Michael Gilligan | 09/07/2022 10:39:29 |
![]() 23121 forum posts 1360 photos | I have a particular interest in this 4G cellphone tower https://earth.app.goo.gl/RhxwpW … I want a reasonable estimate of the height, above ground, of the antennae Physical access is limited, but I could do some trig from the pavement. Before going there with the Disto [or whatever] … I would welcome any clever suggestions from the forum. . ”Cheating” is permitted … so if you happen to have access to the design drawings, please just tell me the dimensions. I suspect that we could do a passable job by scaling from the ‘Street View’ images. Over to you, if anyone fancies a try. MichaelG. |
Nick Clarke 3 | 09/07/2022 10:48:58 |
![]() 1607 forum posts 69 photos | I would say the antennae height is approx 4 to 4.5b times the height of the blue vehicle or 5 times the eaves height of the building between the silo and the mast. Only a rough guess of course |
Emgee | 09/07/2022 11:00:51 |
2610 forum posts 312 photos | Check with the Local Planning authority, the application for planning permission will include the mast height. Emgee |
peak4 | 09/07/2022 11:22:41 |
![]() 2207 forum posts 210 photos | Using Google earth & streetview only, both of which might show height distortion, I'd say 12m to the top of the mast roughly. |
DiogenesII | 09/07/2022 11:27:46 |
859 forum posts 268 photos | Go there with a stick of known height, measure the shadow of the mast, and then measure the shadow of your stick... Or if it is in the same 'plane of distance' as the fence, say, measure the height on the picture with a ruler, then mark off that same distance horizontally along the fence and go out and measure that.. |
Journeyman | 09/07/2022 11:30:03 |
![]() 1257 forum posts 264 photos | It's about 8 fence posts high so about 8' x 8 64' in old money John |
peak4 | 09/07/2022 11:35:22 |
![]() 2207 forum posts 210 photos | Posted by DiogenesII on 09/07/2022 11:27:46:
Go there with a stick of known height, measure the shadow of the mast, and then measure the shadow of your stick... Or if it is in the same 'plane of distance' as the fence, say, measure the height on the picture with a ruler, then mark off that same distance horizontally along the fence and go out and measure that.. I haven't got time now, but using Google Maps Satellite imagery, you can measure distance. |
Michael Gilligan | 09/07/2022 12:57:49 |
![]() 23121 forum posts 1360 photos | Posted by Emgee on 09/07/2022 11:00:51:
Check with the Local Planning authority, the application for planning permission will include the mast height. Emgee . Thank you Why didn’t I think of doing that before asking here ? [ please resist the temptation to answer ] Sadly there are no drawings accessible, but the summary is near enough and I’ve learned some new jargon. MichaelG . |
Journeyman | 09/07/2022 13:22:46 |
![]() 1257 forum posts 264 photos | Apparently the fence posts are only 6' high... Unless of course it was the old ones at 14m and the new one is taller... That doesn't help much, sorry John Edited By Journeyman on 09/07/2022 13:34:15 |
JasonB | 09/07/2022 13:36:16 |
![]() 25215 forum posts 3105 photos 1 articles | Even to do it with trig you would need to be able to measure how far you are from the pole which if you can't access it won't work. Then the angle between the top and bottom of the pole from your view point would give you an answer |
Michael Gilligan | 09/07/2022 13:42:54 |
![]() 23121 forum posts 1360 photos | Posted by JasonB on 09/07/2022 13:36:16:
Even to do it with trig you would need to be able to measure how far you are from the pole which if you can't access it won't work. … . That’s why I mentioned the possibility of using the Disto [ a laser-based distance measurer made by Leica ] MichaelG.
