2007 USACE NCMP Topobathy Lidar: Lake Erie (NY, PA)

New York

Pennsylvania

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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.

These data were collected using the CHARTS surveys system. It is owned by the Naval Oceanographic Office and Operated through contract. The system collects topographic lidar data at 20kHz and hydrographic data at 3kHz. The system also collects 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 equipment.

Raw data are collected and transferred to the office for downloading and processing in SHOALS GCS software. GPS data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. These data are edited using Fledermaus software where anomalous data are removed from the dataset.

The data are converted from ellipsoid to orthometric heights, based

on the GEOID03 model, within the chartsLAS program. The heights were converted from ellipsoid to orthometric heights (NAVD88) using NGS' Geoid03 model file "g2003u08.bin" with the results in meters. Once converted to orthometric heights, the data were then converted to IGLD85 using the VDatum program from NOAA (National Oceanic and Atmospheric Administration). The LAS files output form chartsLAS were read into TerraScan and filters were applied to classify ground points. Points designated as ground are assigned a classification value "2" and all other points are assigned the classification value "1" which represents an unclassified state. Once classified, the points were exported through TerraScan and converted to .las format.

This data set was received from JALBTCX in 2018. This is 2007 data that JALBTCX reprocessed (converted to las format and reclassed to 1 - Unclassified, 2 - Ground, and 29 - Bathymetric Point).

The NOAA Office for Coastal Management (OCM) received 23 las files from USACE JALBTCX. The lidar data had elevation and intensity measurements. The data were in geographic coordinates and IGLD85 elevations in meters. The data were classified as: 1 - Unclassified, 2 - Ground, 29 - Bathymetric Point. OCM processed all classifications of points to the Digital Coast Data Access Viewer (DAV). Classes available on the DAV are: 1, 2, 29.

OCM performed the following processing on the data for Digital Coast storage and provisioning purposes:

1. The LAStools software scripts lasinfo and lasvalidate were run on the las files to check for errors.

2. An internal OCM script was run to check the number of points by classification and by flight ID and the gps time and intensity ranges.

3. The LAStools software script laszip was run to convert the las files to laz format.

4. The files were converted from IGLD85 to NAVD88 (Geoid12b) elevations using the NOAA VDatum tool.

5. Internal OCM scripts were run on the laz files to convert from NAVD88 elevations to ellipsoid elevations using Geoid12b, assign the geokeys, to sort the data by gps time and zip the data to database and to http.