myZonal

rast

nlType

character the type of raster being processed

configName

zone

a character list of statistics to calculate

nlStats

digits

Whether to return the raster data as a vector, or 
data.frame with spatial context NULL returns a vector of all
values, colrowval returns a data.frame with row, col and raster
value while lonlatval returns a data.frame with lon,lat and val.

retVal

na.rm

Other params to pass to the nlStats functions e.g. na.rm

Calculate zonal statistics. Used internally by zonalpipe. Modified from 
 <a href="http://www.guru-gis.net/efficient-zonal-statistics-using-r-and-gdal/">http://www.guru-gis.net/efficient-zonal-statistics-using-r-and-gdal/</a>

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

Rnightlights

Satellite Nightlight Data Extraction

myZonal function

Calculate zonal statistics. Used internally by zonalpipe. Modified from 
 <a href='http://www.guru-gis.net/efficient-zonal-statistics-using-r-and-gdal/'>http://www.guru-gis.net/efficient-zonal-statistics-using-r-and-gdal/</a>

myZonal: Calculate zonal statistics. Used internally

Description

Usage

Arguments

Value