Geolocation

VCL TMS VCL WebGMaps
1

Hello,

1. Is it possible to get geolocation from ZIP code only?
2. How to calculate a distance between 2 markers?

Thanks

2
  1. A ZIP code alone is not sufficient, you'd need the country too.
    2) Such distance calculation is currently not built-in but being considered for a future update
3

Hi,

I don't know if this will help you, but if you have the longitude and lattitude of the 2 points I believe one function for calculating distance is:
 
function Distance(lon1,lat1,lon2,lat2:  Single): single;
var
  dlat,
  dlon:  single;    
  a,c,d: single;
begin
  lat1:=degtorad(lat1);
  lon1:=degtorad(lon1);
  lat2:=degtorad(lat2);
  lon2:=degtorad(lon2);
  result:=ARCCOS(SIN(lat1)*SIN(lat2)+COS(lat1)*COS(lat2)*COS(lon2-lon1))*3956.545;
end;
4

By the way, this function is pretty accurate within a city or between cities in a state.  But, it does not take into account things like the bulge due to the rotation of the Earth, etc.  So, it is not as accurate between say LA and Paris