refPM

Contains data for calculating the <acronym>SPI</acronym> and <acronym>SPEI</acronym>.

datasets

A set of functions designed to calculate the standardised
precipitation and standardised precipitation evapotranspiration indices
using NASA POWER data as described in Blain et al. (2023)
<doi:10.2139/ssrn.4442843>. These indices are calculated using a reference
data source. The functions verify if the indices' estimates meet the
assumption of normality and how well NASA POWER estimates represent
real-world data. Indices are calculated in a routine mode. Potential
evapotranspiration amounts and the difference between rainfall and potential
evapotranspiration are also calculated. The functions adopt a basic time
scale that splits each month into four periods. Days 1 to 7, days 8 to 14,
days 15 to 21, and days 22 to 28, 29, 30, or 31, where 'TS=4' corresponds to
a 1-month length moving window (calculated 4 times per month) and 'TS=48'
corresponds to a 12-month length moving window (calculated 4 times per
month).

Gabriel Constantino Blain

PowerSDI

Calculate Standardised Drought Indices Using NASA POWER Data

Graciela R. Sobierajski

Leticia L. Martins

Adam H. Sparks

refPM function

A <code>data.frame</code> with 10958 rows and 11 variables.
<dl>
<dt>YEAR</dt>
<dd>Year</dd><dt>MM</dt>
<dd>Month</dd><dt>DD</dt>
<dd>Day</dd><dt>tavg</dt>
<dd>Daily average air temperature at 2 metres above the ground
 (degrees C)</dd><dt>tmax</dt>
<dd>Daily maximum air temperature at 2 metres above the ground
 (degrees C)</dd><dt>tmin</dt>
<dd>Daily minimum air temperature at 2 metres above the ground
 (degrees C)</dd><dt>Ra</dt>
<dd>Daily top of the atmosphere radiation (MJ/m^2/day)</dd><dt>Rs</dt>
<dd>Daily global horizontal irradiance (MJ/m^2/day)</dd><dt>W</dt>
<dd>Daily average wind speed at 2 metres above the ground (m/s)</dd><dt>RH</dt>
<dd>Daily average relative humidity at 2 metres above the ground
 (in percentage)</dd><dt>Rain</dt>
<dd>Daily rainfall amounts (mm)</dd>
</dl>

Format

Example of the Input Required by the Reference Function — refPM

A <code>data.frame</code> with 10958 rows and 11 variables.
<dl>
<dt>YEAR</dt>
<dd>Year</dd>

<dt>MM</dt>
<dd>Month</dd>

<dt>DD</dt>
<dd>Day</dd>

<dt>tavg</dt>
<dd>Daily average air temperature at 2 metres above the ground
 (degrees C)</dd>

<dt>tmax</dt>
<dd>Daily maximum air temperature at 2 metres above the ground
 (degrees C)</dd>

<dt>tmin</dt>
<dd>Daily minimum air temperature at 2 metres above the ground
 (degrees C)</dd>

<dt>Ra</dt>
<dd>Daily top of the atmosphere radiation (MJ/m^2/day)</dd>

<dt>Rs</dt>
<dd>Daily global horizontal irradiance (MJ/m^2/day)</dd>

<dt>W</dt>
<dd>Daily average wind speed at 2 metres above the ground (m/s)</dd>

<dt>RH</dt>
<dd>Daily average relative humidity at 2 metres above the ground
 (in percentage)</dd>

<dt>Rain</dt>
<dd>Daily rainfall amounts (mm)</dd>


</dl>

refPM: Example of the Input Required by the Reference Function

Description

Usage

Arguments

Format

Examples