Data Management Plan

MASSACHUSETTS AND RHODE ISLAND: The U.S. Army Corps of Engineers collects (by themselves and contractors) and maintains LiDAR data

including orthophotos in coastal areas of the United States and its territories. The Corps acquires this data in the

course of performing its mission of Flood Control, Navigation, Environmental Engineering, and support for the Army and others.

Topographic LIDAR datasets were collected using a SHOALS-1000T at 500m altitude, spot density of 2m x 1 m and sampling rate 10kHz.

Bathymetric data were collected using a SHOALS-1000T hydrographic laser flying at 400m altitude, spot spacing 5m x 5m and 1kHz

sampling rate.

MA and RI Data Date of Collection: Topo 20051111-20051202 Bathy: 20070527-20070601

MAINE: The U.S. Army Corps of Engineers collects (by themselves and contractors)and maintains LiDAR data including orthophotos

in coastal areas of the United States and its territories. Topographic LIDAR datasets were collected using a SHOALS-1000T at

500m altitude, spot density of 2m x 1m and sampling rate of 10 kHz. Topo data were also collected with a Leica ALS-50 sensor

at 1600m altitude spot spacing of 1m x 1m spot spacing, and 133 kHz sampling rate. Bathymetric data were collected using a

SHOALS-1000T hydrographic laser flying at 400m altitude, spot spacing 5m x 5m and 1kHz sampling rate.

ME Data Date of Collection: Topo 20051019-20070806 Bathy: 20070606-20070611

Original contact information:

Contact Org: JALBTCX

Title: Data Production Manager

Phone: 228-252-1103

Email: shoals-info@sam.usace.army.mil

Process Steps:

• 2008-04-29 00:00:00 - FOR MASSACHUSETTS AND RHODE ISLAND DATA Acquisition LIDAR data were acquired using a SHOALS-1000T. Sensor orientation was measured using a POS AV 410. Prior to survey PDOP was checked and missions planned to avoid PDOP greater than 3.0. During survey the plane was always within 30km of a GPS ground control point, to provide a good quality position solution. Final positions were determined using a post-processed inertially aided Kinematic GPS (KGPS) solution. GPS ground control data were acquired at 1Hz. Data received by the airborne system were continually monitored for data quality during acquisition operations. Display windows showed coverage and information about the system status. In addition, center waveforms at 5Hz were shown. All of this information allowed the airborne operator to assess the quality of data being collected. Data were processed in the field to verify coverage and data quality. Processing SHOALS-1000T data were processed using the SHOALS Ground Control System (GCS). The GCS includes links to Applanix POSPac software for GPS and inertial processing, and IVS Fledermaus software for data visualization, 3D editing and tie-line analysis. All data were processed in NAD83 horizontal and vertical datum. Data were later converted to the NAVD88 vertical datum using the GEOID03 model. Fugro in-house utilities were used to split the data in to pre-defined boxes, each covering approximately 5km of shoreline. ASCII files include Longitude, Latitude, UTM Zone, Easting (UTM), Northing, Elevation, Elevation (NAD83), Date, Time, Intensity (Topo). FOR MAINE DATA Acquisition Lidar data were acquired using a SHOALS-1000T. Sensor orientation was measured using a POS AV 410, while images were acquired at 1Hz using a Duncantech DT4000 digital camera. Prior to survey PDOP was checked and missions planned to avoid PDOP greater than 3.0. During survey the plane was always within 30km of a GPS ground control point, to provide a good quality position solution. Final positions were determined using a post-processed inertially aided Kinematic GPS (KGPS) solution. GPS ground control data were acquired at 1Hz. Topographic Data were also acquired using a Leica ALS-50 operated by Fugro EarthData. Processing SHOALS data were processed using the SHOALS Ground Control System (GCS). The GCS includes links to Applanix POSPac software for GPS and inertial processing, and IVS Fledermaus software for data visualization, 3D editing and tie-line analysis. ALS-50 data were processed the TerraSolid Terrascan software. Applanix POSPac software was used for GPS and inertial processing. All data were processed in NAD83 horizontal and vertical datum. Data were later converted to the NAVD88 vertical datum using the GEOID03 model. Fugro in-house utilities were used to split the data in to pre-defined boxes, each covering approximately 5km of shoreline. ASCII files include Longitude, Latitude, UTM Zone, Easting (UTM), Northing, Elevation, Elevation (NAD83), Date, Time, Intensity (Topo).
• 2009-04-20 00:00:00 - The NOAA Office for Coastal Management (OCM) received topo and hydro files in ASCII format. The files contained Lidar elevation and intensity measurements. Both the topo and hydro points were classed as 'never classified.' The data were provided in Geographic coordinates and ellipsoid and orthometric heights. OCM performed the following processing to the ellipsoid height data to make it available within the Digital Coast: 1. LASEdit was used to convert the ASCII formatted files to las format. 2. Both the topo and the hydro points were classified as 'never classified.' Points in the files marked as hydro where from the green laser. Their classification was changed to class 11. They generally contain bathy points, but there may be some points on land. Those points could include vegetation or other non-ground objects. Topo laser points were changed to 'unclassified.' 3. The LAS data were sorted by latitude and the headers were updated. 4. The data were filtered to eliminate elevation outliers.
• 2022-12-16 00:00:00 - The non-hydro data were classified using programs in the LAStools package. Steps included: 1) conversion to UTM zone 19 2) ground classification with lasground_new 3) height determination with lasheight 4) building and vegetation classification with lasclassify using a step of 4 5) conversion from UTM zone 19 to geographic

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer;