getWorldMap

<p>Make the rworldmap available for other functions. Since running cleangeo
    takes some time we want to run it once the first time it is called
    and make it available to other functions without overhead. The map
    is stored to the .RnightlightsEnv hidden package environment</p>

Extracts raster and zonal statistics
from satellite nightlight rasters downloaded from the United States
National Oceanic and Atmospheric Administration (<http://www.noaa.gov>)
free data repositories. Both the DMSP-OLS annual and SNPP-VIIRS monthly
nightlight raster data are supported. Satellite nightlight raster tiles are
downloaded and cropped to the country boundaries using shapefiles from the GADM
database of Global Administrative Areas (<http://gadm.org>). Zonal statistics
are then calculated at the lowest administrative boundary for the selected
country and cached locally for future retrieval. Finally, a simple data
explorer/browser is included that allows one to visualize the cached data e.g.
graphing, mapping and clustering regional data.

Christopher Njuguna

getWorldMap: Make the rworldmap available for other functions

Description

Usage

Arguments