Found a better solution here: http://www.movable-type.co.uk/scripts/latlong.html
It's javascript code to calculate the distance between two lat-long coordinates! On Feb 2, 1:17 pm, James <[email protected]> wrote: > Thank you very much, Larry! Looks like a winner! :) > > On Feb 2, 12:46 pm, "[email protected]" <[email protected]> > wrote: > > > > > > > > > On Feb 2, 7:05 am, James <[email protected]> wrote: > > > > Thank you for your response, Rossko! > > > > As you stated, GPS accuracy is something important to take into > > > account. For the purpose that I intend, accuracy within the 20-100m > > > range would be acceptable. My confusion is what the best approach is > > > for determining when a user has gotten within this 20-100m range of > > > the destination? I will have their geolocation and the destination > > > location, but what values should I compare to determine if they are > > > within this 20-100m area? > > > calculate the distance between them and compare it to a threshold. > > See the geometry > > library:http://code.google.com/apis/maps/documentation/javascript/geometry.html > > > -- Larry > > > > On Feb 1, 8:07 pm, Rossko <[email protected]> wrote: > > > > > That's entirely up to you. > > > > Factors to take into account: > > > > GPS are not accurate to nanometres. > > > > Roads, etc, are physical objects with dimensions. If your user is 20m > > > > away he may be on the other side of the road to your target - is that > > > > good enough for you? We can't decide for you. > > > > Buildings, plots, are physical objects etc. If a building has a 100m > > > > frontage when does your user arrive at it? If they are walking (you > > > > didn't say) that might be more important. > > > > Directions results take you to nearest point that they know of, to the > > > > point they think you are trying to get to. You might specify an > > > > address (you didn't say) which geocodes e.g. to a rooftop. Directions > > > > can never quite get to that from the public street. > > > > Or, if geocoding is poor in the area or country you are operating in > > > > (you didn't say), Directiions may only take you to the end of the > > > > street and not a specific address. > > > > > I'd think I'd start experimenting with proximity in the 20 to 100m > > > > range and see how it goes.- Hide quoted text - > > > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
