Rounding on plans. Why?

conrad · 2016-10-07T13:32:00Z

Our Registrar General's directions no longer include the requirement for rounding dimensions on our plans that are lodged for registration to 10's of mm or 10's or 20's of arc seconds. Our dimensions are required to be correct to 3 decimal places, and bearings should be shown as measured. Intuitively there seems to be no reason why rounding my plans would give the next user an advantage of any kind, so I don't do it. When retracing my own fieldwork I'm finding that agreement is closer to the mm level rather than the cm level, so I figure showing 3 decimal places in my distances is a reasonable thing to do. For azimuths, the nearest second seems over-adequate for azimuths, but closer in truth than 10" or 20" favoured by others in my area. I can't think of a reason why I'd take the additional step of adding or subtracting totally random amounts to the calculated dimensions between my monuments. Hopefully people using my plans will appreciate that the parcels and connections close nicely, without adjustment in their CAD. That's how I see it anyway.The people I've asked about rounding their measurements seem to see it as some kind of indirect statement about the achievable accuracy by a cadastral surveyor. I'd think this could be better conveyed by a direct statement of accuracy on the plan face, if the recording authority permitted it. Just tell people directly what to expect. That is if the surveyor actually know what to expect from their work. Also, seemingly, nobody wants to be known in their area as "mm Mick". I've heard this used as a term of derision a few times.This topic would rank pretty low (near last?) on the importance scale as far as cadastral surveying and plan-making goes, but it's just something that has piqued my interest. Perhaps because it seems to me like it's mostly an acquired, ideological position, rather than a practice that results in a demonstrable benefit. As I said, I just turned the rounding off. You have my measurements and calculations, unaltered, and best I could make them. So, why do you do it, or not? What is your ideology on this issue of little importance? Have you declared a jihad on the mm?

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Strictly Surveying

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conrad

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BajaOR, post: 394482, member: 9139 wrote: What are your issues with LandXML? I rarely deal with it, but my sense is that it is a good format / standard.

Sorry, I wasn't being specific enough. I didn't really mean the standard itself, rather the NSW LPI attempting to use it to render plan images, and make it look like a human did it. It isn't going so well.

Posted : October 9, 2016 2:02 am

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Rounding on plans. Why?

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