Napa Watershed, CA

These data were acquired by the <a href='https://ncalm.cive.uh.edu/.html' target='_blank'>National Center for Airborne Laser Mapping (NCALM)</a> in 2003. They have kindly agreed to make these data available to the research community through OpenTopography.<br><br>Note: This is a classified last return dataset (i.e. there is not first return / canopy top data included). A bare earth model can be created from these data, but a model generated from the full point cloud produces something that approximates a low vegetation surface - not ground, but also not canopy top.<br><br>UPDATE: <a href=\"https://cloud.sdsc.edu/v1/AUTH_opentopography/PC_Bulk/Napa/NAPA_ASCII_03/Unfiltered_XYZ/\">Full unfiltered 2003 point cloud ASCII files</a>. Bulk download of the original unfiltered ASCII files (64 GB) from the 2003 Napa Watershed collection by the National Center for Airbone Laser Mapping (NCALM). The original ASCII data has been made available in response to the August 26, 2014 Mw 6.0 South Napa Earthquake.<p><br>Publications associated with this dataset can be found at <a href=\"http://calm.geo.berkeley.edu/ncalm/dtc.html\" target=\"_blank\">NCALM's Data Tracking Center</a></p>

本数据集由<https://ncalm.cive.uh.edu/.html target='_blank'>美国国家机载激光测绘中心（National Center for Airborne Laser Mapping, NCALM）</a>于2003年采集，该中心已欣然同意通过OpenTopography向科研社区开放这批数据。<br><br>注意：本数据集为分类后的末次回波（last return）数据集（即未包含首次回波（first return）/冠层顶部（canopy top）相关数据）。可基于这批数据生成裸地模型（bare earth model），但仅由完整点云（point cloud）生成的模型会得到近似低植被表面的结果——既非地表，亦非冠层顶部。<br><br>更新：<a href="https://cloud.sdsc.edu/v1/AUTH_opentopography/PC_Bulk/Napa/NAPA_ASCII_03/Unfiltered_XYZ/">完整未过滤2003点云ASCII（ASCII file）文件</a>。该资源为美国国家机载激光测绘中心（NCALM）2003年纳帕流域采集的原始未过滤ASCII文件批量下载包（总大小64GB）。本次公开的原始ASCII数据，是为响应2014年8月26日发生的Mw6.0级南纳帕地震。<p><br>与本数据集相关的学术出版物可在<http://calm.geo.berkeley.edu/ncalm/dtc.html target="_blank">NCALM数据追踪中心</a>查询获取。</p>