气候变化领域集成服务门户(CCPortal): 3D models created from ROV videos and their corresponding subtransect dimensions

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.803844
	3D models created from ROV videos and their corresponding subtransect dimensions
	Fillinger; Laura; Funke; Tobias
发布日期	2013-12-11
数据集类型	dataset
英文简介	Underwater video transects have become a common tool for quantitative analysis of the seafloor. However a major difficulty remains in the accurate determination of the area surveyed as underwater navigation can be unreliable and image scaling does not always compensate for distortions due to perspective and topography. Depending on the camera set-up and available instruments, different methods of surface measurement are applied, which make it difficult to compare data obtained by different vehicles. 3-D modelling of the seafloor based on 2-D video data and a reference scale can be used to compute subtransect dimensions. Focussing on the length of the subtransect, the data obtained from 3-D models created with the software PhotoModeler Scanner are compared with those determined from underwater acoustic positioning (ultra short baseline, USBL) and bottom tracking (Doppler velocity log, DVL). 3-D model building and scaling was successfully conducted on all three tested set-ups and the distortion of the reference scales due to substrate roughness was identified as the main source of imprecision. Acoustic positioning was generally inaccurate and bottom tracking unreliable on rough terrain. Subtransect lengths assessed with PhotoModeler were on average 20% longer than those derived from acoustic positioning due to the higher spatial resolution and the inclusion of slope. On a high relief wall bottom tracking and 3-D modelling yielded similar results. At present, 3-D modelling is the most powerful, albeit the most time-consuming, method for accurate determination of video subtransect dimensions.
空间范围	Median Latitude: -60.331084 * Median Longitude: -65.417100 * South-bound Latitude: -64.915000 * West-bound Longitude: -74.936215 * North-bound Latitude: -51.169000 * East-bound Longitude: -60.651000
时间范围	2007-01-22T10:23:24 - 2012-02-29T14:38:02
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/233570
推荐引用方式 GB/T 7714	Fillinger,Laura,Funke,et al. 3D models created from ROV videos and their corresponding subtransect dimensions.2013-12-11.https://doi.org/10.1594/PANGAEA.803844.