EMISR: EMIS and GMIS data extraction and analyses

#' Marine protected area database description
#'
#' The shapefile of the marine protected area (MPA) was downloaded from
#' \url{http://www.protectedplanet.net} the 03/12/2014.
#' The shapefile was converted in SpatialPolygonsDataFrame using rgdal:
#' \code{mpa<-readOGR("EMISR/data/mpa/","mpa",encoding="Latin1")}
#' then mpa was splitted in two: mpa1 and mpa2.
#'
#' No projection system is available for this SpatialPolygonsDataFrame
#' due to coordinates problem.
#' 26 variables are available, describing the mpa characteristics (see reference).
#'
#' @format A SpatialPolygonsDataFrame with 4000 features (the first 4000 MPA according to their wdpaid)
#' @source \url{http://www.protectedplanet.net}
#' @references UNEP-WCMC (2012). Data Standards for the World Database on Protected Areas. UNEP-WCMC: Cambridge, UK.
#' @name mpa1
NULL

#' Marine protected area database description
#'
#' The shapefile of the marine protected area (MPA) was downloaded from
#' \url{http://www.protectedplanet.net} the 03/12/2014.
#' The shapefile was converted in SpatialPolygonsDataFrame using rgdal:
#' \code{mpa<-readOGR("EMISR/data/mpa/","mpa",encoding="Latin1")}
#' then mpa was splitted in two: mpa1 and mpa2.
#'
#' No projection system is available for this SpatialPolygonsDataFrame
#' due to coordinates problem.
#' 26 variables are available, describing the mpa characteristics (see reference).
#'
#' @format A SpatialPolygonsDataFrame with 5612 features (the last 5612 MPA according to their wdpaid)
#' @source \url{http://www.protectedplanet.net}
#' @references UNEP-WCMC (2012). Data Standards for the World Database on Protected Areas. UNEP-WCMC: Cambridge, UK.
#' @name mpa2
NULL