<br>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.<br>
<br><br><div class="gmail_quote">On Fri, Aug 12, 2011 at 4:54 PM, Jim Morgan <span dir="ltr"><<a href="mailto:jim@datalude.com">jim@datalude.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
maning sambale wrote, On Friday, 12 August, 2011 04:12 PM:<br>
<div class="im">> My handheld GPS is off by 6.92 meters from the published PRS92 coordinates.<br>
<br>
</div>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.<br>
<a href="http://dl.dropbox.com/u/274900/DSC00341.JPG" target="_blank">http://dl.dropbox.com/u/274900/DSC00341.JPG</a><br>
<br>
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.<br>
<br>
Also ... maybe roadworks departments have records of these that they'd be prepared to release?<br>
<br>
Jim<br>
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