Eredar measurements of Halema'uma'u lava lake level (NERC Grant NE/N009312/1)

Surface level measurements of the Halema'uma'u lava lake, Hawaii. Surface level was measured from a site at the crater rim (19.40452 N 155.27944 W 1125 M a.s.l) using the Eredar radar system, a ground-based X-band FMCW radar (described in detail here: https://doi.org/10.1029/2018GL079177). Due to technical problems, the radar did not acquire continuously throughout its deployment. The dataset contains three blocks of successful continuous measurement periods (all times in UTC): 10 Jan 22:18 -> 11 Jan 08:46 11 Jan 21:24 -> 12 Jan 22:49 14 Jan 20:27 -> 14 Jan 23:01 Measurements were taken at a rate of ~1 Hz, using a 20 ms 400 MHz bandwidth Linear Frequency Modulated chirp centred at 10.25 GHz.

Date (Creation): 2021-06-02

Identifier: http://data.bgs.ac.uk/id/dataHolding/13607770

Principal investigator

University of Cambridge - Oppenheimer, Clive

United Kingdom

Originator

University College London - Nial Peters

Department of Electronic and Electrical Engineering, Torrington Place , London , WC1E 7JE ,

Distributor

British Geological Survey - Enquiries

Point of contact

British Geological Survey - Enquiries

Maintenance and update frequency: notApplicable notApplicable

GEMET - INSPIRE themes, version 1.0

Geology

BGS Thesaurus of Geosciences

NGDC Deposited Data
Lavas
Volcanoes
Radar

dataCentre

NGDC Deposited Data

Keywords

NERC_DDC

Access constraints: otherRestrictions Other restrictions

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 restrictions

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]"

Metadata language: EnglishEnglish

Topic category

Geoscientific information

Begin date: 2018-01-10

End date: 2018-01-14

Reference System Information

No information provided.

Distribution format

csv ()

Distributor

British Geological Survey - Enquiries

OnLine resource: Data

Hierarchy level: nonGeographicDataset Non geographic dataset

Other: non geographic dataset

Conformance result

Date (Publication): 2011

Explanation: See the referenced specification

Pass: No

Conformance result

Date (Publication): 2010-12-08

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

Pass: No

Statement: Raw radar returns have been converted to range using standard FMCW processing. The width of the radar beam (3 degrees) coupled with the oblique viewing angle (antennas at -36.5 degrees from horizontal) results in a broad return spanning many range cells from the surface of the lake. A Gaussian fit has been made to this return, and the range to the lake taken as the range of the peak of the Gaussian. Ranges have been corrected for viewing geometry and converted to height above sea level based on the altitude of the radar system which was measured using a handheld GPS. The rapidly changing surface texture of the lake has resulted in considerable scatter in the Gaussian fit and therefore calculated height of the lake. A moving average (we recommend a window size of ~50 samples) can be used to reduce this and resolve fluctuations in lake level.