JJAS rainfall domain review jjas_chirps_domain_review_v1

CHIRPS v3.0 (0.05 deg monthly, 0.25 deg block mean) 1993–2025 · built 2026-10-10T23:38:21+00:00 · fingerprint 8186be2d0d14

Selected candidate: none yet. The review shows the evidence; a domain is exported only after an explicit selection.

1. Climatology

Ratio of climatological means from actual-calendar monthly totals (February 29 included); every year of the period required per cell.

JJAS mean rainfall
JJAS mean rainfall
Mean annual rainfall
Mean annual rainfall
JJAS share of annual rainfall
JJAS share of annual rainfall
Monthly cycle by EMI rainfall region
Monthly cycle by EMI rainfall region

Reference periods

PeriodStatusNote
1993-2025available
1981-2010unavailable12 of 30 years are not in the data (1981-1992); the period is not shortened.
1991-2020unavailable2 of 30 years are not in the data (1991-1992); the period is not shortened.
1996-2025available

Quality control

CheckResultDetail
CalendarpassedNot applicable: the cache holds the published monthly totals (calendar months, February 29 included as published); there is no daily cycle.
Unitsmmmm (monthly accumulation of daily mm amounts; no rate conversion)
Years1993–2025 (33)gaps: none
Completeness0 cellsCells touching Ethiopia whose CHIRPS record is not complete for every year and month.
Area1,129,938 km²3.6 km² beyond the grid; cell bounds intersected with the Ethiopia polygon, WGS84 geodesic areas
SourceCHIRPS v3.0 (0.05 deg monthly, 0.25 deg block mean)sha256 17a229d0813d23f4…
Nested candidatesyesraising either cutoff never adds a cell

2. References

Registered EMI climatology panels (climatologies printed in a 2026 publication; their averaging period is not documented). The comparison mode follows the evidence: drafts stay visual only.

ReferenceModeWhy not higherDigitizationOutline IoUControl / check RMSE (km)Document
emi_kiremt_map_2evisual_onlygeoreferencing and legend classes not revieweddraft0.9975.4 / 6.9b0282006170b
emi_kiremt_map_3evisual_onlygeoreferencing and legend classes not revieweddraft0.996.8 / 6.4b0282006170b
CHIRPS, EMI as published, and CHIRPS in the EMI classes
CHIRPS, EMI as published, and CHIRPS in the EMI classes
Registration and digitized classes: emi_kiremt_map_2e
Registration and digitized classes: emi_kiremt_map_2e
Registration and digitized classes: emi_kiremt_map_3e
Registration and digitized classes: emi_kiremt_map_3e

3. Candidate domains

Named comparisons side by side
Named comparisons side by side
All threshold candidates (one map each in candidates/)
All threshold candidates (one map each in candidates/)
Included share of Ethiopia by candidate
Included share of Ethiopia by candidate
Number of candidates including each cell
Number of candidates including each cell
Regional inclusion by candidate
Regional inclusion by candidate
Candidatemm% of annualIncluded km²% of EthiopiaUnknown km²Agreement with EMI-implied membershipBaseline changeFiles
mm100_share20≥ 100≥ 20778,54868.9496% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +3,279/−0 km²NetCDF · GeoJSON
mm100_share40≥ 100≥ 40672,97259.6496% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +5,552/−0 km²NetCDF · GeoJSON
mm100_share60≥ 100≥ 60383,03233.9494% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +3,029/−0 km²NetCDF · GeoJSON
mm100_share80≥ 100≥ 8095,2438.4496% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +2,248/−1,502 km²NetCDF · GeoJSON
mm200_share20≥ 200≥ 20697,15061.7493% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +2,282/−0 km²NetCDF · GeoJSON
mm200_share40≥ 200≥ 40619,34554.8493% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +4,565/−0 km²NetCDF · GeoJSON
mm200_share60≥ 200≥ 60382,77333.9494% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +3,029/−0 km²NetCDF · GeoJSON
mm200_share80≥ 200≥ 8095,2438.4496% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +2,248/−1,502 km²NetCDF · GeoJSON
mm400_share20≥ 400≥ 20570,92350.5493% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +2,294/−0 km²NetCDF · GeoJSON
mm400_share40≥ 400≥ 40542,46348.0492% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +2,292/−0 km²NetCDF · GeoJSON
mm400_share60≥ 400≥ 60379,77333.6495% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +2,280/−0 km²NetCDF · GeoJSON
mm400_share80≥ 400≥ 8095,2438.4496% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +2,248/−1,502 km²NetCDF · GeoJSON
mm600_share20≥ 600≥ 20470,10341.6494% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +0/−717 km²NetCDF · GeoJSON
mm600_share40≥ 600≥ 40462,45540.9494% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +764/−717 km²NetCDF · GeoJSON
mm600_share60≥ 600≥ 60357,33431.6496% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +1,519/−717 km²NetCDF · GeoJSON
mm600_share80≥ 600≥ 8091,3738.1497% (visual_only (draft preview))1981-2010: unavailable; 1991-2020: unavailable; 1996-2025: +748/−1,502 km²NetCDF · GeoJSON

