2009 USACE NCMP Topobathy Lidar: Atlantic Coast (NC, VA)

Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base.

Bulk download of data files in LAZ format, geographic coordinates, orthometric heights. Note that the vertical datum (hence elevations) of the files here are different than described in this document.

Information on the NOAA Office for Coastal Management (OCM)

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

This graphic displays the footprint for this lidar data set.

Link to custom download, from the Data Access Viewer (DAV), the raster Digital Elevation Model (DEM) data for the North Carolina coastline, that were created from this lidar data set.

These data were collected using the CHARTS system. It is owned by the Naval Oceanographic Office and operated through contract. The system collects topographic lidar data at 9 kHz, bathymetric lidar data at 1 kHz and RGB imagery at 1Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well. Aircraft position, velocity and acceleration information are collected through a combination of Novatel and POS A/V 410 equipment. All raw data streams are transferred to the office for downloading and processing in SHOALS GCS software. Aircraft position data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. Upon inspection and QA/QC in the software packages Fledermaus and PFM_ABE, anomalous data are flagged as invalid. PFM_ABE's chartsLAS module then converts all valid data from ellipsoid to orthometric heights based on the NGS' GEOID03 model and exports topographic data as a series of LAS files with a single file per flightline per 5km box.

The topographic flightline LAS files were imported into TerraMatch, a TerraSolid application that runs in Microstation. Upon import into TerraMatch, the data is converted from Geographic to UTM Zone18 North coordinates. Misalignment angles between individual flightlines were computed for both points classified as “ground” and points classified as “buildings”. These angles were utilized in an iterative process to adjust each flightline’s roll, pitch and heading bias values, in order to minimize mis-alignments between flight lines. Final horizontal alignments were QC’d by viewing cross-sections taken throughout the data coverage on features such as buildings and rooftops. Vertical adjustment to ground control, where available, or to prior survey surfaces, in the absence of ground control, was performed utilizing hard surfaces including roads and parking lots. Final QC was performed to verify all horizontal and vertical adjustments to the data.

These data were then read into GeoCue and LP360 to have valid bathymetric data added as class 29 and converted to LAS 1.2

The NOAA Office for Coastal Management (OCM) received 62 laz files in las 1.2 format from JALBTCX. The files contained lidar intensity and elevation measurements for the project area. Horizontal positions were provided in geographic coordinates, referenced to the North American Datum of 1983. Vertical positions were provided in ellipsoid elevations and in meters. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. Assigned the geokeys, sorted the data by gps time and copied the data to database and to https.