Trap-site fence line modelled in Carbon County, Wyoming

Capture

An eleven-minute window between 07:11 and 07:22 local, flown with a DJI Phantom 4 Pro (FC6310, 1-inch 20 MP RGB, 8.8 mm) on firmware v01.07.1641.

498 frames were captured as JPEG + DNG pairs; the 249 JPEGs went into processing and all 249 calibrated. The flight sat at 21.3 m above takeoff (21.1–21.5 m) with the camera pitched 70° down, an oblique grid flown in two passes at ISO 100. Image spacing in the processing log – 4.0 m along track, 3.1 m between lines, over a 31.2 × 20.8 m footprint – works out to roughly 81% forward and 90% side overlap.

Georeferencing came from the on-board geotags alone, WGS 84 / UTM zone 13N (EPSG:32613), with no ground control. The early start put the sun low, which shows as long shadows in the products; otherwise daylight VFR with low wind and good visibility.

Deliverables

The headline deliverable is a fly-through animation: MP4 at 1920 × 1080, 60 fps, 48 s, 902 MB.

The full product set was delivered alongside it: an orthomosaic GeoTIFF (4-band RGBA, 0.57 cm/px, 20,801 × 18,664 px, 363 MB), a float32 DSM at the same resolution, a simplified textured mesh in OBJ (378 MB) and PLY (220 MB), a densified point cloud in LAS and XYZ, and a 10-page Pix4D quality report at 0.57 cm GSD over 1.13 ha / 2.79 acres. The exported mosaic carries no embedded CRS tag, though the DSM and tiles carry EPSG:32613.

Cadence

One-off.

Method boundary

RGB photogrammetry georeferenced from the aircraft's geotags, with no ground control. The model is internally consistent and suitable for visualising the fence alignment, pen geometry and approach, relative measurements between features, and briefing crews. It is not suitable for fence-line staking, boundary work, engineering design, or any product that carries professional responsibility; that work is routed through a licensed Professional Land Surveyor.