R/OM-methods-coercion.R

In 52North/sos4R: Client for OGC Sensor Observation Services

############################################################################## #
# Copyright (C) 2019 by 52 North                                               #
# Initiative for Geospatial Open Source Software GmbH                          #
#                                                                              #
# Contact: Andreas Wytzisk                                                     #
# 52 North Initiative for Geospatial Open Source Software GmbH                 #
# Martin-Luther-King-Weg 24                                                    #
# 48155 Muenster, Germany                                                      #
# info@52north.org                                                             #
#                                                                              #
# This program is free software; you can redistribute and/or modify it under   #
# the terms of the GNU General Public License version 2 as published by the    #
# Free Software Foundation.                                                    #
#                                                                              #
# This program is distributed WITHOUT ANY WARRANTY; even without the implied   #
# WARRANTY OF MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU #
# General Public License for more details.                                     #
#                                                                              #
# You should have received a copy of the GNU General Public License along with #
# this program (see gpl-2.0.txt). If not, write to the Free Software           #
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA or #
# visit the Free Software Foundation web page, http://www.fsf.org.             #
#                                                                              #
# Author: Daniel Nuest (daniel.nuest@uni-muenster.de)                          #
# Created: 2010-10-19                                                          #
# Project: sos4R - https://github.com/52North/sos4R                            #
#                                                                              #
############################################################################## #

#
#
#
as.data.frame.OmObservation = function(x, row.names, optional, ...) {
  return(sosResult(x))
}
setAs(from = "OmObservation", to = "data.frame",
      def = function(from) {
        as.data.frame.OmObservation(x = from)
      }
)

#
#
#
as.data.frame.OmMeasurement = function(x, row.names, optional, ...) {
  return(sosResult(x))
}
setAs(from = "OmMeasurement", to = "data.frame",
      def = function(from) {
        as.data.frame.OmMeasurement(x = from)
      }
)

#
#
#
as.list.OmObservationCollection = function(x, ...) {
  return(x@members)
}
setAs(from = "OmObservationCollection", to = "list",
      def = function(from) {
        as.list.OmObservationCollection(from)
      }
)

#
#
#
as.SpatialPointsDataFrame.OmObservationCollection = function(x, ...) {
  result <- sosResult(x, coordinates = TRUE)
  crs <- sosGetCRS(x)

  if (length(crs) > 1)
    stop("Spatial Reference System is not unambiguous, cannot convert.")

  spdf <- .resultDataFrameToSpatialPointsDataFrame(result = result,
                                                   crs = crs)
  return(spdf)
}
setAs(from = "OmObservationCollection", to = "SpatialPointsDataFrame",
      def = function(from) {
        as.SpatialPointsDataFrame.OmObservationCollection(from)
      }
)
setAs(from = "OmObservationCollection", to = "Spatial",
      def = function(from) {
        as.SpatialPointsDataFrame.OmObservationCollection(from)
      }
)

#
#
#
as.SpatialPointsDataFrame.OmObservation = function(x, ...) {
  crs <- sosGetCRS(x)
  result <- sosResult(x, coordinates = TRUE)

  spdf <- .resultDataFrameToSpatialPointsDataFrame(result = result,
                                                   crs = crs)
  return(spdf)
}
setAs(from = "OmObservation", to = "SpatialPointsDataFrame",
      def = function(from) {
        as.SpatialPointsDataFrame.OmObservation(from)
      }
)
setAs(from = "OmObservation", to = "Spatial",
      def = function(from) {
        as.SpatialPointsDataFrame.OmObservation(from)
      }
)

#
#
#
as.SpatialPointsDataFrame.OmMeasurement = function(x, ...) {
  crs <- sosGetCRS(x)
  result <- sosResult(x, coordinates = TRUE)

  spdf <- .resultDataFrameToSpatialPointsDataFrame(result = result,
                                                   crs = crs)
  return(spdf)
}
setAs(from = "OmObservation", to = "SpatialPointsDataFrame",
      def = function(from) {
        as.SpatialPointsDataFrame.OmObservation(from)
      }
)
setAs(from = "OmObservation", to = "Spatial",
      def = function(from) {
        as.SpatialPointsDataFrame.OmObservation(from)
      }
)

############################################################################## #
#
.resultDataFrameToSpatialPointsDataFrame <- function(result, crs) {
  coordCols <- match(c(sosDefaultColumnNameLon,
                       sosDefaultColumnNameLat),
                     colnames(result))

  spdf <- sp::SpatialPointsDataFrame(
    coords = result[, coordCols],
    data = result[, -coordCols],
    proj4string = crs)

  return(spdf)
}