After completing the tree measuring exercise for the Forestry Commission Felling Licence I thought it would be sensible to double check some of the tree hright measurements. I took the Nikon Forestry Pro 2 to the orchard with a spreadsheet printout of the Ash trees. Most of the leaves have now fallen so I can more easily see the tops of the trees from the limited confines of the orchard.
The Forestry Pro 2 works by measuring the time it takes for a brief pulse of near-infrared laser light to bounce back from the target object. In that respect, it is a bit like a radar.It can measure distance with an accurance of a cm or two over a distance of 100 metres, its full range is about 1500 metres depending on conditions. There is also an in-built clinometer which measures the angle you are tilting the device at the time the reading is taken.By performing trigonometry on the readings the device can calculate:
- Distance of object
- Angle of the object, from horizontal
- The horizontal distance
- The height of the top of the object.
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