Archive for December, 2009

General meteorlogical data viewer

Here another result of my experiments with weather data. This visualization is not very useful yet, but maybe you will find it interesting. I made a simple parsing algorithm to filter out the geografic locations of the weather stations. I have to improve that parsing, since makes some mistakes, e.g. ‘ZEE’ is actually ‘WIJK AAN ZEE’. Hopefully the KNMI can make the data files a bit more parsing friendly in the future.

I’m planning on making year comparisons. So you can see, for example, the temperature change over the years.

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Wind speed and wind direction visualization

Recently I found out that the KNMI publishes their data on the internet. I browsed around a little and downloaded some data.

As the title says, this visualization shows wind speed and wind direction. The country is The Netherlands and each arrow corresponds to a weather station.

The direction of an arrow represents the wind direction (DD). I decided to let the arrows point 180 degrees from the wind direction, i.e. if the wind direction is north, the arrow points towards the south. The size of each arrow represents the wind speed (FF).

These are the official variable descriptions:

DD = Windrichting (in graden) gemiddeld over de laatste 10 minuten van het afgelopen uur / Mean wind direction (in degrees) during the 10-minute period preceding the time of observation (360=noord/north, 90=oost/east, 180=zuid/south, 270=west, 0=windstil/calm 990=veranderlijk/variable)
FF = Windsnelheid (in 0.1 m/s) gemiddeld over de laatste 10 minuten van het afgelopen uur / Mean wind speed (in 0.1 m/s) during the 10-minute period preceding the time of observation

If DD equals 990, the chart shows a red circle with the radius in proportion to the wind speed (although this always seems to be equal to 10).

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