Aerial Survey Coverage Calculator

Drone photogrammetry surveys require systematic overlapping image capture so photogrammetry software can stitch a 3D model or orthomosaic from the photos. This calculator works from your camera's ground-sample geometry: at a given altitude, sensor size, and focal length, each image covers a rectangular ground footprint, and consecutive images must overlap that footprint by a specified percentage along the flight path (front overlap) and between adjacent flight lines (side overlap). Total image count responds most to front and side overlap, because pushing overlap higher shrinks the effective advance between captures in both directions -- at 95% overlap you advance only 5% of the footprint per shot, multiplying required images compared to 50% overlap. Drone speed has no effect on total image count or total flight distance at all: those are purely geometric quantities set by area size, overlap, and camera optics, independent of how fast you fly. Speed only determines how long the mission takes (flight time) and how often the camera must fire (photo interval) to hit the required advance distance -- fly faster and you need a shorter interval between shots to maintain the same overlap, which is the key check against your camera's actual burst-capture capability -- at very high drone speeds, speed itself can move photo interval more than front overlap does, since interval is advance distance divided directly by speed.

Side overlap and area width together determine the number of flight lines needed: side overlap sets the cross-track spacing between lines, while area width sets how many of those spacings fit across the survey -- for a wide enough survey area, area width can move the line count more than side overlap does. Area length has no bearing on how many lines you need, only on how long each one is. Total flight distance approximates each line-to-line turnaround as equal to the side advance distance -- a simplification that omits the real deceleration, banked-turn radius, and re-acceleration a drone needs to reverse course and line up on the next flight line, so estimated flight time tends to run a bit optimistic versus an actual mission, especially for surveys with many short flight lines where turnarounds are a larger share of total flight time. This model assumes flat terrain and a constant altitude above ground level -- it does not account for terrain-following adjustments, wind drift, or GPS-triggered versus time-triggered capture differences, all of which affect real-world image counts.