Letten is a place at the Limmat river right behind the ZHdK building in Zürich.

The project idea is described here:

http://makeopendata.ch/forum/discussion/5/physical-mashup-of-a-multicolor-led-and-the-current-water-temperature-at-letten-environmental-data

The aim of OpenLetten is to show how hard it is to parse data if the publisher choses to support only the human readable data format (here PDF ), and how easy it becomes to build novel applications once the data is (re-)published in an open, machine readable data format (e.g. CSV or RSS ).

• http://www.hw.zh.ch/hochwasser/mac/at/0851.PDF (Source data, PDF )
• https://pachube.com/feeds/36745 (“Open” data, available as XML, JSON, CSV feed)
• http://www.tamberg.org/makeopendata/2011/googlecharts.html (Google Chart visualisation, JSONP)
• http://www.tamberg.org/makeopendata/2011/pachudial.html (PachuDial visualisation, Flash)
• http://www.tamberg.org/makeopendata/2011/jquery.html (Simple visualisation, JSONP)

• tamberg

• http://sourceforge.net/projects/itextsharp/files/ ( PDF to text C# library)
• http://www.paravan.ch/geocaching/#tools (CH-1903 to WGS-84 coordinate converter)
• http://code.google.com/apis/chart/ (Image and Javascript API for visualisation)
• http://en.wikipedia.org/wiki/JSONP (Cross site scriptable JSON API convention)
• https://pachube.com/ (Sensor data platform based on open standards)
• http://yaler.org/ (Access to LED Web service running on Arduino)