[talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM

Eugene Alvin Villar seav80 at gmail.com
Sat Aug 13 02:53:30 BST 2011


100ths of a second would then mean an accuracy of about 28 centimeters
or less than a foot. The manhole cover is certainly larger than a foot
so it's extremely accurate indeed.


On Fri, Aug 12, 2011 at 4:54 PM, Jim Morgan <jim at datalude.com> wrote:
> maning sambale wrote, On Friday, 12 August, 2011 04:12 PM:
>> My handheld GPS is off by 6.92 meters from the published PRS92 coordinates.
>
> That reminded me, I was walking down the street the other day in Makati, and I came across a manhole cover. It had a detailed GPS co-ordinate engraved on it.
>        http://dl.dropbox.com/u/274900/DSC00341.JPG
>
> The co-ordinates were accurate down to 1/100th of a second, which seems quite precise (one second is around 28 metres at this latitude). I was wondering if this is common to all areas / cities, and if so, can we use it for something - aligning or verifying roads.
>
> Also ... maybe roadworks departments have records of these that they'd be prepared to release?
>
> Jim
>
>
>
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