2010 Federal Emergency Management Agency (FEMA) Topographic Lidar: Coastal Massachusetts
and Rhode Island
This kmz file shows the extent of coverage for the 2010 FEMA Coastal Massachusetts
and Rhode Island lidar data set.
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).
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
- DHS/FEMA > Federal Emergency Management Agency, U.S. Department of Homeland Security
- Strategic Alliance for Risk Reduction (STARR)
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||Terrain data is used to represent the topography of a watershed and/or floodplain
environment and to extract useful information for hydraulic and hydrologic models.
(Source: FEMA Guidelines and Specs, Appendix N) This digital data is produced for
the purposes of updating/creating a DFIRM database.
||2009-11-16 to 2010-02-04
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Land Surface
- Elevation Data
- Rhode Island
- Dukes County
- Kent County
- Nantucket County
- Newport County
- Providence County
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- 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.
- The NOAA Coastal Services Center (CSC) 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. CSC 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. 5. The data were converted
to LAZ format.
- The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are currently
being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS or LAZ
The LAS format is an industry standard for LiDAR data developed by the American Society
of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version
LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively
in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically
the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most
up to date geoid model when transforming to orthometric heights.
Metadata Last Modified: 2013-10-17
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