2015 NOAA NGS Topobathy Lidar DEM: Buzzards Bay Block3 (MA)

These data were collected and derived by the National Oceanic Atmospheric Administration, National Geodetic Survey (NGS) Remote Sensing Division using a Riegl VQ820G system. The data were acquired from 20151109 - 20151123. The data includes topobathy data in an ERDAS Imagine (IMG) format and a 1 m grid size. The DEM data includes utilization of ground (2), bathymetric point (26), submerged object (29), and International Hydrographic Organization (IHO) S-57 object (30) classification fields from LAS files. An automated ground classification algorithm was used to determine bare earth point classification. It should be noted that not all returns may be correctly classified; therefore the user should examine for acceptability. In addition to the DEMs, the topobathy lidar point data are also available. These data are available for download here: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5101

Original contact information:

Contact Org: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division

Title: Chief, Remote Sensing Division

Phone: 301-713-2663

This lidar data and derivatives are an ancillary product of NOAA's Coastal Mapping Program (CMP), created through a wider Integrated Ocean and Coastal Mapping initiative to increase support for multiple uses of the data. In addition, it will be used for ongoing research efforts for testing and developing standards for airborne lidar.

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These data have been developed from the best available sources. Although efforts have been made to ensure that the data are accurate and reliable, errors and variable conditions originating from physical sources used to develop the data may be reflected in the data supplied. Users must be aware of these conditions and bear responsibility for the appropriate use of the information with respect to possible errors, scale, resolution, rectification, positional accuracy, development methodology, time period, environmental and climatic conditions and other circumstances specific to these data. The user is responsible for understanding the accuracy limitations of the data provided herein. The burden for determining fitness for use lies entirely with the user. The user should refer to the accompanying metadata notes for a description of the data and data development procedures. Any conclusions drawn from the analysis of this information are not the responsibility of the National Geodetic Survey, the Office for Coastal Management, or its partners.

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5170

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Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.This LIDAR data set is not intended for removal of features such as wrecks, rocks and obstructions.

OS Independent

The data positions were obtained using post processed KGPS methods. The horizontal accuracy of the data is better than plus or minus 1.0 m.; Quantitative Value: 1.0 meters, Test that produced the value: 2 Sigma

The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than plus or minus 0.15 m.; Quantitative Value: 0.15 meters, Test that produced the value: 2 Sigma

Not applicable

Not applicable