Calculate Standardised Drought Indices Using NASA POWER Data R package PowerSDI version 1.0.0 CRAN Task View: Hydrology (https://CRAN.R-project.org/view=Hydrology) 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). Software Depends: R (>= 3.1.0) Imports: graphics, lmom, lubridate, nasapower, stats Suggests: knitr, rmarkdown, testthat (>= 3.0.0), vcr (>= 0.6.0), vdiffr (>= 1.0.0) Gabriel Constantino Blain <gabriel.blain@sp.gov.br> Comprehensive R Archive Network (CRAN) Gabriel Constantino Blain [aut, cre] (ORCID: <https://orcid.org/0000-0001-8832-7734>), Graciela R. Sobierajski [aut] (ORCID: <https://orcid.org/0000-0002-7211-9268>), Leticia L. Martins [aut] (ORCID: <https://orcid.org/0000-0002-0299-3005>), Adam H. Sparks [aut] (ORCID: <https://orcid.org/0000-0002-0061-8359>) MIT + file LICENSE (https://CRAN.R-project.org/package=PowerSDI/LICENSE) 2024-01-15 application/tgz https://CRAN.R-project.org/package=PowerSDI doi:10.32614/CRAN.package.PowerSDI en-GB