NSW Marine LiDAR Topo-Bathy 2013 Geotif & Point Cloud

Remotely sensed topographic (elevation) and bathymetric (depth) information were acquired for targeted sections of the NSW mid-north coast using Airborne LiDAR Bathymetry (ALB - a combination of Light Detection And Ranging (LiDAR) and Laser Airborne Depth Sounding (LADS) sensors) during November - December 2013. This resource defines total area of 139 km2 of data covering areas around the locations of 1) Lake Cathie and 2) Old Bar. Data were acquired by Pelydryn Ltd on behalf of NSW Office of Environment and Heritage (now the Department of Planning and Environment) using a HawkEye IIb bathymetric LiDAR system aboard VH-CWG Aircraft. Funding was provided through NSW Office of Environment and Heritage to acquire high-quality, high-resolution baseline data to support coastal erosion studies. The survey requirement was to provide high-resolution data at a minimum of 5 x 5 m laser spot spacings from the mean high-water mark to ~200m inland, and from the shore, seaward (LADS - bathymetry) up to maximum ~5km offshore (~20-40m water depth depending on in-water conditions). Positioning data were collected on the ellipsoid ITRF 2014 GRS80 in UTM Z56 and post-processed using local base stations (CORSnet NSW) to provide a Post Processed Kinematic GNSS solution for final aircraft trajectory before being applied to all data. Data types available are as GeoTiff (L3) or classified LAS format point cloud (L2) issued transformed to GDA94 Z56. Other data types may be available as ESRI topo-bathy rasters and contours, tab delimited ascii XYZ, unclassified LAS format data, relative reflectance data (terrestrial, marine) and Quality Control (QC) documentation (contained within survey report) via the NSW DPE Information Asset Register (IAR) (metadata, coverage shape), SEED (https://seed.nsw.gov.au or upon request. Users note: these surveys achieved maximum depths of ~15m and some artefacts may be apparent in the nearshore potentially associated with in-water conditions (i.e. algae; turbidity). The data are intended to inform coastal and marine management and are ‘not for navigation’.2013年11月至12月期间，研究团队采用机载激光测深系统（Airborne LiDAR Bathymetry，简称ALB），即激光雷达（Light Detection And Ranging，简称LiDAR）与机载激光测深（Laser Airborne Depth Sounding，简称LADS）传感器的组合方案，针对新南威尔士州（New South Wales，简称NSW）中北部海岸的目标区域，获取了遥感地形（高程）与水深（深度）数据。本数据集涵盖总面积139平方千米的有效数据，覆盖两处区域：1）凯西湖（Lake Cathie）周边；2）旧巴尔（Old Bar）周边。本次数据由Pelydryn有限公司受新南威尔士州环境与遗产局（现更名为规划与环境部）委托，搭载VH-CWG号航空器，使用HawkEye IIb型测深激光雷达系统采集完成。新南威尔士州环境与遗产局为本次数据采集提供了资助，旨在获取高质量、高分辨率的基准数据，以支撑海岸侵蚀相关研究。本次勘测的技术要求为：从平均高潮线向内陆延伸约200米的区域，以及从岸线向海方向（LADS模块负责水深测量）延伸至最大约5公里的近远海区域（根据水下环境不同，水深范围约20-40米），均需提供激光点间距不小于5×5米的高分辨率数据。定位数据采用国际地球参考框架2014（ITRF 2014）GRS80椭球基准下的通用横轴墨卡托投影（UTM）Z56坐标系采集，并通过本地基准站（CORSnet NSW）进行后处理，生成后处理运动学GNSS解算结果以优化航空器飞行轨迹，最终将该结果应用于全部数据的校准。可获取的数据格式包括转换至澳大利亚大地坐标系1994版（GDA94）UTM Z56区的GeoTIFF（L3级）与分类LAS格式点云（L2级）。其他数据类型可通过新南威尔士州规划与环境部（NSW DPE）信息资产登记库（Information Asset Register，简称IAR，含元数据、覆盖范围矢量）以及SEED平台（https://seed.nsw.gov.au）获取，或可通过申请获取，包括环境系统研究所（ESRI）地形水深栅格与等值线、制表符分隔的ASCII XYZ格式数据、未分类LAS格式数据、地表与海洋相对反射率数据，以及包含于勘测报告中的质量控制（Quality Control，简称QC）文档。用户须知：本次勘测的最大测深约为15米，近岸区域可能存在部分与水下环境（如藻类、浊度）相关的伪影。本数据集旨在为海岸与海洋管理提供决策支撑，不得用于导航用途。