Publication Date:
2024-04-20
Description:
This data consists of a set of images recorded during aerial drone surveys on 2017/09/07 and 2018/09/25 using a 3DR IRIS drone (unpiloted quadcopter), equipped with a Ricoh GR4 camera (16.2 sensor, 28mm focal length, maximum aperture f2.8, shutter speed faster than 1/1000th sec). For each survey, two flights were undertaken: nadir imagery from 60 m above ground level (agl) and oblique (ca. 20° from nadir) images from 55 m agl, providing mean ground sampling distances ca. 16 mm. Also contained are the outputs of Structure from Motion photogrammetry (SfM) processing, which includes point clouds and derived raster products such as Digital Surface Models, Terrain Models, Canopy Heights Models, and Digital Elevation models of difference. SfM photogrammetric processing was carried out using Agisoft Metashape (v1.5) and constrained using 40 fixed ground control points, the locations and spatially accuracies of which are also provided here. Surveys were undertaken at Clyst William Cross County Wildlife site, England which has an area of 10 ha and is located on the River Tale, a 4th order stream (lat: 50.820, long: -3.313). These data were recorded to evaluate changes in the canopy height within a complex willow (Salix sp.) dominant riparian woodland, following the reintroduction of beaver (Castor fiber) in 2016. Further, these data were used to test a range of error propagation methods for elevation change detection, using drone-based SfM photogrammetry, and consider their application in vegetated systems. The code required to reproduce the derived SfM prducts can be found here: https://doi.org/10.5281/zenodo.5500199 and https://doi.org/10.5281/zenodo.5500203.
Keywords:
beaver; Binary Object; Binary Object (File Size); Binary Object (MD5 Hash); Binary Object (Media Type); Canopy change; Drone; ecosystem engineers; structure-from-motion photogrammetry; Vegetation change
Type:
Dataset
Format:
text/tab-separated-values, 3311 data points
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