2004 Federal Emergency Management Agency (FEMA) Bare Earth Topographic LiDAR: Connecticut River

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.

The purpose of this LiDAR data was to produce high accuracy 3D elevation based geospatial products for coastal flood mapping.

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A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1473/supplemental/ct2004_fema_connecticutriver_footprint.KMZ

Bare earth LiDAR point data in LAS 1.2 format

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Any conclusions drawn from the analysis of this information are not the responsibility

of Spectrum Mapping LLC, FEMA, NOAA, the Office for Coastal Management or its partners.

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

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1473

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Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use

this data for critical applications without a full awareness of its limitations. These data depict the heights at the time of the survey and are only accurate for that time.

Raw elevation measurements have been tested to 0.15 meters vertical accuracy at 95 percent confidence level.

The data received by the NOAA Office for Coastal Management lacking substantial portions of metadata. The stated RMSEz is given below, but no description of accuracy testing was given.; Quantitative Value: 0.15 meters, Test that produced the value: Value in meters. Tested vertical root mean square error (RMSEz).

While the NOAA Office for Coastal Management makes every effort to provide accurate and complete information, OCM provides no guarantee as to the accuracy, reliability or completeness of

this data set. Please note OCM received this data from an outside source and is only distributing the data publicly.

All LiDAR files delivered were verified using commercial GIS software by the NOAA Office for Coastal Management to ensure they open and are positioned properly.