R/extdata.R

In igapfill: Interface for Gap-Filling Earth Observation Datasets

#' Time series images of Cerro de Garnica, Mexico  (2000-2024)
#' 
#' Spatial subsets of the MOD13Q1 v061 NDVI product, in \emph{.tif} format, covering Cerro
#' de Garnica National Park (https://simec.conanp.gob.mx/ficha.php?anp=66&reg=11) located at 
#' Michoacan, Mexico. These subsets were collected from February 16, 2000 to December 16, 2024. 
#' The spatial and temporal resolutions of these images are 250m and 16 days, respectively. 
#' 
#' Due to the amount and characteristics of these images, they are stored in two files
#' which we describe in what follows:
#'
#' @section garnica_250m_16_days_NDVI.tif:
#' 
#' This file contains 572 layers of Normalized Difference Vegetation Index 
#' (\href{https://en.wikipedia.org/wiki/Normalized_difference_vegetation_index}{NDVI}). 
#' By definition, NDVI = (NIR-RED)/(NIR+RED) where NIR and RED  are the Near Infrared 
#' and Red spectral bands, respectively. Although by definition, the NDVI is a value
#' belonging to the (-1, 1) interval, NASA distributes this product in integer (\code{INT2S})
#' data type; the scale parameter is 1e4.
#' 
#' More information about this \href{https://modis.gsfc.nasa.gov/about/}{MODIS}
#' product can be found \href{https://lpdaac.usgs.gov/products/mod13q1v061/}{here}.
#' 
#' @section garnica_250m_16_days_pixel_reliability.tif:
#' 
#' This file contains 572 pixel reliability layers. That is, in any of these layers,
#' the value of any pixel is either -1 (Fill/No data), 0 (Good quality), 1 (Marginal data), 
#' 2 (Snow/Ice) or 3 (Cloudy).
#' 
#' @name garnica
#' 
#' @note About the naming convention
#' 
#' Any layer in these files has the following naming convention:
#' 
#' MOD13Q1.AYYYYDDD.h08v07.061.YYYYDDDHHMMSS.250m_16_days_PRODUCT.tif
#' 
#' where:
#' \itemize{
#' \item MOD13Q1 is the product short name
#' \item AYYYYDDD is the Julian date of acquisition
#' \item h08v07 is the tile identifier
#' \item 061 is the product version
#' \item YYYYDDDHHMMSS is the Julian date of production
#' \item 250m is the spatial resolution
#' \item 16_days is the temporal resolution
#' \item PRODUCT is either NDVI or pixel_reliability
#' }
#' 
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