You can walk a golf course or an estate and swear it looks healthy. The trouble is what a walkover actually is: a small, subjective sample, taken once, along the paths you happened to take. A satellite reads the whole site the same way, on a schedule — and that's where the early warnings live.
The sampling problem
A walkover covers a fraction of a large greenspace, weighted toward where people go, at a single moment. Slow decline in a far corner, an out-of-play rough, or a rarely-visited bank is exactly what it misses — until the problem is obvious, and by then it's expensive to fix. Human inspection of a big site is unavoidably biased in coverage, timing and judgement.
Whole-site, objective, repeatable
Satellite imagery reads 100% of the footprint, every cell measured identically, every few days. No sampling bias, no "it looked fine on Tuesday." A vigour map covers every fairway, block, lawn or bank at once, so a declining zone shows up as a pattern in the data rather than an anecdote someone happens to notice.
Trend is the signal, not the snapshot
A single map is a moment; the value is the trajectory. A zone trending down across several reads — often before it browns visibly to the eye — is the early warning that lets you act on irrigation, drainage or wear while the fix is cheap. Because every report is measured the same way against the same baseline, you get a genuine like-for-like record over time: useful for a committee, a budget, or holding a contractor to a standard.
Where the line sits
The report describes condition and change, not cause, and it complements the greenkeeper's or estate manager's eye rather than replacing it. What it adds is coverage and objectivity: an early, whole-site, comparable read that catches the stressed patch before it becomes a dead one.
Catch problems while they're small and out of sight. That's what our greenspace reporting is built to do — tell us the site and how often you'd want a report.