read_chl_ffcul: Reads the Digitisations of Clilean Surface Records 1950-1958...

In mcmventura/fcdata2qc: FCiências.ID recovered data to C3S Quality Control

Description

Reads one text file with the station metadata and twelve text files with the digitisation tables for each month of a station-year. As all the data was typed, performs the quality control of the station metadata and checks for table format errors and typing errors.

Usage

read_chl_ffcul(obstxt)

Arguments

obstxt

Character string giving the path of the metadata file.

Details

Input:

• One text file with the metadata - 'StationName_Obs_YYYY.txt'. The following constants are read from the metadata file:

  • WIGOS compatible station identifier

  • Observations year

  • Longitude

  • Latitude

  • Altitude

  • 'msl pressure' or 'surface pressure'

  • Real station name

• Twelve text files with the digitisations, which correspond to a digitisation table for each month of a station-year - 'StationName_Mth_YYYY.txt'. The digitisation tables have 13 columns with the following variables:

  Column 1

  Day of the observation

  Column 2

  Observation time in the format HHMM

  Column 3

  Dew point temperature in Celsius degrees (ºC)

  Column 4

  Cloud cover in oktas: 0,1,2,3,4,5,6,7,8,9

  Column 5

  Wind direction in 16-wind compass rose points, plus C - Calm

  Column 6

  Wind speed in knots (kn, kt)

  Column 7

  Atmospheric pressure - mean sea level or surface - in hectopascals (hPa)

  Column 8

  Air temperature in Celsius degrees (ºC)

  Column 9

  Acumulated precipitation in milimeters (mm) most commonly measured at 12:00 UTC

  Column 10

  Acumulated precipitation in milimeters (mm) most commonly measured at 23:00 UTC

  Column 11

  Minimum daily temperature in Celsius degrees (ºC) most commonly measured at 12:00 UTC

  Column 12

  Maximum daily temperature in Celsius degrees (ºC) most commonly measured at 23:00 UTC

  Column 13

  Relative humidity in percent

Output:

• A .RData and a .txt file with the metadata bellonging to a station-year: 'metadata_StationName_Year'.

• A .RData and a .txt file with the anual digitisation of station-year: 'digitisation_StationName_Year'.

• Eventually, one or two .txt files with typing errors to be corrected before proceeding with the quality control: 'Hour-errors_StationName_YYYY.txt' and 'Typing-errors_StationName_YYYY.txt'.

Value

A data frame with seventeen columns: WIGOS compatible station ID, day of the year, year, month, day, hour, dew point temperature, cloud cover, wind direction, wind speed, air pressure, air temperature, accumulated precipitation at first hour, accumulated precipitation at second hour, daily minimum temperature, daily maximum temperature, relative humidity.

mcmventura/fcdata2qc documentation built on June 5, 2019, 7:40 p.m.