Glossary
As-Applied Map
The record of where product actually landed on a pass — built from the aircraft’s own logged flight track and rate data, as opposed to the prescription map that described where it was supposed to go.
Definition
A prescription map is a plan; an as-applied map is the receipt. During a spreading or seeding pass the aircraft logs its position and its working state continuously, and that log is turned into a map showing the ground the swath actually covered, where the passes overlapped, where anything was skipped, and what rate was being delivered across the field. The two maps are meant to be read together: laying the as-applied over the prescription is how you confirm the zones that were supposed to get a heavier rate actually did, and how a headland that got missed while turning becomes visible instead of being discovered at harvest. Because the record comes from the aircraft rather than from a person writing down what they think happened, it is a factual account of the pass — including the parts that did not go to plan.
In an Alberta Context
On an Alberta farm the as-applied map does three jobs. It closes the loop on variable-rate work, so a prescription built from zone soil tests can be checked rather than assumed. It documents the pass for programs and paperwork — cover-crop practice records under OFCAF, for instance, benefit from a dated record showing the acres that were actually seeded rather than the acres that were intended. And it becomes an input to next season, because the coverage from this year sits alongside yield and imagery when management zones are redrawn. UAV AG returns an as-applied coverage record on granular spreading passes, which is the everyday legal drone service in Canada today.
Why It Matters
Without an as-applied record the only evidence a pass happened correctly is memory. That is thin ground when a field shows a pale strip in July, when a program asks for proof of the practice it funded, or when a grower is deciding whether a variable-rate prescription was worth the setup effort. The map turns an application from something that was done into something that can be checked, defended, and improved on — which is a large part of why a documented pass is worth more than a cheaper undocumented one.
Frequently Asked Questions
+What is the difference between a prescription map and an as-applied map?
A prescription map is written before the pass and says what rate each zone should receive. An as-applied map is produced by the pass itself and shows what the aircraft actually covered and delivered. One is the plan, the other is the record, and overlaying them is how you check that the plan was carried out.
+What does an as-applied map actually show?
The ground the swath covered, where passes overlapped, where anything was skipped — headlands and turn areas are the usual culprits — and the rate being delivered across the field. It is built from the aircraft’s own logged position and working state, not from notes written after the fact.
+Can an as-applied map be used for program documentation?
It is well suited to it. A dated map showing the acres actually treated is stronger evidence of a practice than an invoice alone, which matters for cost-share programs such as OFCAF where a cover-crop pass has to be documented. Confirm the specific evidence a program wants, since requirements are set by the program, not by the equipment.
+Do I get an as-applied map on a flat-rate pass?
Yes. Variable rate is where the map is most obviously useful, but a flat-rate pass still produces a coverage record showing the acres flown, the overlap, and any skips. On a uniform field where a flat rate is the correct call, that coverage record is the main documentation value.