Date (Creation)

2020-06-03

Date (Revision)

2020-06-03

Date (Publication)

2020-06-03

Date (released)

2020-06-03

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/6909792b-fadf-4de6-ac2a-d32fa76a8339

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01335

Codespace

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

Other citation details

Please cite this item as: Jordan, T., & Robinson, C. (2022). Rectified airborne Lidar data over Thwaites Glacier catchment between 1st January and 30th December 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/6909792b-fadf-4de6-ac2a-d32fa76a8339

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Jordan, Tom		Author
British Antarctic Survey	Robinson, Carl		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 > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
• EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets
• EARTH SCIENCE > Land Surface > Topography
• EARTH SCIENCE > Spectral/Engineering > Lidar

Theme

• ITGC

• Ice surface

• Lidar

• Surface elevation

• Thwaites

• West Antarctica

Place

• Thwaites Glacier Antarctica

• Dotson Ice Shelf Antarctica

• Crosson Ice Shelf Antarctica

GEMET - INSPIRE themes, version 1.0

• Elevation
• Land cover

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

Further by downloading this data the user acknowledges that they agree with the NERC data policy (), and the following conditions:

1. To cite the data in any publication as follows:

DATA REFERENCE

Jordan, T., & Robinson, C. (2022). Rectified airborne Lidar data over Thwaites Glacier catchment between 1st January and 30th December 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/6909792B-FADF-4DE6-AC2A-D32FA76A8339

2. The user recognizes the limitations of data. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data.

Use constraints

Other restrictions

Other constraints

None

Unique resource identifier

url

Codespace

url

Association Type

dependency

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Spatial representation type

Text, table

Language

English

Character set

UTF8

Topic category

• Elevation
• Geoscientific information
• Imagery base maps earth cover

Begin date

2019-01-26

End date

2019-12-30

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:

Lidar data was collected using a Riegl Q240i-80 scanning system mounted in the camera bay of the BAS geophysically equipped twin otter. Coincident attitude data was collected using an iMAR inertial navigation system (INS) (from Lamont Doherty Earth Observatory for the Jan 2019 season, and from BAS for the December 2019 season). Data processing was carried out by a sub-contractor (Terratec - https://terratec.no/en/). For each season (January and December) a boresight calibration was carried out using the Terrasolid software modules Terramatch and Terrascan. This calibration utilised a specific calibration data-set collected over the BAS Rothera Research Station. After calculation of the boresight values the remaining data for each season were processed using Riprocess with the appropriate boresight values. During the main survey data was collected on as many flights as possible, but due to operational constraints Lidar data is not available on all flights. As Lidar was not a priority, swaths do not typically overlap, so further calibration in the main survey area was not possible. The generally feature poor ice surface would also hamper such calibration. In addition it must be noted that removal of spikes due to clouds or other atmospheric returns has not been carried out. However, most flights were flown in clear weather.

The list of variables is as follows:

* longitude x - in degrees from the WGS84 datum

* latitude y - in degrees from the WGS84 datum

* altitude z - in meters

* intensity - arbitrary value between -128/128

* scan_angle - in degrees

* GPS_time

* datetime_utc - converted GPS time to UTC taking into account leap seconds in YYYY-MM-DD HH:MM:SS

Data quality:

Analysis of repeat passes over the Runway suggests the corrected data has an internal accuracy of ~10 cm.

Note no de-spiking, or removal of cloud features has been undertaken.

Metadata

File identifier

6909792b-fadf-4de6-ac2a-d32fa76a8339 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2020-06-03

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