Meter calibration: Thirty-five (35) objects (including buildings, pillars, doors, windows, gates, home refrigerators, picture frames fixed on walls, poles, bus-stop tops, and under constructions structures) of know height were used to calibrate Hega Altimeter and Suunto Clinometer
needs to be held at your eye, at a 45[degrees] angle to the top of the tree.
What needs to be appreciated is the nature of some of the cave passages and the difficulty in taking readings from a compass and clinometer
in a freezing passage as small as 25cm high, wearing woollen clothing.
Height and diameter at breast height (DBH) of the nest tree were measured with a clinometer
and DBH tape, respectively.
The height of maximum crown scorch following the 2014 fire was measured using a clinometer
and trigonometry (www.
The relascope provides a rough estimation because the upper limbs rarely grow vertically; consequently the accuracy of the clinometer
function of the instrument is limited.
In 2009, using my Nikon Prostaff 440 and a Suunto clinometer
, I settled on between 141 and 142 feet for this tree growing at two miles above sea level.
Prior to 2010, height measurements were undertaken with a Bushnell Yardage pro rangefinder combined with a Suunto clinometer
and, from 2010 onwards, a Nikon Forestry 550 rangefinder with in-built hypsometer.
Other remote party equipment included a mounting tripod, a petrol generator for battery charging, a spare 12 volt battery, a high frequency radio transceiver, clinometer
, prismatic compass, plumb-bobs, box measuring-tape, field books, survey station summaries, measuring scheme diagram, protractor, and ruler, as well as a mechanism barometer and a psychrometer.
A digital magnetic compass provides a [+ or -] 8 mill accuracy, the electronic clinometer
having a [+ or -] 4 mill accuracy, position being provided by an embedded GPS/SAASM.
Slope orientation and gradient were determined for each releve using a compass and clinometer
, and location and elevation, with a hand-held global positioning system device.
Tree heights were measured with an electronic clinometer
and stem diameters were measured at 1.