Data (Creazione)

2017

Data (Pubblicazione)

2019

Identificatore

https://doi.org/10.1080/17445647.2019.1567401

Data (Pubblicazione)

2019-02-20

Altri dettagli

How to cite this data: Sara Innangi, Gabriella Di Martino, Claudia Romagnoli & Renato Tonielli (2019): Seabed classification around Lampione islet, Pelagie Islands Marine Protected area, Sicily Channel, Mediterranean Sea, Journal of Maps. DOI:10.1080/17445647.2019.1567401

Identificatore

http://libeccio.bo.ismar.cnr.it:8080/geonetwork/srv/eng/catalog.search#/metadata/d99eeec4-4cb1-4c8e-b7a0-3735b008792c

Data (Pubblicazione)

2024-11-18

Crediti

© CNR-ISMAR

Status

Completato

Frequenza di aggiornamento

Secondo necessità

GEMET - INSPIRE themes, version 1.0

• Geology

Continents, countries, sea regions of the world.

• Mediterranean Sea
• Strait of Sicily
• Italy

Platform Type

• research vessel

Survey type

• Geophysics
• Cartography

Collection method

• Sonar system

Device

• Multibeam

Swath type

• Bathymetry

Parole chiave

• lampione island
• pelagie islands
• nbfc

Limitazione d’uso

Do not use for navigation

Vincoli di fruibilità

Licenza

Altri vincoli

CC BY NC 4.0

Vincoli di accesso

Licenza

Altri vincoli

CC BY NC 4.0

Classificazione

Non riservato

Tipo di rappresentazione spaziale

Dati raster

Lingua dei metadati

English

Set dei caratteri dei metadati

UTF8

Tema

• Quote e prodotti derivati
• Informazioni geoscientifiche

Informazioni supplementari

none

Identificatore del sistema di riferimento

EPSG:32633 - WGS 84 / UTM zone 33N

Livello di topologia

Solo Geometria

Oggetto di tipo geometrico

Superficie

Conteggio oggetto geometrico

1

Formato di distribuzione

• GeoTIFF ( .tif )

Risorsa online

Scientific paper ( DOI )

Innangi et al, 2019

Livello

Modello

Dataset

Bathymetric surface

Genealogia del dato – Processo di produzione

Geophysical data were collected by the Institute for Coastal Marine Environment (IAMC, now ISMAR, Institute of Marine sciences) of the National Research Council (CNR) of Naples (Italy) during the oceanographic survey ‘BioGeoLin 2017’ (8–20 September 2017), onboard the R/V Minerva UNO (Di Martino et al., 2017). Multibeam bathymetric survey were carried out around Lampione Islet from 15 m to 75 m of depth, obtaining the whole coverage of shallow-water areas, also outside the boundaries of the MPA. The survey was performed using a polemounted Teledyne Reson SeaBat 7125 400 kHz MBES (Innangi et al., 2018), providing sub-centimetric resolution in the bathymetric data at that depth range (grid 1 × 1 m). The vessel was equipped with an Omnistar Differential Global Positioning System (DGPS) and an IxSea Octans 3000 that provided positioning data (with sub-meter accuracy) and attitude data (0.01° accuracy) to the navigation software. A Valeport mini-SVS sound velocity probe was installed near the transducer, thus providing the real-time surficial sound speed for the beam steering, and a sound velocity profiler was systematically lowered through the water column to get the velocity profile required for depth computation. The Teledyne PDS 4.1 software was used for logging and processing MBES bathymetric data. Data de-spiking was carried out manually without the application of automatic filters in order to preserve data accuracy and resolution. The Teledyne Reson 7125 MBES is also able to collect backscatter intensity (the measurement of sound scattered back toward the transmitter by acoustic reflection and scattering) as Snippet data (De Falco et al., 2010; Innangi et al., 2015; Lurton et al., 2015; Parnum & Gavrilov, 2011). Snippet data processing was carried out using FMGeocoder Toolbox (FMGT) in Fledermaus 7.6 version (QPS, 2016). These data were corrected for receiver gain, transmit power, transmit pulse width, spherical spreading, attenuation in the water column, area of ensonification, beam pattern, speckle noise and, finally and most importantly, for angular dependence and local slope (Mallace, 2012; QPS, 2016). The final mosaic was exported as a geo-referenced TIFF image with a 1 m pixel size and imaged using a gray scale in which the higher backscatter values correspond to darker areas. A range of signal values in relative (dB) units ranging from −60 dB (lighter tones, corresponding to low backscatter) to −25 dB (dark gray tones, considered as high backscatter) was adopted in the maps. The MBES used for this study was not calibrated to obtain absolute backscatter levels. Consequently, backscatter data presented cannot be compared with absolute values reported in other studies, as in De Falco et al. (2010), but this kind of data is used in a relative way for semi-automated acoustic seabed classification, being locally calibrated with groundtruth information.

Dati di origine

Identificatore del file di metadati

d99eeec4-4cb1-4c8e-b7a0-3735b008792c XML

Lingua dei metadati

English

Set dei caratteri dei metadati

UTF8

Livello gerarchico

Modello

Nome del livello gerarchico

Bathymetric surface

Data dei metadati

2024-11-28T14:09:58

Nome dello Standard dei metadati

ISO 19115:2003/19139

Versione dello Standard dei metadati

1.0