Data Management Plan (Deprecated)

Terrain data, as defined in FEMA Guidelines and Specifications, Appendix N: Data Capture Standards, describes the digital topographic data that was used to

create the elevation data representing the terrain environment of a watershed and/or floodplain. Terrain data requirements allow for flexibility in the

types of information provided as sources used to produce final terrain deliverables. Once this type of data is provided, FEMA will be able to account for the

origins of the flood study elevation data. (Source: FEMA Guidelines and Specifications, Appendix N, Section N.1.2).

Process Steps:

• 2010-04-14 00:00:00 - AERO-METRIC, INC. established accurate LiDAR trajectory coordinates for portions of Dukes, Kent, Nantucket, Newport, and Providence counties flown at 1660 meters above mean terrain. The information allows photogrammetrists to position the LiDAR imagery with minimal ground control and maintain the standards published by the Federal Geographic Data Committee. In conjunction with the AirBorne Global Positioning and Inertial Measuring System (ABGPS/IMU), 131 ground control points (checkpoints) were established to validate the accuracy of the LiDAR data. Airborne GPS/IMU surveys were completed between November 16, 2009 and February 4, 2010 during the acquisition of the LiDAR data. Ground control surveys were completed between November 19 and December 9, 2009. Airborne GPS/IMU and ground control surveys were completed for the project site, under FEMA Task Order No. HSFE01-09-J-001, Work Order No. AM 01 01 001 entered into on November 5, 2009 between the STARR and AERO-METRIC, INC.
• 2013-09-01 00:00:00 - The NOAA Office for Coastal Management (OCM) received the topographic files in LAS V1.2 format. The files contained lidar elevation measurements, classifications, intensity data, return information, GPS time, scan angle and source ID. The data were received in either NAD83 Mass State Plane Island (Zone 2002) coordinates or NAD83 Rhode Island State Plane (Zone 3800) and were vertically referenced to NAVD88 using the Geoid03 model. The vertical units of the data were feet. OCM performed the following processing for data storage and Digital Coast provisioning purposes: 1. The topographic las files were converted from a Projected Coordinate System (MASS SP 2002/RI SP 3800) to Geographic coordinates (NAD83). 2. The topographic las files' horizontal units were converted from US feet to decimal degrees. 3. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid03. 4. The topographic las files' vertical units were converted from feet to meters.

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

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2555

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