For example I know that 21 of my strides equal 20m. You can of course carry a long tape measure with you when you think you’ll need one but I find it very helpful to know my pacing with reasonable accuracy. You will need to be able measure the distance that you are standing away from a tree. On a shelf that you’ve checked to be perfectly level with a real spirit level, place your smartphone on its side, then ‘zero’ it (calibrate it to read ‘0’).
If you’ve installed a good spirit level app it should allow you to calibrate your smartphone to reasonable accuracy. The full version costs under $2 and I’ve found that it works very well. Some of these include a tilt meter or level meter and it’s this kind that you will need to be able to measure an angle of elevation.įor the example below I use an iPhone and the Carpenter app from iHandy. There are a number of apps available that use the smartphone’s accelerometer to provide a virtual spirit level. IPhone and Google Android phones (sorry, I have no working knowledge of Blackberrys) allow apps to be downloaded. This is a method I’ve developed that I hope others will find useful. However, don’t despair as it is quite possible to achieve good results with a smartphone with the advantage that you nearly always have one with you. These can be quite expensive to buy so you’re not likely to invest in one unless you need to measure trees frequently. Foresters use a clinometer to calculate the tree height.
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