NEON prototype bathymetric sonar data from D03 BARC, 2014 (June)

The Bathymetric and Morphological Map data product provides depths of lakes and non-wadeable streams (rivers), sediment and substrate characteristics, as well as the presence or absence, approximate abundance, distribution, and size of underwater flora. High accuracy depth (bathymetric) maps are obtained using a suite of hydroacoustic instrumentation interfaced with a differential global positioning system (DGPS) mounted on a vessel. The Wide Area Augmentation System (WAAS) is a form of DGPS that provides enhanced position accuracy (<3 m). Acoustic images of biota, substrate, and benthic structures are obtained with side scan sonar which are georeferenced and mosaicked in post-processing. The data provided in this file are raw sonar data files with little or no post processing that were collected but not used to develop bathymetric or habitat maps.

本水深与地貌地图数据集产品可提供湖泊及不可涉水溪流（河流）的水深数据、沉积物与底质特征，以及水下植物的有无、大致丰度、分布范围与单体规模。高精度水深（Bathymetric）地图通过搭载于作业船舶的整套水声仪器（Hydroacoustic Instrumentation）与差分全球定位系统（Differential Global Positioning System, DGPS）联机集成获取。广域增强系统（Wide Area Augmentation System, WAAS）作为差分全球定位系统的增强分支，可实现优于3米的定位精度。利用侧扫声呐（Side Scan Sonar）可获取生物群落、底质及底栖结构的声学影像，此类影像将在后期处理中完成地理配准与图像镶嵌。本文件所提供的数据为采集后仅经过极少或未经过后期处理的原始声呐数据文件，此类数据虽已采集，但未被用于生成水深或生境地图。