TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurements) is an Earth observation radar mission that consists of a SAR interferometer built by two almost identical satellites flying in close formation. Cross-track interferometry with typical separations between the satellites of 120m to 500m enables the acquisition of accurate interferograms not impacted by temporal decorrelation and atmospheric disturbances. The primary objective of the mission – the generation of a global Digital Elevation Model (DEM) – was achieved in 2016. The absolute height error is with about 1m an order of magnitude below the 10m specification.
While working on the global DEM, it became clear that Earth’s surface is highly dynamic – changes in the height of glaciers, permafrost areas and forests were to be expected, but changes due to agricultural activities and infrastructure projects also leave clear traces and can be measured. Therefore, in 2017 the decision was made to continue the mission with a focus on topographical changes. To provide easy access to these changes, the following products have been created and are now available.
The TanDEM-X 30m Edited Digital Elevation Model (EDEM) offered here for download is an edited version of the TanDEM-X Global DEM with a 1 arcsec pixel spacing, which corresponds to approximately 30m at the equator. It covers with 150 Mio sqkm all Earth’s landmasses from pole to pole and serves as reference for topographical changes.
The TanDEM-X 30m DEM Change Maps (DCM) are also generated with a 1 arcsec pixel spacing and provide the DEM changes with respect to the EDEM reference for new data acquired since 2016. Since these new data are calibrated over stable areas against the TanDEM-X 30m EDEM, their absolute height accuracy is also in the order of 1m. DCMs are annotated with precise time stamps on a pixel basis to enable multitemporal analyses.
Please check the references [R01], [R02], [R03] in the literature chapter for further details on the TanDEM-X 30m Edited DEM, and [R04], [R05] for further details on the TanDEM-X 30m DEM Change Maps.
|Number of Products
|Size of the global data set, zipped (including all annotations)
|Size of the global data set, unzipped (including all annotations)
|Size of the global data set, unzipped (main raster files only)
|19389 x 2
This information page gives an overview about the basic products specifications of the TanDEM-X 30m Edited DEM and the TanDEM-X 30m DEM Change Maps product, explains how to register, and how to download the TanDEM-X 30m EDEM and DCM data sets, which license terms for the use of the data have to be considered, and comprises basic compatibility issues, which might arise when other global or local height data sets are planned to be compared or to be combined with the TanDEM-X 30m products. At the end of this page suggestions for further readings and literature, a FAQ, tips for software tools, and contact information can be found.
The TanDEM-X 30 EDEM product offered for download is based on the TanDEM-X DEM product in 1 arcsec, whose specification document can be found here:
TanDEM-X DEM Product Specification
The product description of the TanDEM-X 30m EDEM product can be downloaded here:
TanDEM-X 30m Edited DEM Product Description
The main component of the TanDEM-X 30m Edited DEM is an edited version of the 1 arcsec product variant of the TanDEM-X Global DEM product in Version 1.0.
As such it has the following basic characteristics:
The global accuracy goals for the TanDEM-X 12m (0.4 arcsec) DEM products have been defined as follows:
The TanDEM-X 30m Edited DEM product is delivered in a compressed ZIP (*zip) format. Each zip file contains a main folder, which contains basically the meta data of the product in XML (*.xml) format. In the main folder there are 4 subfolders:
The 2 DEM files as well as the layers are in a GeoTIFF (*.tif) raster format, but with different bit depths. Finally, the meta data file includes various parameters, which were used to generate the product, as well as statistics for the DEM and the editing.
The file naming convention of the TanDEM-X 30m Edited DEM geocells refers to the latitude and
longitude value of the lower left or southwest corner pixel of a product. The prefix string in the file
base name has the general form:
”TDM1_tttt_nn_BbbXxxx” (e.g. TDM1_EDEM_10_N22E040.zip).
