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

browse graphicThis kmz file shows the extent of coverage for the 2006 FEMA Nueces County, TX lidar data set.
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).

Cite this dataset when used as a source.

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    Distribution Formats
    • LAZ
    Distributor DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Point of Contact Federal Emergency Management Agency (FEMA), Region VI
    940-898-5165
    Associated Resources
    • Lidar Dataset Supplemental Information
    Originator
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Originator
    • Federal Emergency Management Agency (FEMA)
    Publisher
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    Date(s)
    • publication: 2006-12-21
    Data Presentation Form: Digital image
    Dataset Progress Status Complete
    Data Update Frequency: Not planned
    Purpose: 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.
    Use Limitations
    • These data depict the elevations at the time of the survey and are only accurate for that time. 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. Any conclusions drawn from analysis of this information are not the responsibility of NOAA or any of its partners. These data are NOT to be used for navigational purposes.
    Time Period: 2006-06-22 2006-06-27 2006-07-16  to  2006-06-25 2006-06-28 2006-07-17
    Spatial Reference System: urn:ogc:def:crs:EPSG::4269 Ellipsoid in Meters
    Spatial Bounding Box Coordinates:
    N: 28.016539
    S: 27.556339
    E: -97.041570
    W: -97.944170
    Spatial Coverage Map:
    Themes
    • Bathymetry/Topography
    • Land Surface
    • Topography
    • Digital Terrain Model
    • Elevation Data
    • LIDAR
    • Breaklines
    • Contours
    • DEM
    • Flow vectors
    Places
    • United States
    • Texas
    • Nueces County
    Use Constraints No constraint information available
    Fees Fee information not available.
    Lineage Statement Lineage statement not available.
    Processor
    • Spectrum Mapping, LLC
    • DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Processing Steps
    • 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. Dates of data processing were June 19 - October 2, 2006.
    • The NOAA Coastal Services Center (CSC) received the files in las format. The files contained Lidar elevation and intensity measurements. The data was in Texas State Plane coordinates - South (FIPS Zone 4205), NAD83 and NAVD88 Geoid 03 vertical datum and US Survey Feet. CSC performed the following processing to the data to make it available within the Digital Coast: 1. The data were converted from Texas State Plane coordinates to geographic coordinates. 2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03. 3. The data were converted from US Survey feet to meters. 4. The LAS data were sorted by latitude and the headers were updated. 5. All non-ground data reclassified to a classification of 1 (Unclassified) and all ground points reclassified to a classification of 2 (Ground).
    • 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 format. 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 of 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 to 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: 2013-06-11

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