aqs_quarterlydata {raqs}

AQS API Quarterly Summary Data service

Description

A collection of functions to fetch data summarized at the calendar quarter level. Data is labeled with quarter number (Q1 = Jan - Mar, Q2 = Apr - Jun, Q3 = Jul - Sep, Q4 = Oct - Dec). Note that only the year portion of the bdate and edate are used and all 4 quarters in the year are returned. In addition, duration is not allowed on the API unlike aqs_sampledata, aqs_dailydata, and aqs_annualdata.

Usage

aqs_quarterlydata(
  aqs_filter = c("bySite", "byCounty", "byState", "byBox", "byCBSA"),
  aqs_variables = NULL,
  header = FALSE,
  ...
)

quarterlydata_bysite(
  param,
  bdate,
  edate,
  state,
  county,
  site,
  email = get_aqs_email(),
  key = get_aqs_key(),
  cbdate = NULL,
  cedate = NULL,
  header = FALSE,
  ...
)

quarterlydata_bycounty(
  param,
  bdate,
  edate,
  state,
  county,
  email = get_aqs_email(),
  key = get_aqs_key(),
  cbdate = NULL,
  cedate = NULL,
  header = FALSE,
  ...
)

quarterlydata_bystate(
  param,
  bdate,
  edate,
  state,
  email = get_aqs_email(),
  key = get_aqs_key(),
  cbdate = NULL,
  cedate = NULL,
  header = FALSE,
  ...
)

quarterlydata_bybox(
  param,
  bdate,
  edate,
  minlat,
  maxlat,
  minlon,
  maxlon,
  email = get_aqs_email(),
  key = get_aqs_key(),
  cbdate = NULL,
  cedate = NULL,
  header = FALSE,
  ...
)

quarterlydata_bycbsa(
  param,
  bdate,
  edate,
  cbsa,
  email = get_aqs_email(),
  key = get_aqs_key(),
  cbdate = NULL,
  cedate = NULL,
  header = FALSE,
  ...
)

Arguments

aqs_filter

A string specifying one of the service filters. NOT case-sensitive.

aqs_variables

A named list of variables to fetch data (e.g., state). Only necessary variables are passed to a specific endpoint (service/filter) to make a valid request.

header

A logical specifying whether the function returns additional information from the API header. Default is FALSE to return data only.

...

Reserved for future use.

param

A string or vector of strings specifying the 5-digit AQS parameter code for data selection. An integer will be coerced to a string. A maximum of 5 parameter codes may be listed in a single request. A list of the parameter codes can be obtained via list_parametersbyclass.

bdate

A string specifying the begin date of data selection in YYYYMMDD format. Only the year portion is used.

edate

A string specifying the end date of data selection in YYYYMMDD format. Only the year portion is used. If the end date is not in the same year as the begin date, the function will automatically split the date range into multiple chunks by year and send requests sequentially.

state

A string specifying the 2-digit state FIPS code. An integer will be coerced to a string with a leading zero if necessary (e.g., 1 -> "01"). A list of the state codes can be obtained via list_states.

county

A string specifying the 3-digit county FIPS code. An integer will be coerced to a string with leading zeros if necessary (e.g., 89 -> "089"). A list of the county codes within each state can be obtained via list_countiesbystate.

site

A string specifying the 4-digit AQS site number within the county. An integer will be coerced to a string with leading zeros if necessary (e.g., 14 -> "0014"). A list of the site codes within each county can be obtained via list_sitesbycounty.

email

A string specifying the email address of the requester. If you set your email and key with set_aqs_user, you don't have to specify this.

key

A string specifying the key matching the email address for the requester. If you set your email and key with set_aqs_user, you don't have to specify this.

cbdate

(optional) A string specifying the change begin date in YYYYMMDD format to subset data based on "date of last change" in database. Only data that changed on or after this date will be returned.

cedate

(optional) A string specifying the change end date in YYYYMMDD format to subset data based on "date of last change" in database. Only data that changed on or before this date will be returned.

minlat

A string or numeric value specifying the minimum latitude of a geographic box. Decimal latitude with north being positive.

maxlat

A string or numeric value specifying the maximum latitude of a geographic box. Decimal latitude with north being positive.

minlon

A string or numeric value specifying the minimum longitude of a geographic box. Decimal longitude with east being positive.

maxlon

A string or numeric value specifying the maximum longitude of a geographic box. Decimal longitude with east being positive.

cbsa

A string specifying the AQS CBSA code. A list of the CBSA codes can be obtained via list_cbsas.

Details

aqs_quarterlydata sends a request to the AQS API based on a user-provided filter using the following underlying functions:

• quarterlydata_bysite returns quarterly summary param data for site in county, within state, based on the year portions of bdate and edate.

• quarterlydata_bycounty returns quarterly summary param data for county in state based on the year portions bdate and edate.

• quarterlydata_bystate returns quarterly summary param data for state based on the year portions of bdate and edate.

• quarterlydata_bybox returns quarterly summary param data for a user-provided latitude/longitude bounding box (minlat, maxlat, minlon, maxlon) based on the year portions of bdate and edate.

• quarterlydata_bycbsa returns quarterly summary param data for a user-provided CBSA based on the year portions of bdate and edate.

Value

A data.frame containing parsed data or a named list containing header and data.

Examples

## Not run: 

## Set your API Key first using set_aqs_user to run the following codes

## Example from the AQS website
## FRM/FEM PM2.5 data for Wake County, NC for 2016
## Only the year portions of bdate and edate are used
aqs_variables <- list(
  param = c("88101", "88502"), bdate = "20160101", edate = "20160228",
  state = "37", county = "183"
)
aqs_quarterlydata(aqs_filter = "byCounty", aqs_variables = aqs_variables)

## Equivalent to above; used integers instead of strings
quarterlydata_bycounty(
  param = c(88101, 88502), bdate = "20160101", edate = "20160228",
  state = 37, county = 183
)

## End(Not run)