SatelliteDust

3D graphics with varying appearance according to the GPS and QZSS signal.

This app is a 3D graphics environmental software which changes appearance according to received GPS and QZSS satellites.

It utilizes OpenGL ES 2.0 to draw a simple geometric object at the center and dancing shiny particles around it.

These particles represents signals coming from satellites. As more satellite signals your device catches, the more particles will be drawn. They are trapped around the object and keep moving until they run out of their lifetime.

This app does not do anything practical. Just keep staring as the particles move and whirl around.

At it's very initial stage, the app does not have any adjustable settings yet, but future versions will have more setting parameters.

To obtain the almanac to decide the expected locations of the satellites, this app makes use of an API offered by JAXA (qz-vision.jaxa.jp). That's why this app requires network connection. And it also requires low-resolution and high-resolution location service to receive signals from the GPS and QZSS satellites.

The author thanks to the following sites/people for detailed explanation and codes regarding the calculation of the satellites location from the almanac data.

Nyanchew's DigitalLife(nyanchew.com)、

GPS(gps.sublimeblog.net)、

www.gpstk.org