Date (Creation)

2020-07-21T12:13:30

Citation identifier

https://geoservice.dlr.de/catalogue/srv/metadata/74539266-4a28-4148-b252-a9b3e4c8720b

Presentation form

Digital map

Other citation details

DOI: 10.15489/9jhr18jepi65

Purpose

The main objective of the TanDEM-X PolarDEM project is to provide derivatives of the global Digital Elevation Model (DEM) of the TanDEM-X mission for Polar Regions.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
German Aerospace Center (DLR)		td-polardem@dlr.de polardem@dlr.de	Point of contact
German Aerospace Center (DLR)		geoservice@dlr.de	Distributor
German Aerospace Center (DLR)	Birgit Wessel	birgit.wessel@dlr.de	Author
German Aerospace Center (DLR)	Martin Huber	martin.huber@dlr.de	Author

Maintenance and update frequency

As needed

Keywords

• TanDEM-X

• Digital Elevation Model

• TDX-1

• TSX-1

• SAR

• X-Band

• PolarDEM

• Antarctica

• inspireidentifiziert

GEMET - INSPIRE themes, version 1.0

• Höhe

Spatial scope

• Global

Use limitation

Nutzungseinschränkungen: Das DLR ist nicht haftbar für Schäden, die sich aus der Nutzung ergeben. / Use Limitations: DLR not liable for damage resulting from use.

Access constraints

Other restrictions

Other constraints

Öffentlicher Zugriff beschränkt entsprechend Artikel 13(1)(e) der INSPIRE-Richtlinie: e) aufgrund nachteiliger Auswirkungen auf die Rechte des geistigen Eigentums

Use constraints

Other restrictions

Other constraints

License: https://geoservice.dlr.de/resources/licenses/polardem90/TanDEM-X-PolarDEM_User_Licence.pdf

Spatial representation type

Grid

Denominator

180000

Language

Deutsch

Character set

UTF8

Topic category

• Elevation

Begin date

2013-04-29T04:28:28

End date

2017-09-07T08:24:10

Unique resource identifier

EPSG:3031

Number of dimensions

3

Dimension name

Column

Dimension size

61109

Resolution

90  m

Dimension name

Row

Dimension size

54789

Resolution

90  m

Dimension name

Vertical

Dimension size

1

Resolution

1  m

Cell geometry

Area

Transformation parameter availability

No

Distribution format

Name	Version
GeoTIFF

OnLine resource

Protocol	Linkage	Name
WWW:DOWNLOAD-1.0-http--download	https://download.geoservice.dlr.de/TDM_POLARDEM90/files/ANTARCTICA/
WWW:LINK-1.0-http--link	https://download.geoservice.dlr.de/TDM_POLARDEM90/ANTARCTICA/	EOC Download Service
WWW:LINK-1.0-http--link	https://tandemx-science.dlr.de/	TanDEM-X DEM access - scientific users
WWW:LINK-1.0-http--link	https://www.intelligence-airbusds.com/	TanDEM-X DEM access - non-scientific users
WWW:LINK-1.0-http--link	https://geoservice.dlr.de/web/dataguide/tdm90/	TDM90 - EOC Geoservice Data Guide
WWW:LINK-1.0-http--link	https://geoservice.dlr.de/web/maps/tdm:polardem90:antarctica	EOC Geoservice Map Context
OGC:WMS	https://geoservice.dlr.de/eoc/elevation/wms?	TDM_POLARDEM90_ANT_DEM
OGC:WMS	https://geoservice.dlr.de/eoc/elevation/wms?	TDM_POLARDEM90_ANT_HSC
OGC:WMS	https://geoservice.dlr.de/eoc/elevation/wms?	TDM_POLARDEM90_ANT_HSM
OGC:WMS-http-get-capabilities	https://geoservice.dlr.de/eoc/elevation/wms?SERVICE=WMS&REQUEST=GetCapabilities

Hierarchy level

Dataset

Statement

The PolarDEM is a derivative of the global TanDEM-X product provided by the TanDEM-X mission. The production steps comprised the following steps:

- gaps in the global TanDEM-X DEM are filled using additional TanDEM-X acquisitions where possible

- the editing process comprises a smoothing of noisy areas, the removal of voids and a replacement of frozen and partially open sea-ice areas with geoid undulations. A semi-automatic approach for coastline delineation was developed and applied to identify the water areas and assign homogeneous height values.

- the editing and gap filling was applied to the TanDEM-X DEM products in their original spacing in geographic coordinates. The TanDEM-X PolarDEM is finally transformed into a polar stereographic projection with a homogeneous metric spacing in northing and easting.

For more information concerning the TanDEM-X PolarDEM product, the reader is referred to

https://www.dlr.de/eoc/en/desktopdefault.aspx/tabid-11882/20871_read-66374/

and:

Wessel, B., Huber, M., Wohlfart, C., Bertram, A., Osterkamp, N., Marschalk, U., Gruber, A., Reuß, F., Abdullahi, S., Georg, I., and Roth, A.: TanDEM-X PolarDEM 90 m of Antarctica: Generation and error characterization, The Cryosphere Discuss. [preprint], https://doi.org/10.5194/tc-2021-19, in review, 2021.

Description

TanDEM-X PolarDEM Processing:

Data:

The PolarDEM is based on the global TanDEM-X DEM and additional TanDEM-X acquisitions which are used for gap filling. Geoid undulations from the Earth Gravitational Model 2008 (EGM2008) are used to replace open sea elevations.

Processing:

DEM gap filling is performed with additional TanDEM-X acquisitions utilizing the Mosaicking and Calibration Processor (MCP) of the TanDEM-X mission. Water body detection, flattening, smoothing and interpolation of outliers and voids is performed within the editing process. The resulting DEM is transformed into a stereographic projection with a homogeneous metric spacing in northing and easting.

Quality Assurance:

An interactive quality control of the DEM gap filling as well as the PolarDEM generation is performed. The resulting PolarDEM is e.g. compared to the global TanDEM-X DEM.

Metadata

File identifier

74539266-4a28-4148-b252-a9b3e4c8720b XML

Metadata language

Deutsch

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2023-01-25T09:33:36

Metadata standard name

ISO 19115-1:2014/19139

Metadata standard version

1.0

Metadata author

Organisation name	Individual name	Electronic mail address	Role
German Aerospace Center (DLR)		geoservice@dlr.de	Point of contact