#' Standard deviation of soil total nitrogen content in a south area (33 x 33km) of lake Alaotra in Madagascar.
#'
#' A dataset containing the standard deviation of soil TN content from 0-30 cm layer.
#'
#' @docType data
#'
#' @format a RasterLayer with dimensions : 134, 135, 18090 (nrow, ncol, ncell),
#' resolution : 250, 250 (x, y).
#'
#' @usage data(TN_sd)
#'
#' @source ISRIC soilgrid information. HENGL, T., MENDES DE JESUS,
#' J., HEUVELINK, G. B. M., RUIPEREZ GONZALEZ, M., KILIBARDA, M.,
#' BLAGOTIC, A., SHANGGUAN, W., WRIGHT, M. N., GENG, X., BAUER-MARSCHALLINGER, B.,
#' GUEVARA, M. A., VARGAS, R., MACMILLAN, R. A., BATJES, N. H., LEENAARS, J. G. B.,
#' RIBEIRO, E., WHEELER, I., MANTEL, S. & KEMPEN, B. 2017. SoilGrids250m:
#' Global gridded soil information based on machine learning. PLOS ONE, 12, e0169748.
#'
#' @name TN_sd
NULL
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