Date (Creation)

2019-05-29

Date (Revision)

2019-05-29

Date (Publication)

2019-05-29

Date (released)

2019-05-29

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/29bf1c9f-a39a-452c-b9f9-de35d9fb9179

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01151

Codespace

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

Other citation details

Please cite this item as: Cunliffe, A., Myers-Smith, I., Kerby, J., & Palmer, W. (2019). Orthomosaic of permafrost landscape on Qikiqtaruk - Hershel Island, Yukon, Canada (August 2017) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/29bf1c9f-a39a-452c-b9f9-de35d9fb9179

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
School of GeoSciences, University of Edinburgh	Cunliffe, Andrew		Author
University of Edinburgh	Myers-Smith, Isla		Author
Neukom Institute for Computational Science, Dartmouth College	Kerby, Jeffrey		Author
Landscapes	Palmer, William		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 > Frozen Ground > Permafrost
• EARTH SCIENCE > Land Surface > Frozen Ground > Permafrost
• EARTH SCIENCE > Land Surface > Landscape

Theme

• Arctic

• Coastline

• Landscape

• Permafrost

Place

• Qikiqtaruk, Herschel Island Arctic

GEMET - INSPIRE themes, version 1.0

• Meteorological geographical features
• 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 both the data and literature references in any publications that use this data.

DATA REFERENCE:

Andrew M. Cunliffe, Isla H. Myers-Smith, Jeffrey T. Kerby and William F. Palmer.(2019):Orthomosaic of permafrost landscape on Qikiqtaruk - Hershel Island, Yukon, Canada (August 2017). UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation.

LITERATURE REFERENCE:

A. Cunliffe*, G. Tanski*, B. Radosavljevic, W. Palmer, T. Sachs, H. Lantuit, J. Kerby, and I. Myers-Smith (2019) Accelerating retreat of permafrost coastline observed by combining long-term observations with aerial drone surveys. The Cryosphere. 13(5):1513-1528. doi:10.5194/tc-13-1513-2019

2. The user recognizes the limitations of data and will not use this data for navigation purposes. 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

Cross reference

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Unique resource identifier

doi

Codespace

doi

Association Type

Cross reference

Spatial representation type

Text, table

Language

English

Character set

UTF8

Topic category

• Geoscientific information

Begin date

2017-08-10

End date

2017-08-11

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:

Drone surveys were conducted using two platforms: (i) a lightweight flyingwing Zeta Phantom FX-61 with a PixHawk flight controller equipped with a Sony RX-100ii camera (100 CMOS sensor with 20.2 megapixels) and (ii) a multi-rotor DJI Phantom 4 Pro (100 CMOS sensor with 20 megapixels). Typical flying altitude was between 100 and 120 m above ground level, yielding ground sampling distances of ca. 20 to 40mm, with image overlap of more than nine photographs across most (90%) of the scene.

Spatial constraint of the orthomosaic was achieved through geotagging of individual camera positions with the UAV location, combined with n=132 black and white ground control markers deployed across the scene and precisely geolocated to an absolute accuracy of approximately 0.02m using real-time kinematic global navigation satellite system (GNSS) equipment (Leica Geosystems).

These photographs were processed using Agisoft PhotoScan (version 1.3.3) ( https://www.agisoft.com/), to a spatial reference system of NAD83 UTM 7N (EPSG: 26907). The following quality settings were used:

Image quality assessment

Minimum quality score ≥0.7

Image alignment

Accuracy: Highest

Generic preselection: Yes

Reference preselection: Yes

Key point limit: 40,000

Tie point limit: 0

Adaptive camera model fitting: No

Tie point filtering

Reprojection error threshold: 0.45

Parameter optimisation:

Enabled parameters: F, Cz, Cy, B1, B2, K1, K2, K3, P1, P2

Fit rolling shutter: No

Dense cloud

Quality: High

Depth filtering: Mild

Orthomosaic

Mapping mode: Orthophoto

Blending mode: Mosaic

Enable colour correction: Yes

Enable hole filling: Yes

For additional information on the production and use of this dataset, please refer to: Rapid retreat of permafrost coastline observed with aerial drone photogrammetry, Cunliffe, A. M., Tanski, G., Radosavljevic, B., Palmer, W. F., Sachs, T., Lantuit, H., Kerby, J. T., and Myers-Smith, I. H.: Rapid retreat of permafrost coastline observed with aerial drone photogrammetry, The Cryosphere, 13, 1513-1528, https://doi.org/10.5194/tc-13-1513-2019, 2019 and also the supplementary information accompanying the article.

Data quality:

There are some small missing areas within the orthomosaic, due to insufficient image overlap of these areas (nodata is indicated by value of 255 in the Red, Green and Blue bands). Some artefacts (distortion) in the orthomosaic are expected around the periphery of the survey area, particularly where (reflective or moving) water is present.

Metadata

File identifier

29bf1c9f-a39a-452c-b9f9-de35d9fb9179 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2019-05-29

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