Xavier Bordoy

2016-10-09

- We put the watering can to filling up
- We obtained these mesures: weight of the water and the volume of the water inside watering can
- Dimensions of watering can: radious (zoom), cover, angle of the cover, length (zoom)
- Can you find how much it rained (in liter per square meter)?

- If we know the records of near weather stations, can we estimate how much did it rain in our house?
- In what time this method would not be applicable? How many points (weather stations) do we need to apply this method?
- Can you apply it here?
- Can you estimate how much did it rain in red point? The raw data is available here (file is encoding with
`ISO-8859-14`

(AEMET 2016)).

- Can we find the distance between our house and storm if we know that there is a gap of \(n\) seconds between thunder and lightning?
- Speed of light (Wikipedia 2016a)
- Speed of sound (Wikipedia 2016b)

- In “How much did it rain? bis”, we can introduce baricentric coordinates and see that we need at least 3 points to assure the procedure is trustworthy. In this case we get a “geometric mean” of the stations.

The author of this document is Xavier Bordoy. The first version was created on October 9th 2016. The document was released under the license Creative Commons Attribution 4.0 International (CC BY 4.0).

AEMET. 2016. “Precipitación 00-24h (Mm) En Jueves, 6 de Octubre de 2016.” http://www.aemet.es/es/eltiempo/observacion/ultimosdatos?k=bal&w=2&datos=img&x=d05&f=pre_0024.

Wikipedia. 2016a. “Speed of Light.” https://en.wikipedia.org/wiki/Speed_of_light.

———. 2016b. “Speed of Sound.” https://en.wikipedia.org/wiki/Speed_of_sound.