README.md

In markwh/envirofacts: Access EPA Data via the Envirofacts Web Services

Envirofacts

R bindings for EPA Envirofacts API.

The envirofacts package provides a set of functions for accessing data in the Environmental Protection Agency's envirofacts set of web services.

Information about a service can be found using the envir_serviceInfo() function. Calling this function with no argument will retrieve the full list of services.

library(envirofacts)
envir_serviceInfo("radnet")

Data-access functions all begin with the service name, followed by an underscore then the table name. Calling these functions with no argument returns the first 5 rows of the table. For example, the following accesses the service area table from the Safe Drinking Water Information System service.

sdwis_service_area()

Subsets of these tables can be accessed by giving specific arguments to the access function.

sdwis_service_area(PRIMACY_AGENCY_CODE = "01", EPA_REGION = "01", 
                   PWS_TYPE_CODE = "CWS", SERVICE_AREA_TYPE_CODE = "RA")

Special operator functions can also be used to subset the data. Available options are >, <, != (for "not equal"), BEGINNING (meaning "begins with"), and CONTAINING. These can be provided as the first element of a length-two character vector, with the second element being the value that is being compared.

sdwis_service_area(PWSID = c("BEGINNING", "01010"))

Because some of these requests take a very long time, they have a built-in timeout, which can be changed by setting the "timeout" option: options("timeout").

markwh/envirofacts documentation built on May 21, 2019, 12:26 p.m.