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For agriculture, OHM WORKS designed Green Brother — a drone and satellite solution tailored for West African farms, cooperatives and engineering offices. Plant counting, NDVI vigor, crop stress, deliverables in under 72 h.
- XY accuracy under 3 cm, Z under 5 cm on every survey.
- Pilots certified by ANAC Benin and DGAC France.
- Actionable analysis maps delivered within 72 h.
Applications
Plant counting
Automated, georeferenced inventory across hundreds of hectares — cashew, mango, palm, maize, market garden crops. Compares actual plant populations to planned seeding densities, pinpoints gaps and plans replanting.
Crop vigor maps
NDVI, NDRE and GNDVI indices mapped at centimetric resolution. Precisely locates zones of water stress, nutritional deficiency and vigor loss to direct fertilizer applications only where needed.
Weed detection
Identifies and quantifies weed-infested areas in-season. Generates targeted weed management prescription maps and optimizes herbicide use — only where needed, only when needed.
Yield estimation
Determines the percentage and exact location of high and low yield-potential zones. Plan harvest operations, evaluate revenue before harvest day and decide on corrective actions mid-season.
Disease and pest detection
Analyses crops at different growth stages to detect fungal diseases and pest damage early. Identifies priority treatment zones to intervene before losses spread across the whole parcel.
Plant stress and waterlogging
Rapidly and precisely locates all zones affected by water stress or waterlogging, regardless of field size or crop type. Reduces negative crop impacts and helps plan irrigation or drainage interventions.
Our method
A proven three-step protocol, from technical brief to delivery of usable data.
- 01Step 1
Brief & sensor setup
Scoping: area, crop species, target indices, growth stage and objective (initial, yield or health report). Sensor selection (RGB, 5-band multispectral, thermal) and mission planning.
- 02Step 2
Certified multispectral flight
ANAC / DGAC-certified drone, GSD 2-5 cm/pixel depending on agronomic objective. A 100 ha parcel captured in under 2 hours, with systematic radiometric calibration.
- 03Step 3
Maps & deliverable report
Vegetation index computation, parcel classification, prescription map generation and structured agronomic report (initial, yield or health) — compatible with farming GIS tools and variable-rate sprayers.
Monitoring programme
Track your crops at every growth stage
Three reports calibrated to vegetative and reproductive stages — from germination to harvest — to steer each campaign with precision.
Initial Report
- Germination rate
- Plant count
- % and weed zones
- Elevation map
- Waterlogging mapping
- Actual arable area
- Field boundary delineation
- GeoTIFF export
Yield Report
- Plant vigor
- % and weed zones
- NDVI map
- GeoTIFF export
Health Report
- Plant vigor
- NDVI maps
- Damage detection
- GeoTIFF export
Deliverables
Ready-to-use data, delivered in the formats expected by your field and design teams.
Vegetation index maps
GeoTIFFPNGNDVI, NDRE, GNDVI — stress diagnosis, deficiency zones, multi-year vigor tracking
Plant count and population report
PDFCSVKMLGeoreferenced inventory, seeding gap detection, replanting planning
High-resolution multispectral orthophoto
GeoTIFFECWParcel overview, agronomic zoning, campaign archive and inter-season comparison
Variable-rate prescription maps
SHPISO XMLModulated treatment compatible with variable-rate sprayers and farming GIS tools
Structured agronomic report
PDFInitial (germination), yield or health report depending on vegetative or reproductive growth stage