IS428 AY2019-20T1 Assign Lim Zi Yuan 1
VAST 2019 MC2: Citizen Science to the Rescue
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Identify areas where radiation over background is detected over time for Static and Mobile sensors
Historically, radiation levels of 25-75cpm are considered as background radiation. Any value higher than 75, we will treat as value "Alert".
Static Sensors
Without additional information, it is difficult to ascertain exactly which areas have radiation over the background period. Looking at our other charts, we see spikes in radiation levels for static data from 8th April onward. Majority of the data points fall below 75cpm, by filtering them out we can estimate which areas are more likely to have higher radiation over the background period from when the earthquake hit. From the chart below, we can see that Static Sensor 12 and 13 have a greater concentration of values above 75 cpm which is possible considering their close proximity towards the Nuclear Plant.
Mobile Sensors
At a glance, it would appear that other than Wilson Forest, every neighborhoods radiation levels are within background levels. Wilson Forest has an average cpm of 945.2 over the course of 5 days.
However, by taking a closer look at the mobile readings, we are able to see that some sensors detect radiation spikes of over 75cpm and even in the thousand range.
The following chart shows the congregation of data points that are above 75cpm for mobile sensors. We can see that there is a high volume of data points from the third day onward for some of the neighbourhoods. This would likely indicate that the Earthquake happened some time during 8th April
