StationDataLoader

For people wishing to make use of London Cycle Hire station data, this repository holds routines for accessing the data.

###Purpose: Gather station data into a form that can be used in other analyses
Provide sequential access to station data via an iterator

Concepts:

A stationDataSnap is a set of measurements of the state of all of the reporting stations at a point in time.
StationData is composed of a sequence of days on which station data has been gathered.
The data for each day comprises a time-sequence of stationDataSnaps

Routines assume that raw station data, in the form of .csv files, are held in a directory such as "..\..\Data\Station Data\Station Status 2014 15 mins Cleansed\" Routines put processed data in "..\..\Data\Station Data\"

####Scripts
Normally these should be run in the order mentioned.

stationDataPrep3.R
Reads in all the .csv files in a nominated directory (configure this)
Writes out cleaned files to target directory
Also writes out StationLUTyy.Rdata and ..csv
Uses:
1.1 addStationNumbers3
stationData names used to look up stationNumbers.
getLatLons.R
Rewrites StationLUTyy.Rdata and ..csv to add lat-lons from station data files
stationDataLoader.R
Loads all the .csv station data data files in a particular folder, e.g., cleaned
into a single data frame, stored as an SDyy.Rdata object in the Station Data directory
lumpSmallStationData.R DEVELOPMENT PAUSED Produces new SDL or SDM .. yy.Rdata object in which low-use stations are aggregated
getDayStationData.R
Retrieve all station data for a given date
initStationSnap
set iterator to retrieve first of a sequence of stationDataSnaps from the current day's data:

initStationSnap ()
- creates envStationSnap, and assigns it to .GlobalEnv
- calls getDayStationData:
  - sets date in envStationSnap
  - loads year station data
  - extracts day needed, filtering out invalid stations using latitude
  - assigns year station data to environment
  - assigns day station data to environment
- initializes the time range
- sets cursor to 0

next StationSnap
iterator to retrieve each of a sequence of stationDataSnaps from the current day's data:

nextStationSnap()
- gets all data after cursor
- returns NULL if no data meet condition
- gets the first time stamp in that data
- selects only data at the time stamp
- selects relevant columns
- advances cursor
- calls cleanStationSnap()
- replaces all-zero data with NAs
- returns snap

getStationSnap
get the stationSnap for a particular time, if it is available. if not, return NULL

gsimpso4/StationDataLoader

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