About the data.

Data: CHIRPS and IMERG

Reference:

1. CHIRPS https://chc.ucsb.edu/data/chirps

2. IMERG https://gpm.nasa.gov/data/imerg

Source:

1. CHIRPS https://data.chc.ucsb.edu/products/CHIRPS-2.0/global_daily/

2. IMERG https://gpm1.gesdisc.eosdis.nasa.gov/data/GPM_L3/GPM_3IMERGDF.06/

Spatial resolution:

1. CHIRPS: 0.05 deg ~ 5.6 km at equator.

2. IMERG: 0.1 deg ~ 11.1 km at equator

Temporal resolution:

1. CHIRPS: 1 Jan 1981 - 31 May 2020, daily

2. IMERG: 1 Jun 2000 - 7 Apr 2021, daily

Coverage:

1. CHIRPS: 50N-50S, 180W-180E

2. IMERG: 90N-90S, 180W-180E

Method:

• The longest period of consecutive days with at least 1 mm precipitation. 1mm is common threshold of precipitation total for each day which can be categorised as rainy day and use widely by meteorological bureau..

• Let RRij be the daily precipitation amount per day i during time period j. Count the largest number of consecutive days where: RRij ≥1 mm

Script:

Code to calculate CWD available at: https://gist.github.com/bennyistanto/71814a5244f65e6d60ae30cc608de943

Unit:

Number of days.

Format:

GeoTIFF (*.tif)

Projection:

EPSG:4326

Download.

CWD, rainy day ≥1mm.

CHIRPS: https://on.istan.to/2P42w8h

IMERG: https://on.istan.to/337Ttvz

CWD, rainy day ≥10mm.

CHIRPS: https://on.istan.to/2P4hIm1

IMERG: https://on.istan.to/2EuLHBH

CWD, rainy day ≥2.5mm.

CHIRPS: https://on.istan.to/30468xl

IMERG: https://on.istan.to/3g7R0Vl

CWD, rainy day ≥20mm.

CHIRPS: https://on.istan.to/2CTRQXw

IMERG: https://on.istan.to/3070NFE

CWD, rainy day ≥5mm.

CHIRPS: https://on.istan.to/2Dhat7p

IMERG: https://on.istan.to/2P4LZku