminder stuff ... he finds us .. he writes us in english.. but he/she cant understand what we write .. whats that all about ... you are a metric snob who simply wants to inflict it on the rest of us.. whats that all about??? ... lol OP forgive me.. i failed to note your location.. and failed to WELCOME you to GW ... and do understand.. we are joking around with each other ... ken |
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| "Diameter is taken 4.6 inches from the very bottom of the tree..." What on Earth are you talking about???????? Here are links to a few sites that give helpful info. Each one has something to add for a more complete understanding. somewhat overly complex but informative text on How to Measure a Big Tree from the US Forest Service |
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| "circumference is measured at 4 feet 6 inches from the ground". This is the time-honored, established height to measure circumference of mature trees, those of us who do such measuring immediately recognized taxo-man's post. - dareknoor might specify whether he is measuring mature trees OR trees in production for the commercial trade. |
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| "...those of us who do such measuring immediately recognized taxo-man's post." Not me. I've never considered 4.6 inches to equal 4.5 feet! |
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| Thanks to all, rhizo_1 ----- ----- ken_adrian your innovative method to measure the height of the big trees was very useful, but my question was about the measurements of trees either big or small. ----- Don't worry pineresin, i know that one feet = about 30 cm. ----- Thanks again sam_md for your useful links ----- I think that, this forum will be very useful for me and i will earn a new friends |
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- Posted by tsugajunkie z5 SE WI (My Page) on Fri, Jan 27, 12 at 18:52
| Yes, nursery stock is different. Measuring the diameter of a 6-8 foot tree at 4.5 feet would not be of use. Since nursery stock is often sold based on its caliper then, yes, its measured at those heights you mentioned. We (myself included) were assuming you meant mature trees. tj |
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| Folks: The Native Tree Society (formerly called "The Eastern Native Tree Society" (ENTS) has developed guidelines/methods for tree measurement. I believe the basic "sine top, sine base" method, using a lazer rangefinder and a clinometer, is far more accurate than methods in more common use. The link below is to their index page, and the second category from the top deals with tree measurement. One topic is for discussions of all aspects of tree measurement, the second is for the basic measurement methods/guidelines that NTS has developed. There is a great deal of material here for anyone interested in tree measurement. The site also includes an extensive database of measurements of trees, both by species, and by individual states and sites. NTS is eager to recruit more competent tree measurers to help contribute to this database. The equipment is affordable, and there is in this website, extensive discussions of various kinds/brands of equipment. The basic "sine top, sine base" method is not difficult to learn. --spruce
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Here is a link that might be useful: Natiuve Tree Society Index page
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- Posted by strobiculate none (My Page) on Mon, Jan 30, 12 at 16:10
| resin has a much more complicated method that require geometry .. and measuring the sides of triangles .. and a small pagan dance ... which i would presume is better ... I want to hear more about this pagan dance. Is alcohol involved? Is traditional dress required? Is it legal in certain Arab countries and southern US states? And are there videos on youtube? |
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| The method of height measurement with the shovel or other known size object is a good idea. Seems like the quickest easiest way. |
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