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V8Eng | 09/07/2022 14:40:35 |
1826 forum posts 1 photos | Bit too far away for an iPad to measure I think. Don’t ya just love the effect modern technology is having on landscapes!!! Edited By V8Eng on 09/07/2022 14:40:48 Edited By V8Eng on 09/07/2022 14:42:30 |
duncan webster | 09/07/2022 15:33:59 |
5307 forum posts 83 photos | Posted by JasonB on 09/07/2022 13:36:16:
Even to do it with trig you would need to be able to measure how far you are from the pole which if you can't access it won't work. Then the angle between the top and bottom of the pole from your view point would give you an answer You can establish 2 points outside the fence a known distance apart then use trig on horizontal bearings to work out how far one point is from the mast. Then vertical bearing from that to get the height. Looking up the planning application is too easy |
duncan webster | 09/07/2022 15:34:43 |
5307 forum posts 83 photos | Posted by JasonB on 09/07/2022 13:36:16:
Even to do it with trig you would need to be able to measure how far you are from the pole which if you can't access it won't work. Then the angle between the top and bottom of the pole from your view point would give you an answer You can establish 2 points outside the fence a known distance apart then use trig on horizontal bearings to work out how far one point is from the mast. Then vertical bearing from that to get the height. Looking up the planning application is too easy |
Michael Gilligan | 09/07/2022 16:45:55 |
![]() 23121 forum posts 1360 photos | Posted by V8Eng on 09/07/2022 14:40:35:
Bit too far away for an iPad to measure I think. Don’t ya just love the effect modern technology is having on landscapes!!! . Not quite sure I get your point, V8 This is a screen-grab from the zoomed-in ‘Street View’ [ click the image for a bigger version ] . . Once calibrated, you could probably build a credible scale model from that. MichaelG. Edited By Michael Gilligan on 09/07/2022 16:48:35 |
SillyOldDuffer | 09/07/2022 17:13:08 |
10668 forum posts 2415 photos | Just home from a family jolly, without reading any of the answers, I used the fence posts (2.4m), as per Journeyman, and got a low estimate of 13m and a high estimate of 16m. The average is 14.5m, pleasingly close to the planning application. If the length of a tall object's shadow can be measured, the height is directly proportional to the length of a shadow thrown by a pole of known length at the same time. Provided the shadows are clear, the method is accurate and doesn't need trigonometry or measuring angles. A traditional Abney Level or Theodolite both work in poor weather but involve sums. If the object is a known distance from the observer positioned with a large-scale ordinance map, the stadia calculation could be rearranged to give a reasonable answer. Significantly better by laying out an accurate baseline with a surveyors chain, measuring the angle to the top, and doing the trig. The baseline must either be levelled or have the slope compensated for in the maths. 'Last of the Summer Wine' methods: Michael and I will fly a quadcopter fitted with GPS around the tower, fall in a cow-pat, and be chased through nettles by dogs and an angry farmer. Or we will climb the tower with a plumb line, only to discover it's not quite long enough. Then we'll go viral on the web after being filmed wetting ourselves due to having to wait beyond bladder endurance for an air-sea rescue helicopter. Michael will get the measurements right and I will cock-up the maths. Dave
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V8Eng | 09/07/2022 17:31:51 |
1826 forum posts 1 photos | Posted by Michael Gilligan on 09/07/2022 16:45:55:
Posted by V8Eng on 09/07/2022 14:40:35:
Bit too far away for an iPad to measure I think. Don’t ya just love the effect modern technology is having on landscapes!!! . Not quite sure I get your point, V8 This is a screen-grab from the zoomed-in ‘Street View’ [ click the image for a bigger version ] . . Once calibrated, you could probably build a credible scale model from that. MichaelG. Edited By Michael Gilligan on 09/07/2022 16:48:35 Michael. I was thinking in terms of the iPad measure feature which I tried on our big trees (20m+) without success. That was a rather tongue in cheek experiment anyway. |
Peter Greene | 09/07/2022 17:48:28 |
865 forum posts 12 photos | There appears to be a bloke standing beside it. If he's there next time you go, you could call him over and ask him how tall he is. |
Michael Gilligan | 09/07/2022 19:25:54 |
![]() 23121 forum posts 1360 photos | Posted by V8Eng on 09/07/2022 17:31:51: . Michael. I was thinking in terms of the iPad measure feature which I tried on our big trees (20m+) without success. That was a rather tongue in cheek experiment anyway. . Ah … I don’t think I’ve ever used it There are plenty of other Apps that do measuring The one that I particularly like for measuring photos is : https://apps.apple.com/gb/app/ep-calipers/id982313078 Not an intuitively obvious choice, as it’s targeted at a niche market … But, if you put a little effort in, it works very well indeed. MichaelG. |
Jon Gibbs | 09/07/2022 20:32:54 |
750 forum posts | Blimey this is a blast from the past - as a Scout we used to use similar triangles to estimate the height of trees. If you position a vertical pole 11 horizontal units from the base of the mast and sight from the ground a further unit away from the pole, the intersection of the top of the mast on the pole allows an inch to feet conversion - one inch on the pole = one foot on the mast. Edited By Jon Gibbs on 09/07/2022 20:35:55 |
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