Sealevel in uniMAps possible?

[erich.wanker]

hi ..

to calculate the lenght of a line - i should calculate allso with the altitude .. see as example: https://www.mapcoordinates.net/en

is the altitude-value in future possible?

At this time i become Lat and Lng Values 

procedure UniMap1MapClick(Sender: TObject; const Lat, Lng: Double; const Zoom, X, Y, Id: Integer);

 

ThanX

Erich

[Hayri ASLAN]

You can't get altitude onClick event. We are using Leaflet.js.

Leaflet is a map display library, not a data API, not an elevation raster query library.

For this, you will have to rely on some kind of elevation dataset.

Whether to use a service like that or whether you should have your own elevation dataset is up to you. In any case, Leaflet does not provide a favorite elevation query service by default (contrary to what Google Maps does, as it relies on Google's elevation datasets).

[erich.wanker]

ThanX for the perfect information :-)

 

i just found  the Google elevation dataset api thing

and try to play with the google JSON - if i send Longitude and Latitude 

https://developers.google.com/maps/documentation/elevation/intro

 

function Tf_show_myMap.SendAnfrage(linkadresse:string):string;
const
  cUSER_AGENT = 'Mozilla/4.0 (MSIE 6.0; Windows NT 5.1)';
var
 httpResponse: string;
 Stream: TStringStream;
 URL, telParams:string;
 HTTP:TidHTTP;
begin
  URL:=linkadresse;
  Stream := TStringStream.Create;
  HTTP:=TIdHTTP.Create(nil);
  HTTP.ReadTimeout := 10000;{ IdTimeoutInfinite; }
  HTTP.ConnectTimeout := 10000;
  try
    HTTP.Request.UserAgent := cUSER_AGENT;
    try
      HTTP.Get(URL, Stream);
      result:= Stream.DataString;
    except
      result:= 'Communication Error!';
    end;
  finally
    Stream.Free;
    HTTP.Free;
  end;
end;

 

procedure Tf_show_myMap.UniButton20Click(Sender: TObject);
begin
showmessage(SendAnfrage('http://maps.googleapis.com/maps/api/elevation/json?locations=39.7391536,-104.9847034  [and your API key] '));

end;