YEZA
Building terrain
Rwanda-born agricultural intelligence · Est. 2024

Intelligence for every acre.

YEZA is building geospatial AI that reads satellite, terrain, soil and weather data plot by plot — and turns it into clear guidance a farmer can act on.

See how it works
Scroll to fly
01 — Observe

Every field, measured from orbit.

Earth-observation satellites pass over Rwanda's hills every few days, recording light the eye cannot see. Healthy leaves reflect strongly in near-infrared; stressed or sparse crops do not. Repeated across a season, that signal becomes the raw material for every insight.

  • OpticalSentinel-2 and Landsat multispectral imagery — crop development, land cover and change through the season.
  • RadarSentinel-1 synthetic aperture radar — observations that continue through rainy-season cloud.
  • TerrainElevation models — slope, aspect and drainage pathways across hillside farms.
10 m pixels~5-day revisitCloud-maskedDay & night radar
02 — Map

Each farm becomes a place.

Pixels mean little until they belong to a real plot. YEZA anchors everything to a verified field boundary — with its crop, variety and planting date — so each satellite pixel, rainfall reading and soil sample is linked to a specific farm and a specific moment in its season.

Because the data model is field-centred, YEZA can compare zones within one field, fields within a cooperative, and patterns across districts.

Farmers and field agents can correct boundaries, crops and dates. The map learns from the people who know the land.

03 — Interpret

Pixels become indicators.

Raw reflectance is converted into layers an agronomist can reason with. Switch layers to see the same hillside four ways.

04 — Detect

A change worth checking.

A single image is a snapshot. YEZA follows each plot through the season and compares it with its own trend and with nearby fields of the same crop and planting date. When part of a field falls behind, that zone is flagged — with the evidence and an honest confidence level.

NDVI through the season — plot 0412
Flagged zone vs. 14 nearby maize plots planted within 7 days
Flagged zone (mean)Nearby plots (median)
View as table

Illustrative values. Gaps are cloud-masked observations — dropped, never guessed.

05 — Act

From a pixel to a farmer's phone.

A farmer doesn't need the map. They need a clear next step. Every YEZA alert is built to answer five questions:

  1. What was observed?
  2. Where in the field?
  3. Why does it matter now?
  4. What can the farmer do?
  5. How certain is the system?
Android app, offline-first
WhatsApp, with photos
SMS for basic phones
Voice in Kinyarwanda
09:41●●● 4G
YEZAMuraho, Uwase
Plot 0412 · Maize
Day 81 · tasselling stage
Check needed
Inspect here 0 — 20 m
Part of your maize plot is greening more slowly than its recent trend. This does not confirm a disease. Please inspect the marked area for water stress, nutrient symptoms or pest damage.
SEEN BY SENTINEL-2 · 12 NOV 2026
CONFIDENCE: MEDIUM
Same alert · SMS

YEZA: Maize plot 0412 — one area is behind its recent growth trend. Not a confirmed disease. Please check the marked area. Reply 1 for a call from your extension officer.

06 — Learn

Ground truth makes the model local.

A model that works in one district, crop or season can fail in the next. Every field inspection, geotagged photo and measured harvest is linked back to its plot — with the farmer's consent — so YEZA is calibrated and validated in the places where it advises.

01
Ingest
Sentinel-1/2, Landsat, weather, soil, terrain, farm GPS, field photos.
02
Spatial foundation
PostGIS field registry, raster catalogue, STAC metadata, data lineage.
03
GeoAI features
Cloud masking, indices, terrain derivatives, zonal time series.
04
Models
Crop mapping, anomaly detection, risk and yield estimation.
05
Decision
Confidence-aware alerts, agronomist review, dashboards, APIs.
Farmer photographing a maize leaf with a smartphone
Phone visionLeaf photos are screened for likely symptom patterns — a prompt to inspect, never a definitive diagnosis.
Field agent collecting a soil and plant sample
Field checksAgents confirm or reject alerts on the ground, building a governed, labelled dataset.
Extension officer reviewing a satellite map with farmers on a tablet
Human reviewUncertain or high-impact cases are routed to trained agronomists and extension officers.
Data YEZA is designed to combine
Sentinel-2 MSIOptical, 10–60 m, multispectral
Sentinel-1 SARRadar, all-weather, day and night
Landsat 8/930 m optical, long historical baseline
Digital elevation modelsSlope, aspect, flow and wetness
RwaSISRwanda Soil Information System
NISR Seasonal Agricultural SurveyCrop area, yield and practice context
Rwanda Meteorology AgencyAgro-meteorological forecasts
Farmer records & photosPlot-level ground truth, with consent

Each source is integrated only after its access terms, licence, resolution and update frequency are confirmed. National statistics give context; they never replace plot-level observation.

How YEZA earns trust
  • Evidence beside every insight. Observation date, data source and confidence are always shown.
  • Abstains when evidence is weak. No alert is better than a false one.
  • Validated where it advises. Performance is reported by crop, district and season.
  • Farmer data stays the farmer's. Informed consent, minimal collection, role-based access.
Next

One crop. One district.
Real fields first.

YEZA is preparing a tightly scoped pilot: field mapping, satellite crop monitoring and alert workflows — checked on the ground before anything is scaled.

CooperativesMember-farm monitoring, alert triage and production outlook.
Commercial farmsField-level monitoring and precision input planning.
Agencies & NGOsRegional crop monitoring and early warning.
Research partnersEarth observation and spatial ML for Rwandan agriculture.