The main tif files have a sufix with the general form:
”TDM1_tttt_nn_BbbXxxx_FFFF_CCC.tif” (e.g. TDM1_EDEM_10_N22E040_EDEM_W84.tif)
and the tif Auxfiles as well as preview:
”TDM1_tttt_nn_BbbXxxx_FFF.tif” (e.g. TDM1_EDEM_10_N22E040_EDM.tif)
The meaning of the letter codes is given in following table.
|Product type, i.e. EDEM
|Spacing, 10: original spacing, 1 arcsec grid
10 (1 arcsec, 30m at equator)
|“N” if the center of southwest corner pixel of a tile is on the Equator or north of it. “S” if it is south of the Equator
|2-digit latitude value of the center of the southwest corner pixel of a tile in degrees
|“E” if the center of the southwest corner pixel of a tile is in the eastern hemisphere, “W” otherwise. If the center of the southwest pixel of the tile is exactly at 0° longitude, this is “E”. If the center of the southwest corner pixel is exactly at ±180° longitude, this is “W”.
|3-digit longitude value of the center of the southwest corner of a tile in degrees.
Auxiliary files types are:
EDM (editing mask)
LCM (land cover map)
HSD (hillshade display)
|Used vertical datum for the main product
Pixel position whose height values has been edited receive the background value –32767.0 in the HEM.
All 30m EDEM and DCM products between 0° - 60° North/South latitude have a file extent of 1° in latitude direction and 1° in longitude direction. Between 60° - 80° North/South latitudes a product has an extent of 1° x 2°, between 80° - 90° North/South latitudes a product tile has an extent of 1° x 4°.
The pixel spacing for the TanDEM-X 30m EDEM and the DCM product in latitude direction towards the poles is constant at 1 arcsec, but the pixel spacing in longitudinal directions is not. Instead 6 different zones with different longitudinal pixel spacing ranging from 1 arcsec to 10 arcsec are defined for both the Northern and Southern hemisphere. In a metric scale the latitude pixel spacing varies only slightly due to the ellipsoid flattening between 30.92m at the equator and 30.82m at the pole (rounded to 31m in the table below), while for the longitudinal pixel spacing larger differences are present.
This chapter gives a short overview of the main characteristics of the TanDEM-X 30m DEM Change Maps (DCM).
These are offered for download and follow the summarized description given hereafter. DLR recommends
for in-depth reading the download of the latest DEM Change Map Product Description, which can be found here:
The TanDEM-X 30m DEM Change Maps (DCM) Product Description
The TanDEM-X 30m DEM Change Maps (DCM) are a product which is given in 1 arcsec. It follows the following characteristics:
The TanDEM-X 30m DEM Change Maps product aims to provide global terrain change information that is particularly useful for various fields, including mining, glaciology, and forest monitoring. The product shows changes between DEM generated with data collected between 2016 and 2022 (note that the big majority of the data was acquired between 2017 and 2021) and the TanDEM-X 30m Edited DEM. This represents the difference between two Digital Surface Models (DSM), which means it does not represent the bare earth surface differences, but changes e.g. through vegetation or man-made objects are observable.
For each tile, two DEM change maps are provided in order to keep the respective unique timestamp for each pixel: one with the change of the oldest pixel – or first DEM change - in the new dataset, and another with the change of the newest pixel used – or latest DEM change. Thus, the two maps differ when there are multiple coverages. In the case of a single coverage, both maps contain the same information. This product is a first step for visualizing changes in glaciers, ice sheets, coastlines and forests on a global scale which is important for understanding the impacts of climate change.
Note: The DEM Change Maps will be extended locally to provide detailed information on changes to the Earth's surface over time in form of a stack. It is particularly useful for monitoring changes in topography due to natural disasters, land subsidence, glacier melting, or deforestation.
The TanDEM-X 30m DEM Change Maps product is delivered in a compressed ZIP (*zip) format. Each of the two zip files, corresponding to first and last changes, contains a main folder, which contains the meta data of the product in XML (*.xml), a thumbnail and an overview image of the DCM format and the following 4 subfolders:
This is a brief description of the 4 raster layers:
The DCM as well as the DATE, CIM and HAI layers are given in a GeoTIFF (*.tif) raster format, but with different bit depths and data types. Missing DCM and HAI values receive the background value –32767.0 whereas missing CIM and DATE values are set to 0.
