I learnt from a GPS (receiver) maker that latest systems are accurate to about five metres, but the ones I'm talking about are probably applied for enterprise activities. GPS technology uses the process called tri-angulation to locate and object on the ground.
Subramani -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Adhimoolam Vetrivel Murugan Sent: Tuesday, March 23, 2010 9:29 PM To: jean parker; [email protected] Subject: Re: [AI] downloading a map There will always be error in using GPS navigational systems since it determines the location based on wide variety of factors. For that matter, even WF is not accurate either. However you can reach a given location within the range of 100-150 Meeters and that's the greatest improvements in terms of navigational technology. Paid GPS products like WF etc update their maps constently and henceforth they are more accurate then open source maps like Google. However, Google maps and other similar systems are constently improving and Loadstone henceforth uses Google maps as the source. Moreover, GPS locations are obtained from 24 satelites that are located outside India and henceforth obtaining maps in that context is nothing to do with local governments. Vetri. On 23/03/2010, jean parker <[email protected]> wrote: > Rajesh: > > I don't know if google or nokia maps has this information but my experience > is that it is difficult to obtain accurate maps of anything in India whether > on paper or not. I understand that some of these maps were produced by the > military and are therefore considered as prized possessions by those who > have them. The one time when I needed such a map of a rural area, I had to > get it from an NGO who had somehow gotten it from the government. Of course > it was way out of date but even so I was not allowed to keep it for any > period of time which meant I had to have the sighted person who ultimately > required the information in the right place and at the right time. > > I hope things have changed as this was some time back. > > Jean > > > > > > To unsubscribe send a message to [email protected] with > the subject unsubscribe. > > To change your subscription to digest mode or make any other changes, please > visit the list home page at > http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.i n > To unsubscribe send a message to [email protected] with the subject unsubscribe. To change your subscription to digest mode or make any other changes, please visit the list home page at http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.i n Email secured by TPML Electronics To unsubscribe send a message to [email protected] with the subject unsubscribe. To change your subscription to digest mode or make any other changes, please visit the list home page at http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in
