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

[Ed Garcia]

Manila Water Co actually mark their water meters by GPS.  And they do use
those sub-centimeter accurate GPS equipment.  I saw them mark our water
meter a few months ago.  They say they also do this to mark where their
supply pipes are.


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
>
>
>
> --
>
>   datalude: information security
>   e: jim at datalude.com
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>
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