A quicklook with legend is provided for each layer. For the DCM, CIM and DATE layers, full resolution png that are also used
for the kmz files are available.
Finally, the meta data file includes various parameters that help to work with the DCM product such as statistics on the DEM changes and an assessment of their reliability.
The file naming convention of TanDEM-X DCM products is derived from the standardized TanDEM-X DEM products naming convention. It refers to the latitude and longitude value of the center of the lower left or southwest corner pixel of a DCM product, but other information is coded in the file base name or folder name as well. The prefix string in the file base name has the general form: TDM1_tttt_nn_BbbXxxx_FFFF_SSSSSSSSS_hhhh.tif (e.g. TDM1_DCM__10_N57E022_DCM_FIRST1622_EFEF.tif, TDM1_DCM__10_N57E022_HAI_LAST1622_EFEF.tif) The underlined letters and the underscores are literals, i.e. remain unchanged for all files. The other letters are defined in the following table:
|Product type, i.e. DCM_
|Spacing (in latitude), 10 stands for 1 arcsec grid
|“N” if the center of southwest corner pixel of a tile is on the equator or north of it. “S” if it is south of the equator.
|2-digit latitude value of the center of the southwest corner pixel of a tile in degrees
|“E” if the center of the southwest corner pixel of a tile is in the eastern hemisphere, “W” in the west one. If the center of the southwest corner pixel of the tile is exactly at 0° longitude, this is “E”. If the center of the southwest corner pixel is exactly at ±180° longitude, this is “W”
|3-digit longitude value of the center of the southwest corner of a tile in degrees.
Layer type, will be one of the following:
DCM_ (for the DEM change map)
HAI_ (for the height accuracy Indication)
CIM_ (for the change indication mask)
DATE (for the layer containing the acquisition dates)
Map suffix indicating which processing variant and years are considered for the DCM computation:
“FIRST1622” contains the first or earliest changes within the considered data acquired between 2016 and 2022
“LAST1622” contains the last or latest changes within the considered data acquired between 2016 and 2022
|CRC code in hexadecimal computed from the acquisitionItemId and scene numbers that have been used for the DCM generation. Note that only the acquisitions dedicated for the production of the new TanDEM-X DEM 2020 were considered but more acquisitions are available between 2016 and 2022, so this code is different if other data are used
The product tile extent and pixel spacing are the same as for the TanDEM-X 30m Edited DEM therefore see section above.
Users must be aware of the following aspects when using the TanDEM-X DEM Change Maps:
Radar waves are able to penetrate into volumetric targets, such as vegetation and snow and ice. The amount of penetration depends on the radar frequency, the acquisition geometry and the characteristics of the target itself (e.g. vegetation structure and density or snow properties). In these cases, the estimated height from an InSAR-derived DEM (i.e. the radar reflective surface) represents the location of the mean phase center of the backscattered signal from the illuminated volumetric target and it is typically located below the real surface. Differently, no penetration occurs over bare surfaces and, in this case, the retrieved topographic height from InSAR-derived DEMs represents indeed the height of the real surface.
Moreover, the DEM differences depicted in the DEM Change Maps are evaluated with respect to the TanDEM-X 30m EDEM, that corresponds to an edited version of the original TanDEM-X Global DEM product, generated by mosaicking overlapping single-scene DEMs, called RawDEMs, acquired in a time span between the end of 2010 and 2015 (at least two acquisitions were utilized over low-relief areas, while up to about 10 acquisitions were necessary over high-relief terrain in order to achieve the specified accuracy). Therefore, the topographic height depicted by the non edited TanDEM-X 30m EDEM represents an estimation of the mean height of the radar reflective surface, derived using an averaging procedure weighted by the reliability of each single input RawDEM. Temporal changes which occurred during the acquisitions time span were also averaged in the mosaicking.
