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Old 11-27-2012, 02:04 AM   #1
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Altitude finder

Is there such a thing as a hand held laser pointer that gauges altitude? i.e. if I pointed the laser from the ground to the top of a wall/tree/object in the sky, is there something that would tell me how high it is? do boi nam quan ao nam dep mu so sinh vay lien cong so vay lien cong so chup anh ky niem
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Old 11-27-2012, 02:33 AM   #2
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Not my field, but I know laser range-finders and distance measurers exist. They would be straight line, so altitude can be figured if you know the angles. I have no idea what their distance limitations might be.
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Old 11-27-2012, 03:02 AM   #3
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Laser range finders can measure any distance, but each model will have its own limitations.

As lbender said, if you know the distance and the angle accurately you can tell the height. Keep in mind that as the distance gets greater the curvature of the Earth will come into play making the math much tougher.
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Old 11-27-2012, 03:06 AM   #4
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http://www.rfs.org.uk/learning/measuring-trees

Yeah, you can use a number of devices.

http://en.wikipedia.org/wiki/Hypsometer
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Old 11-27-2012, 04:35 AM   #5
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But nothing that does it automatically? i.e. point at a building and it tells you the height in relation to sea level. I thought maybe there was some GPS laser gadget that might do it. do boi cao cap quan ao nam chan goi so sinh cho be vay cong so nu vay cong so nu chup anh da ngoai dep nhat
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Old 11-27-2012, 05:33 AM   #6
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Originally Posted by profen4 View Post
But nothing that does it automatically? i.e. point at a building and it tells you the height in relation to sea level. I thought maybe there was some GPS laser gadget that might do it.
I don't know if such a device exists, but you'd need to know several things:

1. elevation of base of building, relative to sea level. Once that is established, it becomes a Pythagorean trigonometric problem.

2. horizontal distance from building. One leg of the right triangle you need to calculate

3. angle of sight, = angle of hypotenuse of right triangle.

From the latter two measurements, you can calculate the third leg of the triangle, which would equal the height of the building. Add that to the basal elevation above sea level, and you have your answer.

For best accuracy, you also need to take into account your own height, presuming this is some form of hand-held sighting instrument. And I'm also assuming your position is at a horizontal level with the base of the building, which might not be true.

But I was a Boy Scout once, and we did an exercise like this, in a cruder way, to figure out the height of trees. With a little ingenuity, you can actually get pretty good results, and fairly quickly, even without an electronic device.

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Old 11-27-2012, 09:18 AM   #7
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If it's a fiction you can make it up and have it sound plausible. Just say the device gets a distance using a laser, gets an angle reading from the device and makes a calculation using data plus elevation data from a GPS.
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Old 11-27-2012, 07:21 PM   #8
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Here you go:
http://www.fltgeosystems.com/disto/l...-d5-lca764553/
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Old 11-27-2012, 07:36 PM   #9
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Most GPS devices will indicate altitude above sea level FOR THAT DEVICE. It's not a stretch to combine the above mentioned devices with the GPS that will render an gross altitude for the top of the building/object.
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Old 11-28-2012, 11:32 PM   #10
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Originally Posted by profen4 View Post
I thought maybe there was some GPS laser gadget that might do it.
There are. We don't use them hand-held but on a monopod or tripod for accuracy. And they don't come cheap. But surveyors use these all the time.

Trimble is a major manufacturer of this type of equipment: http://www.trimble.com/

Jeff
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Old 11-29-2012, 12:26 AM   #11
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There are also ultrasonic range finders.
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