person("Trevor L", "Davis", role=c("aut", "cre"), email="trevor.l.davis@gmail.com",

Package: gridsample
Title: Tools for Grid-Based Survey Sampling Design
Version: 0.1.2
Author: Dana R. Thomson (University of Southampton), Nick W. Ruktanonchai
(University of Southampton), Forrest R. Stevens (University of Louisville),
Marcia Castro (Harvard University), Andrew J. Tatem (University of Southampton)
Maintainer: Nick Ruktanonchai <nrukt00@gmail.com>
Description: Multi-stage cluster household surveys are commonly performed by
governments and programs to monitor population demographic, social,
economic, and health outcomes. In these surveys, communities are sampled
in a first  stage of sampling from within subpopulations of interest
(or strata), households are sampled in a second stage of sampling, and
sometimes individuals are listed and further sampled within households.
The first stage of sampling, where communities of sample populations are
defined, are called Primary Sampling Units (PSUs) while the households
are secondary sampling units (SSUs). Census data are typically used to
select PSUs within strata. If census data are outdated, inaccurate, or
not available at fine enough scale, however, gridded population data can
be used instead. This tool selects PSUs within user-defined strata using
gridded population data, given desired numbers of sampled households
within each PSU. The population densities used to create PSUs are drawn
from rasters such as the population data from the WorldPop Project
(http://www.worldpop.org.uk). PSUs are defined within a stratum using a
serpentine sampling method, and can be set to have a certain ratio of
urban and rural PSUs, or to be evenly distributed across a coarse,
user-defined grid.
Depends: R (>= 3.2.3)
License: GPL-2
Encoding: UTF-8
LazyData: true
Imports: rgdal, raster, data.table, rgeos, geosphere, sp, deldir,
spatstat, methods, maptools
RoxygenNote: 5.0.1.9000
Suggests: knitr, rmarkdown
NeedsCompilation: no
Packaged: 2016-11-23 23:57:59 UTC; Nick
Repository: CRAN
Date/Publication: 2016-11-24 11:31:10