getTilesCtryIntersectVIIRS

ctryCode

<p>Create a dataframe mapping each country in the rworldmap to the VIIRS
    tiles which they intersect with and thus need to be retrieved to
    process their nightlight imagery. Since some functions use this
    dataframe for long-term processing, omitCountries can eliminate 
    countries that should be excluded from the list hence from processing.
    Countries can be added in the omitCountries function.
    Default is "none".</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

getTilesCtryIntersectVIIRS: Get a list of tiles that a country polygon intersects with

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