Umwandlung geograf. Koord. DD.DDDDD -> N/S DD° MM.MMM'

[Drop Table]

Mit folgenden Funktionen lassen sich geografische Koordinaten vom Typ Float in lesbares String-Format (N 53° 12.345' und zuück konvertieren.

function SingleCoordString(value: Double; IsLatitude: Boolean): String;
// Umwandeln eines Koordinatenwertes DD.DDDDD in X DD° MM.MMM'
// X kann N/S/W/E sein.


function CoordStrToFloat(sWert:String)ouble;
// Umwandeln eines Koordinatenwertes X DD° MM.MMM' in DD.DDDDD

Delphi-Quellcode:

function SingleCoordString(value: Double; IsLatitude: Boolean): String;
var sDeg, sMin: String;
begin
  DegToDegMinStr(Abs(value), sDeg, sMin);
  case IsLatitude of
    false: if value < 0 then
                Result := 'W ' + Right(sDeg,3,'0') + '° ' + Right(sMin,6,'0')+''''
           else Result := 'E ' + Right(sDeg,3,'0') + '° ' + Right(sMin,6,'0')+'''';
    true : if value < 0 then
                Result := 'S ' + Right(sDeg,2,'0') + '° ' + Right(sMin,6,'0')+''''
           else Result := 'N ' + Right(sDeg,2,'0') + '° ' + Right(sMin,6,'0')+'''';
  end;
end;
 

function DegMinStrToDeg(sDeg, sMin: String; Direction: Char): Double;
var Sign: Double;
    dDeg: Double;
    dMin: Double;
    bkDecSep : char;
begin
  ReplaceInString(sMin, ',', '.');
  bkDecSep := DecimalSeparator;
  DecimalSeparator := '.';
  if Direction in ['W','S'] then Sign := -1.0 else Sign := 1.0;
  try
    dDeg := StrToFloat(sDeg);
    dMin := StrToFloat(sMin);
    result := (dDeg + dMin / 60) * Sign;
  except
    result := -999;
  end;
  DecimalSeparator := bkDecSep;
end;

function ReplaceInString(var sSource: String; sSearch, sReplace: String): Integer;
var nRes: Integer;
    apos: Integer;
    sRest: String;
begin
  nRes := 0;
  repeat
    apos := Pos(sSearch, sSource);
    if (apos > 0) then
    begin
      Inc(nRes);
      sRest := Copy(sSource, apos + Length(sSearch),
               Length(sSource) - apos - Length(sSearch) + 1);
      sSource := Copy(sSource, 1, apos - 1) + sReplace + sRest;
    end;
  until (apos < 1) or (nRes > 9999);
  result := nRes;
end;

FUNCTION Right(Instring : String; max : Byte; Filler : Char) : String;
{ Diese Funktion füllt Instring mit max Fillchar rechtsbündig auf }
VAR Rzeile : String;
    i      : Integer;
BEGIN  {--- OF FUNCTION Right }
 RZeile   := '';
 InString := Trim(InString);
 i := (max - Length(Instring));
 If i > 0 Then
    For i := 1 To (max - Length(Instring)) Do
        Rzeile := Rzeile + Filler;
 Right := Rzeile + Instring;
END;  {--- OF FUNCTION Right }

function CoordStrToFloat(sWert:String):Double;
// Umwandeln eines Koordinatenwertes X DD° MM.MMM' in DD.DDDDD
var HR, sDeg, sMin : String;
begin
  HR   := Wort(sWert, 1);
  sDeg := Wort(sWert, 2);
  sMin := Wort(sWert, 3);
  ReplaceInString(sDeg, '°','');
  ReplaceInString(sMin, '''','');
  Result := DegMinStrToDeg(sDeg,sMin, HR[1]);
end;


function DegMinStrToDeg(sDeg, sMin: String; Direction: Char): Double;
var Sign: Double;
    dDeg: Double;
    dMin: Double;
    bkDecSep : char;
begin
  ReplaceInString(sMin, ',', '.');
  bkDecSep := DecimalSeparator;
  DecimalSeparator := '.';
  if Direction in ['W','S'] then Sign := -1.0 else Sign := 1.0;
  try
    dDeg := StrToFloat(sDeg);
    dMin := StrToFloat(sMin);
    result := (dDeg + dMin / 60) * Sign;
  except
    result := -999;
  end;
  DecimalSeparator := bkDecSep;
end;

Happy Navigating

Edit: function SingleCoordString hinzugefügt