GPS Differential Beacon Signal (DGPS) receivers deliver positions accurate to within 10 meters, and potentially to 1 meter. these rebroacast in a building gives fairly accurate measurements.
David Legg sent the following on 1/8/2012 10:42 AM: > When I do surveys for OpenStreetmap.org I take my GPS unit outside and > traverse the street/path/road etc in both directions to get a good > average set of nodes. On a good day here in the UK I can get the > accuracy down to a few feet using a Garmin eTrex Vista HCx. But that's > only after letting the unit track all available satellites for a minute > or two. > > Getting sufficient signal inside a multi-story building is pretty > difficult. > > I've started testing a Samsung Galaxy Tablet and using Google maps to > show where you are causes your position to jump about as the unit flips > between the different methods of locating your position. > > > On 08/01/12 17:57, BJ Freeman wrote: >> how do you explain surveying with gps? >> >> David Legg sent the following on 1/8/2012 9:21 AM: >>> Nice idea but I don't think this would work very well unless you were >>> eating alfresco! >>> >>> GPS signals don't penetrate buildings very well and triangulation using >>> cell tower signals would mean you would have to place each table several >>> hundred yards apart! >>> >>> David Legg >>> >>> On 08/01/12 16:34, BJ Freeman wrote: >>>> using 10.2 tablets, customer can order and pay for meals. >>>> with the GPS built in position in the restaurant can be determine and >>>> translated to table an place at the table. >>>> the staff have to be trained to put the tables in preconfigured places >>>> and ways. >>>> the payment allows for spiting the bill and manually Entering the CC >>>> info for each that is paying or use the attached card swipe. >>>> >>>> >>> >> > >
