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Author: Subject: Any surveyors in the house? GPS measurements
tegwin

posted on 21/2/17 at 04:55 PM Reply With Quote
Any surveyors in the house? GPS measurements

I need to lay out a set of 10 points on the ground and measure their location as accurately as possible using GPS for an aerial survey.

I am aware that survey grade equipment can be expensive and complex... but does anyone know much about surveying?

What is the simplest way to do this? At this stage I would like +-50cm but appreciate that with accuracy comes cost....





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theduck

posted on 21/2/17 at 06:05 PM Reply With Quote




[Edited on 21/2/17 by theduck]

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02GF74

posted on 21/2/17 at 06:30 PM Reply With Quote
My understanding is gps cannot give better than 5 m resolution,.






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tegwin

posted on 21/2/17 at 07:05 PM Reply With Quote
Whilst its true that a single GPS unit can't be that accurate there are ways and technologies to get it down to 1-2cm.

What I lack is the hardware and the knowledge to use said hardware so was after some advice.

[Edited on 21/2/17 by tegwin]





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rgrs

posted on 21/2/17 at 07:24 PM Reply With Quote
Leica Gs25 accuracy is currently 3mm !

Might be worth speaking to https://www.sccssurvey.co.uk/

They should be able to point you in the right direction.

Roger

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02GF74

posted on 21/2/17 at 07:32 PM Reply With Quote
Wow thats amazibg.... so ignore my comment, guerss you learn something everyday.






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coyoteboy

posted on 21/2/17 at 07:42 PM Reply With Quote
Normal single point GPS works to 5m. Sub-5m requires multiple base-stations and differential measurement from them.






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slingshot2000

posted on 21/2/17 at 07:43 PM Reply With Quote
I am sure the people that own the GPS brag about it being more accurate than 5M, wouldn't want the US military chucking a Tomahawk through the wrong Jihadi's window, would we ?
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coyoteboy

posted on 21/2/17 at 07:50 PM Reply With Quote
They're not GPS driven when in close range of the target IIRC, they're generally laser designated if they need more accuracy. 5m is less than the length of a normal estate car.

Some nice info here:
https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/gps-beginners-guide.html


[Edited on 21/2/17 by coyoteboy]






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