evaluateDroughtNemaTemepratureAdditional: Evaluates Drought Conditions (Additional Criteria) Relating...

In henningte/herdersWDA: Functions for Raster Based Weather Time Series Analysis

Description

evaluateDroughtNemaTemepratureAdditional evaluates based on air temeprature values for a target time period as raster based time series (RasterBrick or RasterStack object, if for a given spatial and temporal point drought or near drought conditions are prevalent or not (according to the classification of the NEMA). This function considers only additional criteria related to temerature. See evaluateDroughtNemaTemepratureMain for temperature related threshold values that represent main criteria.

Usage

evaluateDroughtNemaTemepratureAdditional(temperature, temperature_t, landcover)

Arguments

temperature	A RasterBrick or RasterStack object with (mean) temperature values on a daily basis within the target time period.
temperature_t	A POSIXct vector containing the time information for all layers in airhumidity as returned by dailyMeans (each element denoting the respective day).
landcover	A RasterBrick object containing the following layers in the following sequence "alpine" "steppe" "forest_steppe" "desert" "desert_steppe" "lakes" "taiga" Each raster layer has a value of 1 if the respective landcover class exists for a pixel and NA if not.

Value

A list with two elements:

droughttemperatureadditional

A RasterBrick object containing for each fixed ten-day interval in temperature_t a layer classifying if there were drought conditions according to the relative air humidity or not.

time

A character vector specifying the date of the first day of the respective fixed ten-day interval.

Examples

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henningte/herdersWDA documentation built on May 16, 2019, 3:11 p.m.