isdparser
Parse 'NOAA' Integrated Surface Data Files
Tools for parsing 'NOAA' Integrated Surface Data ('ISD') files, described at < https://www.ncdc.noaa.gov/isd>. Data includes for example, wind speed and direction, temperature, cloud data, sea level pressure, and more. Includes data from approximately 35,000 stations worldwide, though best coverage is in North America/Europe/Australia. Data is stored as variable length ASCII character strings, with most fields optional. Included are tools for parsing entire files, or individual lines of data.
isdparser is a parser for 'NOAA' Integrated Surface Data ('ISD') files, described at https://www.ncdc.noaa.gov/isd. ISD includes numerous parameters such as wind speed and direction, wind gust, temperature, dew point, cloud data, sea level pressure, altimeter setting, station pressure, present weather, visibility, precipitation amounts for various time periods, snow depth, and various other elements as observed by each station. Data is stored as variable length ASCII character strings, with most fields optional. Included are tools for parsing entire files, or individual lines of data.
Coverage
ISD is a global database, with data from approximately 35,000 stations worldwide, though the best spatial coverage is evident in North America, Europe, Australia, and parts of Asia. Coverage in the Northern Hemisphere is better than the Southern Hemisphere, and the overall period of record is currently 1901 to present.
Code liberated from rnoaa to focus on ISD parsing since it's sorta
complicated. Has minimal dependencies, so you can parse your ISD/ISH
files without needing the deps that rnoaa needs. Will be used by
rnoaa once on CRAN.
Documentation at ftp://ftp.ncdc.noaa.gov/pub/data/noaa/ish-format-document.pdf
API:
isd_parse()- parse all lines in a file, with parallel optionisd_parse_line()- parse a single line - you choose which lines to parse and how to apply the function to your linesisd_transform()- transform ISD data variables
Installation
CRAN stable version
install.packages("isdparser")Dev version
devtools::install_github("ropensci/isdparser")library('isdparser')Parse lines from an ISD file
path <- system.file('extdata/024130-99999-2016.gz', package = "isdparser")lns <- readLines(path, encoding = "latin1")isd_parse_line(lns[1])#> # A tibble: 1 x 38#> total_chars usaf_station wban_station date time date_flag latitude#> <chr> <chr> <chr> <chr> <chr> <chr> <chr> #> 1 0054 024130 99999 2016… 0000 4 +60750 #> # ... with 31 more variables: longitude <chr>, type_code <chr>,#> # elevation <chr>, call_letter <chr>, quality <chr>,#> # wind_direction <chr>, wind_direction_quality <chr>, wind_code <chr>,#> # wind_speed <chr>, wind_speed_quality <chr>, ceiling_height <chr>,#> # ceiling_height_quality <chr>, ceiling_height_determination <chr>,#> # ceiling_height_cavok <chr>, visibility_distance <chr>,#> # visibility_distance_quality <chr>, visibility_code <chr>,#> # visibility_code_quality <chr>, temperature <chr>,#> # temperature_quality <chr>, temperature_dewpoint <chr>,#> # temperature_dewpoint_quality <chr>, air_pressure <chr>,#> # air_pressure_quality <chr>,#> # AW1_present_weather_observation_identifier <chr>,#> # AW1_automated_atmospheric_condition_code <chr>,#> # AW1_quality_automated_atmospheric_condition_code <chr>,#> # REM_remarks <chr>, REM_identifier <chr>, REM_length_quantity <chr>,#> # REM_comment <chr>Or, give back a list
head( isd_parse_line(lns[1], as_data_frame = FALSE))#> $total_chars#> [1] "0054"#> #> $usaf_station#> [1] "024130"#> #> $wban_station#> [1] "99999"#> #> $date#> [1] "20160101"#> #> $time#> [1] "0000"#> #> $date_flag#> [1] "4"Parse an ISD file
path <- system.file('extdata/024130-99999-2016.gz', package = "isdparser")isd_parse(path)#> # A tibble: 2,601 x 38#> total_chars usaf_station wban_station date time date_flag latitude#> <chr> <chr> <chr> <chr> <chr> <chr> <chr> #> 1 0054 024130 99999 2016… 0000 4 +60750 #> 2 0054 024130 99999 2016… 0100 4 +60750 #> 3 0054 024130 99999 2016… 0200 4 +60750 #> 4 0054 024130 99999 2016… 0300 4 +60750 #> 5 0054 024130 99999 2016… 0400 4 +60750 #> 6 0039 024130 99999 2016… 0500 4 +60750 #> 7 0054 024130 99999 2016… 0600 4 +60750 #> 8 0039 024130 99999 2016… 0700 4 +60750 #> 9 0054 024130 99999 2016… 0800 4 +60750 #> 10 0054 024130 99999 2016… 0900 4 +60750 #> # ... with 2,591 more rows, and 31 more variables: longitude <chr>,#> # type_code <chr>, elevation <chr>, call_letter <chr>, quality <chr>,#> # wind_direction <chr>, wind_direction_quality <chr>, wind_code <chr>,#> # wind_speed <chr>, wind_speed_quality <chr>, ceiling_height <chr>,#> # ceiling_height_quality <chr>, ceiling_height_determination <chr>,#> # ceiling_height_cavok <chr>, visibility_distance <chr>,#> # visibility_distance_quality <chr>, visibility_code <chr>,#> # visibility_code_quality <chr>, temperature <chr>,#> # temperature_quality <chr>, temperature_dewpoint <chr>,#> # temperature_dewpoint_quality <chr>, air_pressure <chr>,#> # air_pressure_quality <chr>,#> # AW1_present_weather_observation_identifier <chr>,#> # AW1_automated_atmospheric_condition_code <chr>,#> # AW1_quality_automated_atmospheric_condition_code <chr>,#> # REM_remarks <chr>, REM_identifier <chr>, REM_length_quantity <chr>,#> # REM_comment <chr>process in parallel
isd_parse(path, parallel = TRUE)Meta
- Please report any issues or bugs.
- License: MIT
- Get citation information for
isdparserin R doingcitation(package = 'isdparser') - Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.
News
isdparser 0.3.0
MINOR IMPROVEMENTS
- towards working on integrating metadata for each of the data fields, we've incorporated a data.frame of metadata into the package. see
?isd_metadata. eventually we'd like to allow conversions and such on the data based on units (#12)
BUG FIXES
- fix to internal parsing of string; first remove REM section from the ADD section so that codes in REM that happen to match those in ADD aren't detected spuriously (#15) thanks @ezwelty
isdparser 0.2.0
NEW FEATURES
- New function
isd_transform()that transforms some variables in ISD output data - but not all. This functionality used to be done by default inisd_parse()andisd_parse_line()- but data transforming yanked out as separate step done withisd_transform()(#11) - Both
isd_parse()andisd_parse_line()gain new parameteradditionalto optionally include additional and remarks data sections in output (#10)
BUG FIXES
- Fixed a bug in
isd()in which a data section was not parsed correctly. (#9)
isdparser 0.1.0
NEW FEATURES
- Released to CRAN.