• Fire Island National Seashore Side-scan Sonar Data, 2015

    Metadata Updated: March 17, 2021

    This dataset presents the processed sidescan mosaic for Fire Island National Seashore. The acoustic sonar survey was conducted using a EdgeTech 6205, a Multi-Phase Echo sounder system. This combined bathymetry and dual-frequency sidescan sonar system is optimized for shallow water surveying. The sonar system was bow-mounted to a 28-ft pontoon survey vessel customized for shallow water surveying, including having a draft of less than one foot. Data was collected using GeoDas software developed by Ocean Imaging Consultants (OIC) and monitored topside in real-time to ensure quality of data and full-coverage sidescan was being achieved. The data were collected in association with an Applanix POS MV system to assure positional accuracy and to correct for vessel motion (pitch, roll, heave). The survey was designed to acquire full-coverage sidescan data and partial coverage bathymetry data. As such, the survey was composed of parallel track lines with line spacing of 35 to 50 m and a sonar swath range of 50 m (25 m per side) to ensure overlap with adjacent lines. The raw sidescan and bathymetry records were processed using OIC CleanSweep software (Version 3.8.0, Build #263). All of the acoustic data were examined manually to confirm quality and accuracy. For sidescan, processing followed standard techniques of bottom-tracking the data and then applying angle-varying gains (AVG) and look-up tables (LUT) as necessary to correct for water column returns, arrival angle, and contrast to produce color-balanced sidescan sonar images. The native images are displayed as an inverse gold color scale, with pixel values ranging from zero (dark gold) to 255 (white). The lighter pixels indicate hard acoustic returns and represent the presence of hard surficial sediments (e.g. coarse sand, cobbles, and boulders), whereas darker pixels represent the presence of soft sediments, which tend to absorb sound to a greater degree. The horizontal coordinate system was set to UTM Zone 18N and sidescan data was processed to 25cm pixel resolution.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided.

    Downloads & Resources

    References

    https://www.nps.gov/im/ncbn/contactus.htm
    https://irma.nps.gov/DataStore/Reference/Profile/2278061

    Dates

    Metadata Created Date March 17, 2021
    Metadata Updated Date March 17, 2021

    Metadata Source

    Harvested from NPS-Harvest - NRSS Data Store

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date March 17, 2021
    Metadata Updated Date March 17, 2021
    Publisher National Park Service
    Unique Identifier Unknown
    Maintainer
    Identifier NPS_DataStore_2278061
    Data First Published 2017-04-19
    Data Last Modified 2017-04-19
    Category Geospatial Dataset
    Public Access Level public
    Bureau Code 010:24
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID D:\IRMA\DataStore\Application\OpenData\v1.1\NPS-DataStore.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Data Quality True
    Harvest Object Id 78287b1b-4e6c-4c5b-800b-42fb87016751
    Harvest Source Id a73e9b95-126c-4791-a8f2-46fc064cdc62
    Harvest Source Title NPS-Harvest - NRSS Data Store
    Homepage URL https://irma.nps.gov/DataStore/Reference/Profile/2278061
    Program Code 010:118, 010:119
    Related Documents https://www.nps.gov/im/ncbn/contactus.htm, https://irma.nps.gov/DataStore/Reference/Profile/2278061
    Source Datajson Identifier True
    Source Hash efe7be850c3840da56719597e73d27607f22db36
    Source Schema Version 1.1
    Spatial -73.23551,40.62486,-72.7532,40.7806244
    Temporal 2014-01-01/2015-01-01

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