2004 Federal Emergency Management Agency (FEMA) Bare Earth Topographic LiDAR: Connecticut
This kmz file shows the extent of coverage for the 2004 FEMA Connecticut River lidar
LiDAR data is remotely sensed high-resolution elevation data collected by an airborne
collection platform. The LiDAR files were converted from .PTS format to LAS V1.2.
All data is Bare Earth, with 99% of all buildings removed and 95% of all vegetation
removed. There is no information available for return number, scan angle, GPS time,
or intensity. This data set covers approximately 1,233.83 square miles (3,195.6 sq
km) of the Connecticut River.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||Federal Emergency Management Agency, Region I
Documentation links not available.
- DHS/FEMA > Federal Emergency Management Agency, U.S. Department of Homeland Security
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||The purpose of this LiDAR data was to produce high accuracy 3D elevation based geospatial
products for coastal flood mapping.
||2004-05-12 to 2004-06-16
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- New London County
- Middlesex County
- Hartford County
- United States
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- The NOAA Coastal Services Center (CSC) received the topographic files in .PTS format.
The files contained lidar elevation measurements. The data were received in Connecticut
State Plane coordinates, NAD83 (Zone 0600) and were vertically referenced to NAVD88
using the Geoid99 model. The vertical units of the data were feet. CSC performed the
following processing for data storage and Digital Coast provisioning purposes: 1.
The .PTS files were converted to LAS V1.2 2. All points were set to Class 2 (Bare
Earth) 3. The topographic las files were converted from a Projected Coordinate System
(Connecticut State Plane) to a Geographic Coordinate system (NAD83). 4. The topographic
las files' horizontal units were converted from US survey feet to decimal degrees.
5. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal
heights using Geoid99. 6. The topographic las files' vertical units were converted
from survey feet to meters. 7. 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: 2013-05-15
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