2010 USACE NCMP Topobathy Lidar DEM: Northeast Atlantic Coast (CT, MA, ME, NH, RI)

These files contain bare earth rasterized topographic and bathymetric lidar elevations generated from data collected by a HawkEye II (HEII) lidar sensor. The HEII integrates topographic and bathymetric lidar sensors, and a digital camera on a single remote sensing platform for use in coastal mapping and charting activities. Data coverage generally extends along the CT, MA, ME, NH, RI coastline, from the waterline onshore 500m and offshore 1000 meters or to laser extinction. Native lidar data is not generally in a format accessible to most Geographical Information Systems (GIS). Specialized in-house and commercial software packages are used to process the native lidar data into 3D positions that can be imported into GIS software for visualization and further analysis. The 3D position data are sub-divided into a series of files, each covering approximately 5 kilometers of shoreline.

In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

These data were collected as a part of the National Coastal Mapping Program (NCMP) to depict the elevations above and below the water along the CT, MA, ME, NH, RI coastal zone.

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.

Data is available online for bulk and custom downloads.

None

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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.

The data positions were obtained using post processed inertially aided KGPS methods.

The horizontal accuracy of the topographic data is better than 0.50 m RMSE.

The horizontal accuracy of the bathymetric data is better than 1.50 m RMSE.

The data positions were obtained using post processed inertially aided KGPS methods.

Topographic data tested 0.172 m fundamental vertical accuracy at 95 percent confidence level (8.8 cm RMSE) in open terrain using RMSEz x 1.9600.

Tested 0.270 m supplemental vertical accuracy at 95th percentile in short grass.

Tested 0.553 m supplemental vertical accuracy at 95th percentile in tall grass.

Tested 0.640 m supplemental vertical accuracy at 95th percentile in brush/canopy.

The vertical accuracy of the bathymetric data is better than 0.27 m RMSE.

Complete

Topographic data provided in this file were tested against ground truth data. Tested 0.172 m fundamental vertical accuracy at 95 percent confidence level in open terrain using RMSEz x 1.9600.

Bathymetric data provided in this file were tested against crosslines and adjacent lines. At these locations the lidar data matched within 0.27 meters

The USACE collected, processed, and provided the data to the NOAA Office for Coastal Management (OCM). OCM received the data and processed it to be available for custom download from the Data Access Viewer (DAV) and for bulk download from https.