[Digikam-devel] GPS wrong coordinate conversion?

[Caulier Gilles]

Le Vendredi 08 Septembre 2006 05:43 PM, Arnd Baecker a écrit :
> Hi,
>
> maybe I am wrong, but I think that the conversion in the example
> given at
> http://docs.kde.org/development/en/extragear-graphics/digikam/using-kapp-ca
>mera.html#using-kapp-gps is not correct:
>
> """The positional data (e.g. 13.44088333) must be converted into H.MS
> format (13.235990) and split into its constituents as shown in the given
> example."""
>
> which leads to the entry
>   add Exif.GPSInfo.GPSLatitude Rational "13/1 23/1 5990/100"
>
> Doesn't 13.44088333 convert to: 13 26 27.18:
>   int(13.44088333)       = 13
>   int(0.44088333*60)     = 26
>   (0.44088333*60-26) *60 = 27.18
>
> The converter at http://www2.comp.polyu.edu.hk/~04329143d/Location.html
> also gives these numbers.
> If this is correct, it should read
>   add Exif.GPSInfo.GPSLatitude Rational "13/1 26/1 2718/100"
>
> The other way round, "13/1 23/1 5990/100"
> would correspond to: 13.399972.
>
> Best, Arnd

Arnd, 

The code relevant of GPS position decoding is in this source file :

http://websvn.kde.org/trunk/extragear/graphics/digikam/libs/widgets/metadata/gpswidget.cpp?rev=580664&view=auto

Look the method decodeGPSPosition() at end of file.

I'm busy this week end to check if something is wrong...

Gerhard, can you check this part please. Thanks in advance.

Gilles