Date (Creation)

2024-10-08

Date (Revision)

2024-10-08

Date (Publication)

2024-10-08

Date (released)

2024-10-08

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/fcd80bf1-bd69-4054-826c-a4727af8096a

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01918

Codespace

https://data.bas.ac.uk/

Unique resource identifier

NE/S006710/1

Codespace

award

Unique resource identifier

NE/S006753/1

Codespace

award

Unique resource identifier

NE/K012088/1

Codespace

award

Other citation details

Please cite this item as: Adams, J., Johnson, J., Roberts, S., Mason, P., Rood, D., & Ramsay, R. (2024). Laboratory spectral reflectance measurements at VNIR-SWIR wavelengths of 17 rock samples from Mount Murphy, West Antarctica (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/fcd80bf1-bd69-4054-826c-a4727af8096a

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Adams, Jonathan		Author
British Antarctic Survey	Johnson, Joanne		Author
British Antarctic Survey	Roberts, Stephen J.		Author
Imperial College London	Mason, Philippa J.		Author
Imperial College London	Rood, Dylan H.		Author
Field Spectroscopy Facility, University of Edinburgh	Ramsay, Robbie		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency

As needed

Maintenance note

Completed

Global Change Master Directory (GCMD) Science Keywords

• EARTH SCIENCE > Spectral/Engineering > Infrared Wavelengths > Reflected Infrared
• EARTH SCIENCE > Solid Earth > Rocks/Minerals

Theme

• Amundsen Sea Embayment

• Mount Murphy

• Spectral reflectance

• West Antarctica

• geologic mapping

Place

• Mount Murphy Antarctica

• Pope Glacier Antarctica

• Kay Peak Antarctica

GEMET - INSPIRE themes, version 1.0

• Geology

Access constraints

Other restrictions

Other constraints

no limitations to public access

Access constraints

Other restrictions

Other constraints

no limitations

Use constraints

License

Other constraints

Open Government Licence v3.0

Use constraints

Other restrictions

Other constraints

This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/

Use constraints

Other restrictions

Other constraints

This data is governed by the NERC data policy and supplied under Open Government Licence v.3

Use constraints

Other restrictions

Other constraints

No restrictions apply.

Unique resource identifier

url

Codespace

url

Association Type

Larger work citation

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Unique resource identifier

url

Codespace

url

Association Type

Larger work citation

Spatial representation type

Text, table

Language

English

Character set

UTF8

Topic category

• Geoscientific information

Begin date

1990-11-20

End date

1992-12-14

Supplemental Information

It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title

European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication)

2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier

urn:ogc:def:crs:EPSG::3031

Version

6.18.3

Hierarchy level

Dataset

Statement

Methodology:

Rock samples from which spectral reflectance measurements were obtained were collected on expeditions to Mt Murphy in the 2015-16, and 1990-91 field seasons as part of the ANiSEED and SPRITE projects. Most samples were collected during the more recent ANiSEED field season by Dr. Joanne Johnson and Dr. Stephen Roberts. The position of each sample was recorded using a Trimble 5700 GPS receiver set at the same height as the sample's upper surface. Sample reflectance spectra were measured using a Spectral Evolution PSR 3500+ spectroradiometer by Dr. Jonathan Adams in a dark optical calibration laboratory at the NERC (Natural Environment Research Council) Field Spectroscopy Facility (FSF). Measurements were taken using a contact probe attachment with a stabilized quartz-tungsten-halogen lamp. The effective spot sampling size was a circle of diameter 1.2 cm. With the contact probe positioned over the sample, the reflected radiance of the illuminated area was measured (Lsample). This radiance was then compared to that of a NIST-traceable calibrated 99% reflectance Spectralon(R) reference panel (Labsphere, USA) (Lreference). A ratio of Lsample to Lreference was taken to arrive at a relative reflectance value. The absolute reflectance value, rho-sample, was determined by correcting the relative reflectance value with the calibration coefficients of the reference panel. Post-processing of laboratory spectra was performed using SpectraGryph - optical spectroscopy software Version 1.2, and Python 3 - Jupyter Notebook. Spectral measurements from difference parts of a sample surface were compared to investigate the spectral profiles of weathered and fresh surfaces. A representative average reflectance value for each sample was calculated, generating 17 reflectance profiles which were compiled into a new spectral library for Mt Murphy. The original orientation of each sample had been documented in the field permitting generation of 17 averaged reflectance profiles from the top of each sample. These data were used to validate satellite-based spectral mapping observations and are included as a separate .csv file. Equipment setup, training and support for the spectral measurements was provided by Dr. Robbie Ramsay (FSF).

Data collection:

Trimble 5700 GPS receiver

Spectral Evolution PSR 3500+ spectroradiometer (Spectral Evolution, USA)

Spectralon(R) reference panel, 99% (Labsphere, USA)

Software:

SpectraGryph - optical spectroscopy software Version 1.2

Python 3 - Jupyter Notebook

Data quality:

Reflectance spectra were acquired over the 0.35 - 2.5 um spectral range. The spectral interval and average resolution of the instrument were, respectively, 1.5 nm and 3.0 nm between 350 nm - 1000 nm; 3.8 nm and 10.0 nm between 1000 nm - 1890 nm; 2.5 nm and 8.0 nm between 1890 nm - 2500 nm. All reflectance values are interpolated to a 1 nm interval using cubic-spline interpolation. Radiance measurements of the illuminated sample were compared to radiance measurements of an illuminated reference panel, and ratioed to arrive at a reflectance value. The Spectralon(R) reference panel was post calibrated at FSF to NIST traceable standards. Calibration data is provided as a separate .csv file.

Metadata

File identifier

fcd80bf1-bd69-4054-826c-a4727af8096a XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2024-10-08

Metadata standard name

ISO 19115 Geographic Information - Metadata

Metadata standard version

ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact