Sediment Accretion Rates and Spatial Patterns in the Wax Lake Delta, LA 2020

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DOI: https://doi.org/10.5069/G99W0CP6
OT Collection ID: OT.072022.6344.1
OT Collection Name: Sediment Accretion Rates and Spatial Patterns in the Wax Lake Delta, LA 2020
Short Name: LA20_Nghiem
Collection Platform: Airborne Lidar
Metadata Download:
  • ISO 19115 (Data)
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    Point Cloud Data   Bulk Download     opentopoID: OTLAS.072022.6344.1

    Raster Data   Bulk Download     opentopoID: OTSDEM.072022.6344.1
    Collection Overview: NCALM logo

    Rising sea levels and an increasing frequency of storm events has put deltas worldwide at risk. However, sediment deposition from fluvial sources can build land in deltas and counteract this modern trend of land loss. Understanding sediment transport and deposition patterns in coastal deltas thus represents a promising approach to maximizing their future survival. This lidar dataset was collected as part of an NCALM Seed grant for Justin Nghiem at the California Institute of Technology to help understand modern coastal sediment accretion rates and spatial patterns in the Wax Lake Delta, LA. The study area is located southwest of Morgan City, LA and covers approximately 53 km2.

    Note about point classifications: Ground classification was done using a morphological filter in Terrascan and points included in class 2. Bathymetry points classification was done on returns from green laser i.e. channel 3 over the waterbody. Due to the characteristics of the water body (murky water, dark bottom), it cannot be ascertained with 100% certainty that the laser returns from shots of green channel that penetrated the water column, are from the bottom. The lowest returns were classified as the bathymetry points (class 40) as they have the highest probability of representing the water body bottom. All the other green channel points (channel 3) over the water body were classified separately in class 9 as water points. The points over the water surface from the IR laser channels (channel 2 and 3) were classified in class 41 as water surface. Class 1 includes the unclassified points from Channels 1,2 and 3.


    Therefore, point classifications are as follows:
    • 1: Unclassified - all channels
    • 2: Ground - all channels
    • 9: Water - from channel 3 (green)
    • 40: Bathymetric Points - channel 3 (green)
    • 41: Water Surface Points - channel 2 and 3 (IR channels)


    Dataset Acknowledgement: Lidar data acquisition and processing completed by the National Center for Airborne Laser Mapping (NCALM). NCALM funding provided by NSF's Division of Earth Sciences, Instrumentation and Facilities Program. EAR-1830734

    Dataset Citation: Nghiem, J. (2022). Sediment Accretion Rates and Spatial Patterns in the Wax Lake Delta, LA 2020. National Center for Airborne Laser Mapping (NCALM). Distributed by OpenTopography. https://doi.org/10.5069/G99W0CP6. Accessed: 2022-12-02

    Use License: CC BY 4.0

    Dataset Keywords: delta, sediment, accretion, coastal erosion,deposition

    Survey Date: 11/06/2020

    Publication Date: 08/08/2022
    Data Provider and Roles:
    Funder Collector Principal Investigator
    • Justin Nghiem - California Institute of Technology
    Total number of points: 1,014,124,485 pts

    Area: 52.71 km2

    Point Density: 19.24 pts/m2

    Classifications:
        Class 1 - Unclassified485,303,881
        Class 2 - Ground133,108,815
        Class 9 - Water119,953,562
        Class 40 - Reserved66,343,036
        Class 41 - Reserved209,415,191

    Raster Resolution: 1.0 meter

    Coordinate System:
        Horizontal: NAD83 (2011) UTM Zone 15N [EPSG: 6344]
        Vertical: NAVD88 (GEOID18) [EPSG: 5703]

    Units: meter

    Survey Report: LA20_Nghiem_metadata.pdf

    LAS Validation Data Report: Reports
    Tile index in shapefile format: Download

    Dataset Extent in KMZ format: Download

    Dataset Spatial Bounds: North: 29.520495545525°     South: 29.4505387540085°     East: -91.4031888105067°     West: -91.4988467806656°