Tools, a Processing sketch working with Rijkscoordinaten and longitude latitude

There was a request for a sketch to convert Rijkscoordinaten (Dutch coordinates) to Longitue and latitude. The next question was how to display the longitude, latitude data on a map of Rotterdam.

I made the sketch and tested it with GPS data I obtained with a DIY contraption: SDcard shield on an Arduino and a GPS module:

Here is the equipment:

Then the next step is to get the GPS data and plot these on a map in Processing. (Actually plotting directly in Google Earth would be easier, but now we have a great opportunity to LEARN something).

I used this sketch:

and got this plot of my tour on bicycle from home to my studio, and from there along the river Rotte, (very green and nice, and just in time before the batteries ran out):

Here is the Processing sketch which made this all possible:

http://www.contrechoc.com/crosslab/RDM2Lat_Lon_with_Map.zip

There are quite a few conversion inside this sketch, and a calibration by hand of the image.