TanDEM-X - DEM Change Maps (DCM) - Global, 30m

The TanDEM-X DEM Change Maps is a project developed by the Institute Remote Sensing Technology (IMF) at the German Aerospace Center (DLR) within the activities of the TanDEM-X Mission.

Between 2016 and 2022, the TanDEM-X mission acquired an additional complete coverage of the Earth's landmass to deliver a temporally independent coverage within a well-defined time span. These new acquisitions not only provide more up-to-date elevation information, but also a great dataset to show the changes that have occurred during the years separating this new coverage from the coverages acquired to generate the TanDEM-X global DEM (between 2011 and 2014). This product - the TanDEM-X 30 m DEM Change Maps - shows the changes between the edited first global TanDEM-X DEM (TanDEM-X 30m Edited DEM) and the newly acquired time-tagged DEM scenes. In order to keep a unique timestamp, two change maps are available per tile: one with the change to the oldest pixel in the new dataset - the first DEM change, and another with the change to the newest pixel of the new dataset - the last DEM change. The two maps differ only when there are multiple coverages.

Users must be aware that a given elevation change measured in the DEM change maps corresponds to a topographic change with respect to TanDEM-X 30m EDEM, but cannot be associated with a corresponding physical height change of the same magnitude. This is due to the fact that the global TanDEM-X DEM reflects an averaged elevation derived from the combination of different images, acquired over a period of several years but also because the radar waves penetrate differently in the surface depending on the attributes of the land cover. This is especially important over vegetated and snow-covered regions.

Citation proposal
. TanDEM-X - DEM Change Maps (DCM) - Global, 30m. https://gdk.gdi-de.org/geonetwork/srv/api/records/3427bcdb-837f-4269-ab62-93b6864b2865

INSPIRE
SDS

INSPIRE

Identification

File identifier: 3427bcdb-837f-4269-ab62-93b6864b2865 XML

Hierarchy level: Dataset

Online resource

Protocol: WWW:LINK-1.0-http--link

Protocol: WWW:LINK-1.0-http--link

Protocol: WWW:LINK-1.0-http--link

Protocol: WWW:LINK-1.0-http--link

Protocol: OGC:WMS

Protocol: OGC:WMS

Protocol: OGC:WMS

Protocol: OGC:WMS

Protocol: OGC:WMS

Protocol: OGC:WMS

Protocol: OGC:WMS

Protocol: OGC:WMS

Protocol: WWW:LINK-1.0-http--link

Resource identifier

code: https://geoservice.dlr.de/catalogue/srv/metadata/3427bcdb-837f-4269-ab62-93b6864b2865

Metadata language: German

Spatial representation type: Grid

Encoding

Format: GeoTIFF

Projection

Classification of data and services

Topic category

Elevation

Classification of data and services

Coupled resource

Classification of data and services

Coupled resource

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )

Elevation

Spatial scope ( Place )

Global

Other keywords

Keywords

DLR
IMF
EOC
TanDEM-X
DEM Change Maps
Change
Change Detection
Digital Elevation Model
TDM 30m DCM
TanDEM-X 4D
TDX-1
TSX-1
Global
inspireidentifiziert

Geographic coverage

Temporal reference

Temporal extent

Date ( Creation ): 2023-11-17T10:00:00

Quality and validity

Lineage: For operational TanDEM-X acquisitions single DEM scenes with an extend of ~30km x 50km are generated by applying bistatic focusing, processing of individual interferograms, phase unwrapping and geocoding. The in-house edited DEMs are used to ease phase unwrapping and pre-calibrate the scenes.