# Coverage and data trust

> Understand what Agsemble measures, where provider data applies, how fresh it is, and what it must not be used to infer.

Human-readable version: https://agsemble.com/docs/coverage

## Fields and boundaries

Agsemble accepts GeoJSON Polygon and MultiPolygon boundaries worldwide in [longitude, latitude] order. The server validates topology and calculates area, perimeter, 25-hectare field-slot use, provenance, and durable boundary revisions.

- Maximum 5,000 vertices and 100 MultiPolygon components for saved fields
- Manual, imported, surveyed, driven, operational, and imagery-derived provenance can be recorded
- Every boundary is marked legal_status: not_cadastral
- Agsemble does not establish ownership, tenancy, title, or cadastral truth

## Weather

Weather is modeled at the field geometry’s mean coordinate, not sampled across the full polygon and not taken from an on-farm station. Coverage is global where Open-Meteo’s selected models return data; practical model resolution varies by location and model.

- Current temperature, humidity, wind, and day-one rainfall
- Seven-day minimum/maximum temperature, rainfall, precipitation probability, maximum wind, and FAO ET₀
- Sandbox responses cache for up to 24 hours; Founder responses for up to 6 hours
- source.provider, source.mode, source.retrieved_at, license, request_id, Age, and cache status remain explicit
- Open-Meteo free API use is prototype-only for Agsemble until commercial provider terms are confirmed; no production SLA is offered

## Earth observation

Earth observation uses Copernicus Sentinel-2 L2A through Sentinel Hub. NDVI is calculated from 10 m red and near-infrared bands over a 30-day lookback. Cloud, water, invalid, and no-data pixels are excluded from the NDVI statistic.

- The response includes mean, minimum, and maximum NDVI plus cloud cover and 10 m source resolution
- captured_at is the aggregation window end; observation_period exposes the complete interval
- Responses cache for up to seven days on Sandbox and Founder plans
- Sentinel-2 has a nominal multi-day revisit, but usable observations can be slower under persistent cloud
- Small or narrow fields can contain mixed 10 m pixels; NDVI is a signal, not a crop-health, pest, disease, yield, or fertilizer diagnosis

## Field observations

Scouting notes, pest, disease, irrigation, and harvest observations are startup-owned durable records. Mobile clients should save locally first and retry with the same obs_* ID and Idempotency-Key.

Foreground/manual sync is implemented in the Expo starter. Agsemble does not promise background execution after the operating system terminates the app.

## No-signup preview coverage

The public preview is intentionally narrower than the authenticated API: one Polygon in Southeast Asia (92–141°E, 12°S–29°N), at most 25 hectares and 200 vertices. It does not save history or expose provider, date, index, or lookback controls.

> **Commercial readiness:** Current live provider access is suitable for founder evaluation and prototype testing. Production resale rights, service levels, support obligations, and operator legal details remain explicit launch gates.