Vineyard Aerial Scanning in the Willcox AVA: What You Actually See in the Data

This article was rewritten in October 2026. The original version described multispectral NDVI, a thermal overlay and per-scan pricing that did not match what we fly or what is on our rate card. What follows is the accurate version.

If you grow grapes in the Willcox AVA you already know the problem an aerial map is meant to solve: a block looks fine from the end of the row and is not fine forty vines in. The question is what a drone actually shows you, what it cannot, and whether it is worth $425 a visit. Here is the honest answer.

What we fly, and why we do not call it NDVI

NDVI is calculated from red and near-infrared reflectance. It needs a multispectral sensor. We fly a DJI Mavic 4 Pro with a 100 MP visible-light camera, which produces vigour indices derived from the red, green and blue channels. It is not NDVI, and we will not label it NDVI on a deliverable.

What a visible-light vigour index is good at is structure and contrast: canopy size and density row by row, gaps, missing or dead vines, weed pressure in the inter-row, sections where the canopy is visibly thinner or yellower than its neighbours, and the pattern of all of that across a block. At roughly 1 cm per pixel from a 70 m flight you can count vines. That resolution is the trade: satellite NDVI gives you a true red-edge index at 3 to 10 m per pixel; we give you a visible-light index at a few centimetres.

What it is weaker at is early stress before it is visible, and subtle differences in water or nitrogen status inside an otherwise healthy canopy. Multispectral catches some of that days earlier. We are not pretending otherwise. If your management problem is the early-warning kind, a multispectral service is the right tool and we will say so.

What growers actually see

Irrigation uniformity. This is the one that pays. Drip systems fail quietly: a plugged emitter line, a pressure drop at the end of a lateral, a valve that is not opening fully. On the ground you find it when the vines are already stressed. From the air a block with an irrigation problem has a shape: a strip, a wedge, a tail at the far end of the laterals. The map tells you where to walk.

Block-to-block vigour. The Willcox AVA sits between roughly 4,200 and 4,700 ft, and soils change across a single property. A vigour map shows you which blocks are running hot and which are lagging, which is the information behind differential harvest passes and next year's pruning and fertiliser decisions.

Gaps and replants. A count of missing vines per block, from the orthomosaic, in an afternoon.

Access and harvest logistics. Where the crew can get a bin trailer in, where the road has washed, which blocks are ripening together.

When to fly

The University of Arizona's Climate Viticulture Newsletter describes July, August and September as the months when most varieties ripen in most locations in most years, with harvest running into October and the back end of it overlapping the monsoon winding down. The scans that earn their money are a post-bud-break baseline, one or two in the June to July heat when irrigation problems show, and one pre-harvest pass. Monsoon afternoons are not flyable; mornings usually are.

What it costs

Those are the published numbers on the rate card, not a quote. The route day exists because three vineyards near Kansas Settlement can be flown in one morning and the drive is the expensive part.

What you receive

A georeferenced orthomosaic of the block, a vigour-index map from the same flight, an exported GeoTIFF you can load into whatever mapping software you use, and a one-page note of what we saw: the strips, the gaps, the sections that looked different from their neighbours. Delivery within three business days of the flight. The data is yours.

The short version

A visible-light aerial scan is the cheapest way to see irrigation problems and vigour patterns across a whole block at vine-level resolution, and it is not NDVI. If you need the early-warning capability of a near-infrared sensor, say so and we will point you to it. If you need to know where to walk tomorrow morning, this is $425. Our agriculture page has the full scope; the pre-harvest scouting post covers the September pass in detail. Tell us which block and when on the contact page.