Named comparisons

RuleIncluded km²% of EthiopiaAgreement with EMI-implied membershipFiles
Current JJAS R1+R2 rainfall domain: R1/R2 membership, JJAS >= 120 mm and >= 20% of annual623,76555.2Regime membership is not an amount/share threshold, so EMI classes imply no membership for it.NetCDF · GeoJSON
60% contribution rule: JJAS >= 60% of annual and >= 200 mm (no cleanup)382,77333.994% (visual_only (draft preview))NetCDF · GeoJSON
Wettest-season rule: JJAS wetter than FMAM and ONDJ, >= 100 mm (no cleanup)136,70212.1Wettest-season membership compares JJAS with FMAM and ONDJ; the EMI maps give no FMAM/ONDJ amounts.NetCDF · GeoJSON

Domain files: one NetCDF (membership codes: 1 included, 0 excluded, -1 insufficient data, -2 outside Ethiopia) and one GeoJSON outline (cells clipped to the border) per domain, in domains/. They are review candidates, not operational masks.

4. Assessment

Reference agreement

ReferenceModeExact classWithin one classCHIRPS wetter / drierOutside-interval median / p90Comparable / uncertain area
emi_kiremt_map_2evisual_only (draft preview)68%96%17% / 15%4.3 / 126.6 mm1,033,891 / 76,084 km²
emi_kiremt_map_3evisual_only (draft preview)76%98%12% / 12%0.0 / 4.7 pp1,067,462 / 44,901 km²

Agreement with EMI-implied membership counts only area where the EMI class lies entirely on one side of a cutoff (half a legend unit tolerance); straddling classes are undecided, never guessed.

Largest changes between neighbouring cutoffs

FromToChanged cutoffArea switching
mm100_share40mm100_share60annual share percent289,940 km²
mm100_share60mm100_share80annual share percent287,789 km²
mm200_share60mm200_share80annual share percent287,530 km²
mm400_share60mm400_share80annual share percent284,530 km²
mm600_share60mm600_share80annual share percent265,961 km²
mm200_share40mm200_share60annual share percent236,572 km²
mm400_share40mm400_share60annual share percent162,691 km²
mm200_share20mm400_share20seasonal rainfall mm126,227 km²
mm100_share20mm100_share40annual share percent105,576 km²
mm600_share40mm600_share60annual share percent105,120 km²
Baseline sensitivity
Baseline sensitivity

Dataset sensitivity: not assessed (CHIRPS only). Forecast skill is reported for a selected domain but never used to move its boundary.

Inputs

{
 "review_config": "35e78b91bbd9948098e5afa653382aab4e7b88ffb23ad4a1d04cf21316ceb559",
 "monthly_cache": "6f204093638aa6664abd5d4b12ad48d448c5af5edea71ce87b4592c60c037b17",
 "country_boundary": "96be2b2fc519922d12f4bb5165bad2ad518c2a3f9c8237a4481260d612b12b9f",
 "country_mask": "57ad8861c598abb9f175012920e5d0ef058e5b643cd6e4987cad3da6ac0b9e16",
 "reference_registry": "66d3098a0748af413afbd475edcbf173c2658cb808633380427bb9063bc38fb8",
 "regions_mask": "a6770d527fe05d756d2b158a8765a5b45e6694bc2e1944f4046a2a0d5d354658",
 "comparator:r12_regime_rule": "65b8d6bf9c3ac5ef408688ea9f79e028e421f7fdd371d093beb693db0fcfe802",
 "extraction:emi_kiremt_map_2e": "2564b2299b274d44cfc965527572374cd6807d5e2b2aa1f3c263bde505efd78a",
 "extraction:emi_kiremt_map_3e": "d05679113b128eedce340a0f08fbfdf115374076405e25425f075179d23fa666",
 "chirps_source_sha256": "17a229d0813d23f4c3a828717b1ca768d36afe0748f388fa5fd9d5a85e95ba50",
 "reference_documents": {
  "emi_kiremt_map_2e": [
   "b0282006170bf11d0cc137ec57e5b63e137e84348b26a595c71e722ed986d84c",
   "f747f7ef1c165782abb6a6d1c07b60f56d0e6f340ee2d930e1f259bdb898fa21"
  ],
  "emi_kiremt_map_3e": [
   "b0282006170bf11d0cc137ec57e5b63e137e84348b26a595c71e722ed986d84c",
   "cc15989fe473573e857d260bd3ace1ede1e6cb544fd4f52dadf8935a95a253f3"
  ]
 },
 "season_months": [
  6,
  7,
  8,
  9
 ],
 "application_period": [
  1993,
  2025
 ],
 "thresholds": {
  "seasonal_rainfall_mm": [
   100,
   200,
   400,
   600
  ],
  "annual_share_percent": [
   20,
   40,
   60,
   80
  ]
 },
 "method_version": "rainfall_domain_review_v1"
}