cbase-essd: Cloud-base Tools

#' Retrieve and evaluate cloud bases from various satellite-borne
#' instruments
#'
#' The layout of this directory is as follows:
#'
#' For every retrieval method, there are two files, <retrieval>.gen.R
#' and <retrieval>.R.
#'
#' The purpose of <retrieval>.gen.R is to hold
#' functions that generate the retrievals from the precursor products
#' (for example, generate the C-BASE retrievals from the CALIOP VFM).
#' These functions should be exported so that it is possible to run
#' the retrieval algorithm over a bunch of input data from some driver
#' script, Makefile, or similar.
#'
#' The purpose of <retrieval>.R is to provide accessor functions so
#' that the retrievals can be loaded (typically as data.frames) into
#' code that does further processing, for example visualization,
#' combination with evaluation datasets, or evaluation.  In addition
#' to these accessor functions, reasonably small datasets should also
#' be made available as package data and described in data.R.
#'
#' Currently, files exist for the C-BASE CALIOP-based cloud base
#' retrieval (c-base.gen.R and c-base.R) and for the METAR
#' ground-based ceilometer evaluation dataset (metar.gen.R and
#' metar.R).  In the future, similar files are planned for cloud base
#' retrievals from MISR, oxygen A-band, and NPP cloud-base
#' temperature. 
#'
#' In addition to the retrieval-specific <retrieval>.gen.R and
#' <retrieval>.R files, the package consists of:
#'
#' \describe{
#' \item{combine.R}{Code to combine retrievals and evaluation datasets}
#' \item{eval.R}{Code to evaluate the retrievals}
#' \item{vis.R}{Code to visualize the retrievals}
#' \item{utils.R}{Functions that are useful in more than one place,
#' internally to the package}
#' \item{tools.R}{Functions that are also useful outside the package}
#' }
#'
#' @import dplyr
"_PACKAGE"