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Waterlines delimiting the edge of the Hunga Tonga - Hunga Ha'apai island between April 2017 and April 2022 (NERC Grant NE/X002454/1)

Waterlines have been extracted to delimit the edge of the Hunga Tonga - Hunga Ha'apai island between April 2017 and April 2022. Waterline is defined as the instantaneous land - water boundary at the time of the imaging process. Waterlines have been generated by BGS - Earth Observation team through a thresholding-based classification based on Sentinel-2 multispectral imagery and developed on Google Earth Engine. Specifically, the thresholding has been applied to the Normalized Difference Water Index (NDWI) has been derived as a basis to discriminate between the land and sea based on their spectral characteristics. Changes in waterlines over volcanic islands can provide key information to understand volcanic processes. For more info on the methodology, see Novellino et al. (2020) https://doi.org/10.3390/app10020536

Default

Identification info

Metadata Language
English (en)
Dataset Reference Date ()
2022-11-24
Identifier

http://data.bgs.ac.uk/id/dataHolding/13608017

 

British Geological Survey

-

Enquiries


Environmental Science Centre, Nicker Hill, Keyworth

,

NOTTINGHAM

,

NOTTINGHAMSHIRE

,

NG12 5GG

,

United Kingdom

0115 936 3143
0115 936 3276
 

British Geological Survey

-

Enquiries


Environmental Science Centre, Nicker Hill, Keyworth

,

NOTTINGHAM

,

NOTTINGHAMSHIRE

,

NG12 5GG

,

United Kingdom

0115 936 3143
0115 936 3276
 

British Geological Survey

-

Enquiries


 

British Geological Survey

-

Enquiries


Maintenance and update frequency
notApplicable
GEMET - INSPIRE themes
  • Geology
BGS Thesaurus of Geosciences
  • Imagery

  • Volcanic activity

  • Satellite imagery

Keywords
  • NERC_DDC

Limitations on Public Access
otherRestrictions
Other constraints
licenceOGL
Other constraints
Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
Use constraints
otherRestrictions
Other constraints

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints

Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Spatial representation type
vector
Topic category
  • Geoscientific information
Extent

TO

Dataset Reference Date ()
2009

Extent

TON

Dataset Reference Date ()
2009

Extent

TONGA [id=936000]

Dataset Reference Date ()
1979

N
S
E
W


Begin date
2017-04-01
End date
2022-04-30
 

Spatial Reference System

No information provided.

Distribution Information

Data format
  • Shapefile

    ()

Resource Locator
Data
Resource Locator
Data
 
Quality Scope
dataset
Other

dataset

Report

Dataset Reference Date ()
2011
Explanation

See the referenced specification

Degree

Report

Dataset Reference Date ()
2010-12-08
Explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Degree
Statement

The Sentinel-2 images used as input to the workflow comprised Level-1C image products. These are composed of 100 × 100 km2 tiles that are ortho-images in cartographic geometry according to the UTM/WGS84 projection, with radiometric corrections applied to convert each pixel value from the digital number (DN) to Top of Atmosphere (TOA) reflectance. We use median values within a month period, pending availability of the data due to cloud coverage. The remaining images have been thresholded based on the Normalized Difference Water Index (NDWI) is used to as a basis to discriminate between the land and sea based on their spectral characteristics. Methodology is described in detail in Novellino et al., (2021) at https://doi.org/10.3390/app10020536

Metadata

File identifier
f287da43-4913-77ff-e053-0937940a0d43 XML
Metadata Language
English (en)
Resource type
dataset
Metadata Date
2023-01-23
Metadata standard name
UK GEMINI
Metadata standard version

2.3

 

British Geological Survey


Environmental Science Centre,Keyworth

,

NOTTINGHAM

,

NOTTINGHAMSHIRE

,

NG12 5GG

,

United Kingdom

+44 115 936 3100
 
 

Overviews

N
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E
W



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