2006 Federal Emergency Management Agency (FEMA) Lidar: Nueces County, Texas

Spectrum Mapping, LLC was tasked by MAPVI - URS Corporation, Albuquergue, to provide airborne Light Detection and Ranging (Lidar)

of approximately 620 square miles around Nueces County, Texas. MAPVI (Mapping Alliance Partnership VI for FEMA Region IV) is a

joint venture of URS Corporation, Greenhorne & O'Mara and Spectrum Mapping. Spectrum followed data collection and processing

procedures for Federal Emergency Management Agency (FEMA) Guidelines and Specifications Appendix A.

Data product deliverables included Lidar to support 2 foot contours. Spectrum's acquisition division collected the Lidar data

on June 19, 22-25, 27, 28 and July 16 and 17, 2006. The project was collected with a Rams ALS50 Lidar sensor, including an

inertial measurement unit (IMU) and a dual frequency Global Positioning System (GPS) receiver and antenna.

Upon receipt of this data, the NOAA Coastal Serices Center reclassified all non-ground data to a classification of 1 (Unclassified)

and all ground points to a classification of 2 (Ground).

Original contact information:

Contact Org: Federal Emergency Management Agency (FEMA)

Phone: 877-336-2627

Email: miphelp@mapmodteam.com

This LIDAR operation was designed to provide a high density set of masspoints within the defined areas. The data

sets are suitable for the development of contours for use in hydraulic/hydrologic model development, and for assessing

environmental impacts. Typical uses for the data set include: FEMA Flood Plain Map Modernization, DFIRM map updates,

watersheds and other hydro studies per FEMA specifications, county mapping projects, and flood mitigation assessment.

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The Accuracy Assessment, Cleanliness Report and Final Report for the Nueces County Lidar

may be viewed at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/548/supplemental

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/548/supplemental/2006_FEMA_Lidar_Nueces_County.kmz

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

FEMA, the Office for Coastal Management or its partners.

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

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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.

Compiled to meet FEMA specs for 2 foot contours.

The tested Root Mean Square Error (RMSE) in the project area was 9.668 cm (0.3172 ft)

using 36 checkpoints.

The Accuracy Assessment, Cleanliness Report and Final Report for the Nueces County Lidar may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/548/supplemental/index.html

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