Application domain
Agriculture
Two zones of the same field are not worth the same. The point is knowing which ones, and why.
The questions
What the field does not tell you.
Yield has always varied from one end of the field to the other. The question is not observing it — it is knowing its physical cause.
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Why does this zone underperform every year?
Shallow soil, plough pan, a clay pocket, waterlogging. Resistivity mapping separates these cases, which satellite imagery conflates.
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Where should inputs be varied?
Zoning based on soil — not on one season's vigour — stays valid for years. It is the base layer of any variable-rate strategy.
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Where do the drains run?
The plans are lost, the drains are not. Radar and resistivity find them without opening a trench.
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What is the real available water capacity?
Usable depth and texture govern water holding. Resistivity approaches both directly, and continuously.
Explorer
Agricultural soil, layer by layer.
Drag the marker down. In agriculture everything happens in the first two metres — but every decimetre counts.
- Cultivated horizon 0 – 0.3 m ARP®
- Plough pan 0.25 – 0.5 m ARP®
- Available water capacity 0 – 1 m ARP®
- Field drains 0.6 – 1.3 m GPR
- Soil depth and bedrock 0.5 – 2 m ARP®
Three depths
One pass. Three maps.
ARP® does not measure one depth but three at once. Switch channel and the map transforms in front of you. The deeper you go, the broader the structures — the volume of soil integrated grows with depth.
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Channel V1: a real export from a parcel mapped by GEOCARTA. Channels V2 and V3: simulated from V1 pending the real exports — a deeper channel integrates a larger volume of soil, hence broader structures.
Investigation strategy
The methods deployed.
Agriculture demands area covered at the right cost. Towed resistivity is unbeatable here; radar comes in as a targeted complement.
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ARP®
Electrical resistivity
The backbone. Three depths measured at once at working speed, across tens of hectares a day.
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GPR
Ground-penetrating radar
Precise location of drains and interfaces, on the zones where resistivity flags an anomaly.
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EMP
Electromagnetics
A useful complement on saline or highly conductive soils, where resistivity alone saturates.
Projects
A parcel, read in depth.
This is what a delivered survey looks like: an entire parcel mapped continuously, across three investigation depths, georeferenced to the centimetre.
What the map shows.
The contrast is sharp: a broad conductive zone to the west, a resistive zone to the east, separated by a clean transition. That kind of opposition usually reflects a change in texture or soil depth — two parameters that bear directly on water reserve and on how the parcel behaves in a dry year.
A real map. The definitive agronomic interpretation is established with the farmer, against their yield history and field observations.
Reading a resistivity map
- Blue Conductive Clay, deep soil, water retention. Often the slowest zones to warm in spring.
- Green Intermediate Balanced texture and depth. Usually the reference state of the parcel.
- Red Resistive Sand, stones, shallow soil. Low available water, sensitive to drought stress.
What you receive
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Resistivity maps
One map per investigation depth, georeferenced and ready to overlay on your existing layers.
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Agronomic zoning
The parcel divided into homogeneous management units, usable for variable-rate application.
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GIS exports
Shapefile, rasters and DWG — compatible with ArcGIS, QGIS and your precision-farming consoles.
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GCAgri access
View, compare and analyse your parcels online, with no software to install.
Map your fields?
Farmers, cooperatives, agronomic advisers: let's talk area, objective and timing.