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setClass("SpatialPointsDataFrame",
representation("SpatialPoints", data = "data.frame", coords.nrs = "numeric"),
prototype = list(bbox = matrix(NA), proj4string = CRS(as.character(NA)),
coords = matrix(NA), data = data.frame(),
coords.nrs = numeric(0)),
validity = function(object) {
#if (!inherits(object@data, "data.frame"))
# stop("data should be of class data.frame")
if (nrow(object@coords) < 1)
stop("no points set: too few rows")
if (ncol(object@coords) <= 1)
stop("no points set: too few columns")
if (ncol(object@data) == 0)
stop("data.frame is empty (possibly after stripping coordinate columns): use SpatialPoints() to create points-only object")
if (nrow(object@data) != nrow(object@coords))
stop("number of rows in data.frame and SpatialPoints don't match")
n = length(object@coords.nrs)
if (n > 0 && n != ncol(object@coords))
stop("inconsistent coords.nrs slot")
return(TRUE)
}
)
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