2005 Mississippi Merged LiDAR Data (2005 LiDAR data merged with 2005 Post-Katrina LiDAR data to create a bare-earth product for flood plain mapping in coastal Mississippi).

Pre- and post-hurricane Katrina LiDAR datasets of Hancock, Harrison, and Jackson Counties, MS, were merged into a seamless

coverage by URS. The pre-Katrina LiDAR data was collected by EarthData International at a 5-meter posting density during the period

of February 25 to March 30, 2005. Woolpert and USACE collected the post-Katina LiDAR data. Woolpert acquired 1-meter posting

density data of Coastal Mississippi between the dates of September 19 and October 9, 2005. USACE collected 1-meter posting density

LiDAR of the Mississippi barrier islands over the same time period. Each dataset was clipped at the approximate location of the

debris line. Data south of the debris line was removed from the Mississippi LiDAR dataset. Data north of the debris line was

removed from the post-Katrina LiDAR dataset. The post-Katrina LIDAR dataset was then imported into the seamless Mississippi LiDAR

dataset creating a merged seamless coverage.

Original contact information:

Contact Org: NOAA Office for Coastal Management

Phone: 843-740-1202

Email: coastal.info@noaa.gov

Develop a post-hurricane Katrina LiDAR dataset that can be used to support flood-plain mapping and other coastal management

applications.

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The Mississippi Coastal Analysis Project, LiDAR Topographic Data Compilation Report, may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/36/supplemental/index.html

Any conclusions drawn from analysis of this information are not the responsibility of NOAA or the Office for Coastal Management or its partners.

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

None

Users should be aware that temporal changes may have occurred since these datasets were 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this data may no longer represent actual surface conditions.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.

1. LiDAR data was collected and processed in accordance with FEMA guidance as published in Appendix A, February, 2002.

2. LiDAR data at the interface between the land and ocean was collected (when possible) during periods when tides were predicted

to be below mean lower low water.

3. LiDAR data accuracy is in accordance with the National Standard for Spatial Data Accuracy (NSSDA). When compared to

GPS survey grade points in generally flat non-vegetated areas, at least 95% of the positions have an error less

than or equal to 36.3 cm (equivalent to root mean square error of 18.5 cm if errors were normally distributed).

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Complete

Compliance with the accuracy standard was ensured by the placement of GPS ground control prior to the

acquisition of LiDAR data. The following checks were performed.

1. The ground control and airborne GPS data stream were validated through a fully analytical boresight adjustment.

2. The DTM (Digital Terrain Model) data were checked against the project control.

3. LiDAR elevation data was validated through an inspection of edge matching and visual inspection for quality (artifact removal).