NEON prototype bathymetric sonar data from D08 BLWA, 2017

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涵盖湖泊及不可涉水溪流（河流）的水深数据、沉积物与底质特征，以及水生植物的存在与否、大致丰度、分布范围与个体尺寸。高精度水深（水深测量）地图的生成需采用搭载于船舶、与差分全球定位系统（DGPS）联动的整套水声仪器完成采集。广域增强系统（WAAS）是一类可将定位精度提升至3米以内的DGPS技术。利用侧扫声呐（side scan sonar）可获取生物群落、底质及底栖构造的声学影像，此类影像将在后处理阶段完成地理配准与图像镶嵌。本文件提供的数据为采集后仅经过极少或未经过后处理的原始声呐数据文件，未被用于制作水深或生境地图。