Effects of point cloud density, interpolation method and grid size on derived Digital Terrain Model accuracy at micro topography level
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Agüera Vega, Francisco; Agüera-Puntas, Marta; Martínez Carricondo, Patricio Jesús; Mancini, Francesco; Carvajal Ramírez, FernandoFecha
2020Resumen
The objective of this study was to evaluate the effects of the three
dimensional (3D) point cloud density derived from Unmanned
Aerial Vehicle (UAV) photogrammetry (using Structure from
Motion (SfM) and Multi-View Stereopsis (MVS) techniques), the
interpolation method for generating a digital terrain model (DTM),
and the resolution (grid size (GS)) of the derived DTM on the
accuracy of estimated heights in small areas, where a very accurate
high spatial resolution is required. A UAV-photogrammetry project
was carried out on 13 m × 13 m bare soil with a rotatory wing UAV at
10 m flight altitude (equivalent ground sample distance = 0.4 cm),
and the 3D point cloud was derived. A stratified random sample
(200 points in each square metre) was extracted and from the rest of
the cloud, 15 stratified random samples representing 1, 2, 3, 4, 5, 10,
15, 20, 30, 40, 50, 60, 70, 80, and 90% were extracted. Five replications
of each percentage were extracted to analyse the effect of
c...
Palabra/s clave
Unmanned Aerial Vehicle (UAV)
Structure from Motion (SfM)
Multi-View Stereopsis (MVS) techniques
Digital Terrain Model
micro topography level