Hi I'm after a method of measuring outside up to 60mtrs + the object in the distance is not huge, say a mtr across and may not be square on to me do these Laser Distance measurement tools handle this, (I appreciate the cheaper ultrasonic will be of no use) Anyone got any experience of these gadgets? thanks
You get a stick with a reflector thingy on it and measure to the reflector thingy rather than the object.
If it's across level ground, use a trundle wheel. Ones for schoolchildren's use are cheap. Depends on the accuracy required.
Owain
what is wrong with a tape?
what is wrong with a tape?
OK, its usually across a valley and there may be water between me and the target area and of course I need the line of sight distance not the tape measurement lying on the ground so, without a reflector, will it work as is ? ta
Some of the better Leica Disto jobbies will do it with ease. The posh ones even have a colour screen which lets you zoom in on your target to pinpoint where you are measuring to.
Vass explained on 13/11/2012 :
Using a sighting compass, take a bearing on the object, mark on the ground where you take that sighting. Now move from that point to another point, adjusting your position until your bearing is + or - 45 degrees of your first sighting and place a second marker. Distance between the two markers is same as the distance from the object - give or take.
Google Maps??????????????
Baz
I use a Bosch one. I'll check what the spec is later but, IIRC, it goes up = to about 50 metres, so not as powerful as the one you'd need.
What will you be aiming at, and what light conditions are you expecting? Th= ose are the two biggest factors (besides the distance) in deciding whether = it'll work for you.=20
Mine works superbly over short distances, pointed at light-coloured targets= or in the dark. It becomes increasingly tricky as those factors get less i= deal. The longest distances I've measured with mine are about 30 metres, wh= ich works perfectly on a cloudy day with brick walls, fence panels etc. as = targets, even at odd angles.
For longer distances, and with cluttered target areas, it becomes increasin= gly difficult to see the laser spot. You can normally find it by carefully = sighting along the side of the case. For 60 metres, you might have to resor= t to a tripod or some other way of keeping it steady. I guess a longer-rang= e unit will help by having a correspondingly brighter spot.=20
If you can make the measurement in the dark or in half-light, it becomes en= ormously easier and you can measure to much less ideal targets.
I have to say, I think they're superb gadgets for general surveying-type us= es - much less hassle than a tape, most jobs become one-man and it's more a= ccurate too.
Cheers,
Colin.
100m tape measure. Check Google.
JGH
Or a piece of string and a 10M Tape.
Baz
Rubbish.
MBQ
Half there. You also need to sight back to the orginal point at + or - 90 deg to the orginal bearing. Then the distance between the orginal and second point is more or less the distance to the point being sighted.
Yep, got my eye on a Bosch too
Archery Targets
Wooded shade
Perfect, thanks Colin
Man at B&Q formulated the question :
Says the Man who could not offer any method, nor could explain his rubbish comment!
Dave Liquorice formulated the question :
Deer stalking?
Tie a string to the arrow.
Video the arrow, calculate its velocity between two known points, and extrapolate into distance for the time of flight.
I can't think of any method involving a barometer yet.
Golf rangefinder.
both no good, rely on known height of target (Gold flag pole) Field Archery targets are mixed sizes or even 3D
In message , Harry Bloomfield writes
60 degrees, surely (equilateral triangle) - or have I misunderstood the explanation?However, the problem is the essentially same as measuring the height of a tree. The ground needs to be level.
At a certain distance D1 from the tree, measure the angle A1 to the top (a theodolite is the 'correct' instrument). Then walk a measured distance D2 closer or further away from the tree, and repeat the angle measurement (A2). You can then draw to scale what you have done, and measure D1 + D2, or calculate it using trigonometry (simultaneous equation involving tanA1, tanA2, D1 and D1 + D2).
It obviously can be triangulated, but not like that, I agree. :)
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