A few corrections: GPS stands for global positioning system GPS signal is very weak outside. Inside a building, save when one is by a window, or sometimes near a skylight, where enough signals can get through, the GPS signal is nonexistent. GPS can locate you somewhere within a 10 to 30 feet circle, but not know exactly where in that circle you are actually located, only on a clear day with nothing blocking the line of sight to the satellites. In a city with tall buildings, in mountains, in canyons, in woods, and so forth, the accuracy will almost never be that good. This is because the computer triangulates one's location based on the time stamp of the signal and knowing which satellite is broadcasting the signal. The computer determines one's approximate location by the time differences between all the signals reaching the receiver. Oh, and at least four or five different signals are necessary in order to place one's location within a mile or so. On a very overcast day, whilst receiving 7 signals (there are apps that will display how many signals are being received), I had an accuracy of 7000 feet. Yes, the app kept placing me at locations in a few different towns in the area, and changed the location every 20 seconds or so.
David Chittenden, MSc, MRCAA Email: dchitten...@gmail.com Mobile: +64 21 2288 288 Sent from my iPhone > On 8 Nov 2013, at 11:28, "Alan Paganelli" <alanandsuza...@earthlink.net> > wrote: > > GPS can locate you with in a 30 foot circle with you at it's center. The > United States government controls that. They keep it that way for good > reasons which I won't go in to here. I'm just giving you an over view of how > GPS works so that you'll better understand. > > As was already pointed out, inside a building the GPS signals are very week. > The stores in a mall are very close together and even if you should by some > chance get a good clear signal, it still won't do you any good. > > Here's why. GPS or ground positioning system can only use latitude and > longitude signals. Where those two points meet is where your standing. That > raw data isn't going to do you much good in the real world. A sailor at sea > who knows how to shoot a star with a sexton and hasn't forgot totally how to > use one could figure out where he and his ship is. Today, they have > computers to do that for them and give a constant reading. > > Meanwhile back in the real world, a GPS system locates you using internal or > external maps. The data can be right or wrong and those of us who have been > using GPS for the blind for many years have come to know that there can be > gotchas in the data base your using. For example, the map data may say your > at point X when in reality, your nowhere anywhere near that place or point. > As they use to say in computer programming, garbage in, garbage out. In > other words, the GPS can only report to you what's in it's database. > > With week signals inside a mall and no database to refer to, your GPS is > useless even if it did get a good clean signal. There are other ways it can > be done but not with GPS alone. > ------- > > Regards, > > Alan > > Go Chicago Bears in 2013! > > Teenagers; Tired of being harassed by your stupid parents? Act now!!!!! > Move out. Get a job. Pay your bills wile you still know everything. > > Please click on: > http://www.home.earthlink.net/~alanandsuzanne/ > There, you'll find free files of my arrangements and performances played on > the Yamaha Tyros 1 keyboard. The albums in Technics format formerly on my > website are still available upon request. Thanks for listening! > ----- Original Message ----- > From: Sieghard Weitzel > To: viphone@googlegroups.com > Sent: Wednesday, November 06, 2013 11:00 PM > Subject: RE: Using the Seeing Eye App in a Mall > > Hi Sarah, > > I don’t think there is a single GPS app which will do this. The GPS signal is > very weak to begin with and while modern receivers are very good and often > might pick up the signal inside a building, the accuracy will suffer > especially given all the interference of concrete, steel etc. > > Another thing is that I doubt the stores in a mall are mapped. > > I think we’ll have to wait until malls map their buildings and put other > technologies like RFID or Bluetooth beacons in place and then provide apps > which can access this information before we get useful results inside malls > or other large buildings. Give it 10 years and we probably look back and > shake our heads in wonderment why this didn’t exist before. > > > Regards, > Sieghard > From: viphone@googlegroups.com [mailto:viphone@googlegroups.com] On Behalf Of > Sarah Clark > Sent: Wednesday, November 06, 2013 10:12 PM > To: viphone@googlegroups.com > Subject: Using the Seeing Eye App in a Mall > > I would like to use the Seeing Eye app to identify stores I am walking > past in a mall, but I can't figure out how to get this info. I was using it > inside a mall today, and it told me a couple of things, like that Starbucks > was nearby, but it was mostly telling me about streets and intersections near > the mall. What settings do I need to make sure the app is set to in order to > get it to identify the stores inside? Is it part of the location wand, or is > it a particular setting, or some combination of things? > > Thanks, > Sarah > > > -- > You received this message because you are subscribed to the "VIPhone" Google > Group. > > Post a new message to VIPhone by emailing viphone@googlegroups.com. > > Search and view the VIPhone archives by visiting > http://www.mail-archive.com/viphone@googlegroups.com/. > > Reach the VIPhone owner and moderators by emailing > viphone+ow...@googlegroups.com. > > Unsubscribe and leave VIPhone by emailing > viphone+unsubscr...@googlegroups.com. > > More VIPhone group options can be found by visiting > http://groups.google.com/group/viphone?hl=en. > --- > You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to viphone+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- > You received this message because you are subscribed to the "VIPhone" > Google Group. > > Post a new message to VIPhone by emailing viphone@googlegroups.com. > > Search and view the VIPhone archives by visiting > http://www.mail-archive.com/viphone@googlegroups.com/. > > Reach the VIPhone owner and moderators by emailing > viphone+ow...@googlegroups.com. > > Unsubscribe and leave VIPhone by emailing > viphone+unsubscr...@googlegroups.com. > > More VIPhone group options can be found by visiting > http://groups.google.com/group/viphone?hl=en. > --- > You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to viphone+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- > You received this message because you are subscribed to the "VIPhone" Google > Group. > > Post a new message to VIPhone by emailing viphone@googlegroups.com. > > Search and view the VIPhone archives by visiting > http://www.mail-archive.com/viphone@googlegroups.com/. > > Reach the VIPhone owner and moderators by emailing > viphone+ow...@googlegroups.com. > > Unsubscribe and leave VIPhone by emailing > viphone+unsubscr...@googlegroups.com. > > More VIPhone group options can be found by visiting > http://groups.google.com/group/viphone?hl=en. > --- > You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to viphone+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the "VIPhone" Google Group. Post a new message to VIPhone by emailing viphone@googlegroups.com. Search and view the VIPhone archives by visiting http://www.mail-archive.com/viphone@googlegroups.com/. Reach the VIPhone owner and moderators by emailing viphone+ow...@googlegroups.com. Unsubscribe and leave VIPhone by emailing viphone+unsubscr...@googlegroups.com. More VIPhone group options can be found by visiting http://groups.google.com/group/viphone?hl=en. --- You received this message because you are subscribed to the Google Groups "VIPhone" group. To unsubscribe from this group and stop receiving emails from it, send an email to viphone+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
