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#' GMLGridEnvelope
#'
#' @docType class
#' @importFrom R6 R6Class
#' @export
#' @keywords ISO GML Grid Envelope
#' @return Object of \code{\link{R6Class}} for modelling an GML grid envelope
#' @format \code{\link{R6Class}} object.
#'
#' @references
#' ISO 19136:2007 Geographic Information -- Geographic Markup Language.
#' http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32554
#'
#' OGC Geography Markup Language. http://www.opengeospatial.org/standards/gml
#'
#' @author Emmanuel Blondel <emmanuel.blondel1@@gmail.com>
#'
GMLGridEnvelope <- R6Class("GMLGridEnvelope",
inherit = GMLAbstractObject,
private = list(
xmlElement = "GridEnvelope",
xmlNamespacePrefix = "GML"
),
public = list(
#'@field low low value [\code{\link{matrix}}]
low = matrix(NA_real_, 1, 2),
#'@field high high value [\code{\link{matrix}}]
high = matrix(NA_real_, 1, 2),
#'@description This method is used to instantiate a GML envelope. The argument 'bbox'
#' should be a matrix of dim 2,2 giving the x/y min/max values of a bouding box,
#' as returned by \code{bbox} function in package \pkg{sp}
#'@param xml object of class \code{XMLInternalNode-class} from \pkg{XML}
#'@param bbox object of class \code{matrix}
initialize = function(xml = NULL, bbox){
super$initialize(xml, element = private$xmlElement, wrap = TRUE)
if(is.null(xml)){
if(!is(bbox, "matrix")) stop("Input 'bbox' object should be a 'matrix'")
self$low = t(bbox[,1L])
self$high = t(bbox[,2L])
}
}
)
)
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