Data for: A generalised volumetric method to estimate the biomass of photographically surveyed benthic megafauna

Standing stocks of biomass and biovolume as directly and indirectly estimated from photographs using a length-weight relationship (LWR) approach and a generalised volumetric method (GVM).
The datasets correspond to:
- the fresh trawl-caught specimens from the Porcupine Abyssal Plain Sustained Observatory (PAP-SO; 4850m water depth, northeast Atlantic);
- the case study of benthic ecology based on a large photographic dataset derived from AUV surveys on the Celtic Shelf (100 m water depth, northeast Atlantic);
- the inter-operator variation assessment of biomass and biovolume estimation using the LWR method and the GVM.

采用长度-重量关系（length-weight relationship, LWR）方法与广义体积法（generalised volumetric method, GVM），通过照片直接与间接估算得到的生物量与生物体积现存量数据集。
本数据集涵盖以下三类内容：
- 豪猪深渊平原持续观测站（Porcupine Abyssal Plain Sustained Observatory, PAP-SO；水深4850米，大西洋东北部）的新鲜拖网捕获标本；
- 基于凯尔特陆架（水深100米，大西洋东北部）自主水下航行器（Autonomous Underwater Vehicle, AUV）调查所得的大型照片数据集开展的底栖生态学案例研究；
- 采用LWR方法与GVM开展的生物量与生物体积估算的操作者间变异评估。