Large Data Set Flashcards
What are the 5 UK locations?
- Leuchars - Scotland
- Leeming - North Yorkshire
- Heathrow - London
- Hurn - Dorset (south)
- Camborne - Cornwall
What are the 3 international locations?
- Beijing - China (northern hemisphere)
- Perth - Australia (southern hemisphere)
- Jacksonville - Florida, USA (northern hemisphere)
What are the two time periods that the large data set covers?
- May to October 1987
- May to October 2015
Which months have 31 days and which have 30?
31 - May, July, August, October
30 - June, September
What 9 data variables do the UK locations have?
- Daily mean temperature
- Daily total rainfall
- Daily total sunshine
- Daily maximum relative humidity
- Daily mean windspeed and direction
- Daily maximum gust and direction
- Cloud cover
- Daily mean visibility
- Daily mean pressure
What 4 data variables do the international locations have?
- Daily mean temperature
- Daily total rainfall
- Daily mean pressure
- Daily mean windspeed
What units is daily mean temperature measured in?
Degrees Celsius
What units is daily total rainfall measured in?
Millimetres (mm)
What units is daily total sunshine measured in?
Hours (hr)
What is daily maximum relative humidity given as?
A percentage
What units is daily mean windspeed and direction measured in? What is the Beaufort conversion?
Windspeed - knots (1 knot = 1.15 mph)
The Beaufort conversion is when windspeed is described (e.g. light, calm etc.)
Direction is given in degrees and also as a cardinal direction (north, south etc.)
What units is daily maximum gust and direction measured in?
Same units as windspeed (knots for speed and degrees (+ cardinal direction) for direction)
What units is cloud cover measured in?
Measured in Oktas (eighths of the sky covered by cloud)
What units is daily mean visibility measured in?
Measured in decametres (1 Dm = 10 m) horizontally
What units is daily mean pressure measured in?
Measured in hectopascals (1 hPa = 100 Pa = 1 millibar)
Which variable is discrete?
Cloud cover
What anomaly happened on the 15-16 October 1987 in the UK?
The great storm
How many days does the large data set cover?
184
What is unknown for the first half of May 1987 in the UK cities?
Daily total sunshine, mean windspeed and maximum gust
What are missing or unknown pieces of data listed as?
n/a or -
What is written for a value of rainfall that is <0.05mm?
‘Tr’
What value can be taken when rainfall is listed as ‘tr’?
You can use 0 or 0.025 for rainfall that is listed as ‘tr’
What should happen to the data before samples are taken and why?
It should be cleaned to remove missing values or non-numerical values e.g. ‘tr’
What is standard air pressure?
1013 hPa
