R/lsQuery.R

In RGISTools: Handling Multiplatform Satellite Images

lsSearchQuery<-function(datasetName,startDate,endDate,sf.obj,...){
  args<-list(...)
  lsquery<-NULL
  #temporal filter
  lsquery$datasetName<- datasetName#'LANDSAT_8_C1'
  lsquery$temporalFilter<-list("startDate"=format(startDate,"%d-%m-%Y"),
                               "endDate"=format(endDate,"%d-%m-%Y"))
  #spatial filter
  lsquery$spatialFilter<-list("filterType"='mbr',
                              "lowerLeft"=list("latitude"=st_bbox(sf.obj)[["ymin"]],
                                               "longitude"=st_bbox(sf.obj)[["xmin"]]),
                              "upperRight"=list("latitude"=st_bbox(sf.obj)[["ymax"]],
                                                "longitude"=st_bbox(sf.obj)[["xmax"]]))
  if("cloudCover"%in%names(args)){
    if(length(args$cloudCover)==2&&class(args$cloudCover)=="numeric"){
      lsquery$minCloudCover<-min(args$cloudCover)
      lsquery$maxCloudCover<-max(args$cloudCover)
      if("includeUnknownCloudCover"%in%names(args)){
        lsquery$includeUnknownCloudCover<-args$includeUnknownCloudCover
      }else{
        lsquery$includeUnknownCloudCover<-"true"
      }
    }else{stop("cloudCover must be a numeric argument")}
  }

  
  #additional criteria
  lsquery$maxResults<-50000
  lsquery$startingNumber<-1
  lsquery$sortOrder<-"ASC"
  lsquery$apiKey<-getRGISToolsOpt("LS.EE.KEY")
  return(toJSON(lsquery))
}