Within the UncertWeb project the ifgi provides a SOS with parts of the AirBase dataset provided by the EEA. Release **0.1-15** contains a great demo on what you can do with that data: How to build up a **spatial interpolation**, in this case inverse distance weighting (IDW), on top of a GetObservation result. This comprises some data formatting and **spatial projection**.

Thanks go to Edzer Pebesma for contributing the interpolation examples using the packages `gstat`

and `spacetime`

and pointing out bugs in the package!

Some plots generated by the demo are:

- overview plot of the available offerings,
- a histogram of all downloaded NO2 values,
- a bubble plot of the data for Germany,
- the stations in Germany in an UTM projection,
- two IDW interpolations, one aggregated over time and one for a specific time stamp, and last but not least
- a time series plot for a whole year for one station including a polynomically fitted regression line.

Go ahead and run the analysis yourself:

library("sos4R") demo("airquality")