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 <j...@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: j...@datalude.com > Philippines: +63 2 403 1311 / mob: +63 917 849 3939 > Hong Kong: +852 6840 6693 > w: http://www.datalude.com/ _______________________________________________ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
