Surface Water Variability SWV

Twelve-month sample series

A representative parcel under EC-M-1.1, July 2025 through June 2026. The line is the published value at each monthly vintage; the band is the 95% confidence interval. Past vintages are immutable — this same chart, queried in 2040, returns the same values.

Sample observation

A complete response object for this signal at a sample location and as-of date. Every field below appears on every observation; signal-specific structure lives under components.

{
  "signal_id": "surface-water-variability",
  "version": "0.4.0",
  "methodology_version": "EC-M-1.1",
  "as_of": "2026-04-30",
  "vintage_pinned": true,
  "value": 0.18,
  "baseline_years": 20,
  "regime": "stable",
  "lineage": {
    "inputs_count": 4,
    "computation_graph": "https://api.earth-signals.com/v1/signals/surface-water-variability/lineage/0xa3f2..."
  }
}

How to query

The signal is queried at the canonical /v1/signals/{id} endpoint. Required parameters are a location and an as-of date. The same query replayed in 2040 returns the same value.

curl https://api.earth-signals.com/v1/signals/surface-water-variability \
  -H "Authorization: Bearer es_preview_..." \
  -d "lat=44.4654" \
  -d "lng=-72.6874" \
  -d "as_of=2026-04-30"

Endpoint and tokens shown for spec illustration. The Earth Signals API is in private beta with named design partners; the underlying Earth API and Calculator API are live.

The full parameter table — point query, parcel id, polygon aggregation, methodology pinning — is in the API reference.

Audiences that lean on this signal

Citation

Cite the catalog id, the signal version, the methodology version, and the as-of date. Together these define a reproducible observation forever — independent of methodology revisions.