Draw one field. Watch it grow, season by season.
Peak vegetation in 3D, every season from 2016 on, with the rainfall that year.
Shapefile, KML or GeoJSON. One field at a time, up to 1,500 acres.
A grower wants your read on this field
This map shows peak season NDVI for this field. Step through all 11 seasons, each marked for rainfall.
What is TerraZoner? Software for agronomists and crop consultants. It uses enhanced vegetation satellite data (EVI2) to build management zones field by field, then turns them into variable rate prescriptions and soil sampling points. It runs in a web browser, from C$1,500 a year (about US$1,100) with no per-acre charges.
What sets it apart? It uses the terrain as well as the crop. Satellite zoning often lumps wet and dry ground into the same low zone, so TerraZoner can split that zone into wetter and drier areas. Elevation loads on its own for any field. Performance Zones show how each area has performed over the years, and Landscape Response Zones line that up with high ground, low ground and slope to help explain why.
Crop growth across your field
2026 · One season’s satellite view
This map combines satellite images to show where vegetation was strongest and weakest within your field that season. Dark green means more vegetation; red means less.
The colours compare areas within this field, for this year. They don’t measure yield.
Recognise these patterns?
Choose another year above. Do the same areas keep showing up, or was something different that season?
How to read this map
Compare patterns, not colours across years. Each season is coloured separately. Green in one year doesn’t mean the same amount of vegetation as green in another. Even a fairly uniform field can show red and green.
Vegetation isn’t always crop. Weeds, trees and cattails can give strong readings. Roads, yards and ponds inside the boundary can give low readings. That’s why accurate field boundaries matter in precision ag: the boundary should follow the cultivated acres.
How the images are combined. The map uses up to five of the clearest satellite passes between June 15 and August 15, keeping each spot’s greenest NDVI reading. Readings cover patches about 10 metres across. Choosing the greenest helps reduce the effect of clouds and shadows.
The landscape behind the map. The background image stays the same when you change years. Heights are exaggerated to show the slopes. Terrain readings are about 30 metres apart, so small drains may not appear and trees can look like raised ground. Drag to rotate.
Rainfall marks. Blue means rainfall from May to mid-August was well above the area’s average; yellow means well below. No mark means near average. These are area estimates, using seasons from 2006 onward as the reference.
Turn field history into better-informed decisions
One season can show a reseeded patch or a missed fertilizer application. Years of imagery help reveal which differences persist.
TerraZoner helps your agronomist combine selected years into Performance Zones, then refine them with terrain, so a drowned-out low spot and a dry hilltop can be treated as different areas, even when both grow less.
An example of TerraZoner Performance Zones and their patterns across several seasons.
How TerraZoner builds Performance Zones
Choose the relevant years. Your agronomist selects the seasons to combine, taking account of crop history and known events such as reseeding or equipment problems.
Find the recurring patterns. TerraZoner combines those seasons. If one season is unusual in part of the field, its reading there is limited and flagged, so it can’t pull the zones off course.
Refine with terrain. Areas with similar vegetation readings can have different growing conditions. Terrain helps your agronomist separate those areas into distinct zones.
Performance Zones provide a basis for discussing differences within the field and how to manage them, whether or not you currently use variable rate.