MAP_OZ: Map Opportunity Zones
In Zandjy0/MAP_OZ: Mapping OZ

A function to find census key, chart addresses, and evaluates whether the address is within the CDFI opportunity zones (OZ). To run this function you must obtain a google API key by setting up an account here (https://developers.google.com/maps/documentation/embed/get-api-key).
Created by Steven J. Barbeaux January 25, 2019

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MAP_OZ(DIR = ".", ADDRESS = address, ZOOM = 17, OZ_CHECK = TRUE,
  MAP = TRUE, PDF = TRUE, PDF_NAME = "MAPS.pdf", XL_OUT = FALSE,
  XL_NAME = "OZ_MAP.xlsx", API_KEY = api_key)

`ADDRESS`	is the vector of address/es which can be input singularly following the format: address="1600 Pennsylvania Avenue NW, Washington, DC, 20500" or it can be input as a list in a .csv or .xlsx file with a column with the addresses named "addresses" and each row seperate as in: addresses "5339 ESSERVILLE RD, NORTON, VA, 24273" "1305 11th Ave SE, Hickory, NC, 28602" "1836 SUNDANCE CIR, Yadkinville, NC, 27055"
`ZOOM`	allows one to change the scale of the map from 1 (lowest resolution) to 20 (highest resolution).
`OZ_CHECK`	set to TRUE causes the program to evaluate whether the property is within a CDFI OZ, FALSE skips this check.
`MAP`	set to TRUE outputs map to either the screen or to PDF as described below.
`PDF`	set to TRUE outputs a PDF file with the sattelite maps, one page per address. FALSE plots the maps in an R window.
`PDF_NAME`	is the name of the PDF file to be exported.
`XL_OUT`	set to TRUE exports an Excel file to the working directory of the addresses with Census tract id and OZ determination.
`XL_NAME`	set to the name of the Excel file you wish to write, this program will over write any files of the same name.
`API_KEY`	is the google API key for google maps.