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Table 2 Specifications of the used hardware

From: Emergent heritage: the digital conservation of archaeological sites in reservoirs and the case of the Dolmen de Guadalperal (Spain)

Device

Purpose

Specifications

Faro Focus 3D X330 (TLS)

Recording of point clouds

Range: 0.6–330 m

Ranging error (systematic measument error at around 10 m and 25 m):  ±  2 mm

Measurement rate (pts/sec): 9,76,000

DJI Phantom 4 Pro (UAV)

Aerial photogrammetry

GPS-GLONASS positioning system (±  0.5 m vertical accuracy,  ±  1.5 horizontal accuracy)

Effective: pixels: 20 million

Image sensor: one-inch CMOS sensor

Image size: 5472  ×  3648 pixels

File format: JPEG

Focal length (fixed): 8.8 mm

GoSCAN 50 (short-range scanner)

Recording of point clouds

Range (recommended): 0.05–0.5 m

Accuracy: 0.1 mm

Resolution: 0.1 mm

Measurement rate (pts/sec): 5,50,000

Scanning area: 143  ×  108 mm

Nikon D5300 (camera)

Close-range photogrammetry

Effective pixels: 24.2 million

Image sensor: 23.5  ×  15.6 CMOS sensor

Image size: 6000  ×  4000 pixels

File format: NEF, 14 bit compressed

Focal length (used): 18 mm