Remote Sensing and NDVI — Seeing a Whole Block at Once, Season Over Season
- What remote sensing and NDVI make possible.
- Why whole-block, season-over-season monitoring is valuable.
- How this kind of monitoring complements on-the-ground inspection.
14.1 Information From Above
Some of the most useful information about crop health comes from above. Remote sensing — using satellite or drone imagery — allows an entire field to be assessed at once, and NDVI (introduced in Chapter 10) turns that imagery into a map of vegetation vigour across the whole block.
14.2 Scale and Consistency
The particular value of this approach is scale and consistency. Rather than sampling a handful of plants, a grower can see how vigour is distributed across an entire field, identify stronger and weaker zones, and — because satellite records build up over time — compare the same block season over season. That makes it possible to track whether a field is becoming healthier and more uniform, or drifting the other way, in a way that ground sampling alone cannot easily capture. Season-over-season NDVI analysis has been used to monitor perennial crops such as olives in exactly this way.
14.3 A Complement to Walking the Field
Remote sensing does not replace walking the field; it complements it. NDVI can flag where to look, and on-the-ground inspection then explains why — whether the cause is water distribution, a line problem, nutrition, or an oxygen limitation at the root zone. For growers with access to these tools, they offer a powerful, non-invasive way to monitor how any change in practice plays out at field scale.
Remote sensing and NDVI let growers assess whole-block vigour and track it season over season — a scale of insight ground sampling can't match. Used alongside field inspection, they help pinpoint where and why crop health varies.