The above aspects have the following consequences:
German Aerospace Center (DLR)
Airbus Defence & Space GmbH
GFZ German Research Centre for Geosciences
The TanDEM-X mission (TerraSAR-X add-on for Digital Elevation Measurement) opened a new era of spaceborne radar remote sensing. It is the world's first bistatic SAR mission to be formed with two almost identical satellites flying in a closely controlled formation with typical distances between 250 and 500 meters. The main objective of the mission was to generate a consistent global digital elevation model with unprecedented accuracy. TanDEM-X also offers a highly reconfigurable platform for demonstrating new SAR techniques and applications. The TanDEM-X mission measures the entire land surface of the earth that is 150 million square kilometers, several times completely. In addition to the high horizontal resolution according to a horizontal sampling of 12 meters and the high vertical accuracy, the elevation model created with the TanDEM-X and TerraSAR-X satellites has another outstanding advantage: It is consistently homogeneous and thus the basis for a uniform map material worldwide. The Earth's surface is a very dynamic system when analyzed at this level of accuracy. Not only height changes in glaciers, permafrost regions and forests but also agricultural activities and changes in infrastructure leave clear marks in the DEM. Therefore, an additional complete acquisition of the Earth's landmass is carried out from September 2017 until end of 2019 to provide an independent unique DEM-data set. The resulting product, called "TanDEM-X DEM 2020" will allow monitoring topographic changes on a global scale.
To get access to the products a self-registration is necessary with your personal address details, including a valid email address, and a user name.
Data Protection Consent TanDEM-X 30m Edited DEM/DEM Change Maps
Download Service for the automated processing of personal data as part of the provision
of Digital Elevation Model data / Terrain Model data from the TanDEM-X Mission
Licensing Agreement regarding the use of the TanDEM-X 30m Edited DEM and the DEM Change
Maps data product
DLR Earth Observation Center Geoservice Acceptable Use Policy and Conditions of Use ("AUP")
For downloading TanDEM-X 30m Edited DEM/ DEM Change Maps products two options via HTTPS encrypted connections are supported and a login with your user name and password (from the self-registration described above) is mandatory. FTP methods are not provided.
Variant A – Using a HTTPS Web browser & map-based interface
This download option is recommended for users who wish to download a few products and who prefer the usage of a map driven interface for the selection of the products. For downloading few geocells known by name or the complete global data set, we recommend the usage of a client/command line tool (see Variant B below).
Enter the URL of the map interface in a new web browser tab:
This page will appear with basic information about the TanDEM-X mission on the left and the map interface (showing a hill-shade color-coded version of the TanDEM-X EDEM) with the polygon outline for each individual DEM geocell on the right. The layer(s) to be depicted in the map can be selected by clicking the icon in the top right corner. Zoom to your region of interest, if needed.
Select the desired geocells (=left-click with the mouse on the corresponding geocell). The name of the product geocell appears in a list on the left side.
Alternatively, you can also draw a search rectangle in order to download the products for a larger region of interest. Press the CTLR key on your keyboard while left-clicking with the mouse on a point and drag and draw the rectangle on the map. The rectangle will be closed and the geocells will be selected, by releasing the mouse button. Selected geocells appear on the left side of the page. You can remove single items from the list by selecting the trash bin icon associated which each item.
After the desired geocells have been selected, they can be saved on your computer file by file by clicking on the download icon associated to each item. If you are not logged in to this point, then the login page will be shown.
Automated download for larger areas: If you want to automate the download of a larger area you can select the ‘List’ icon to save the download list to an ASCII text file (with an absolute pathname for each file per line), or you can select the metalink icon to save the file list to an XML-like metalink file.
The ASCII file list can then be fed to a command line FTP client (e.g. wget or cURL, which are included in numerous Linux distributions, but are also available for Windows OS), or to a download manager (e.g. aria2). The following code examples will illustrate the usage of those command line tools. The final line of code might need some adaptions with respect to individual system settings (e.g. whether a proxy is needed), but might serve as a starting point.
Suppose you have saved the list to the name ‘TDM30mDEM-url-list.txt’ to your current working directory and the download directory will
be the current working directory as well, then the wget
command would be the following one-liner (Windows OS, CMD command line):
wget -i TDM30mDEM-url-list.txt --auth-no-challenge --user=username --ask-password
The cURL command line (Linux OS) would be:
curl $(printf ' -O %s' $(<TDM30mDEM-url-list.txt)) -u 'username:password'
or, alternatively (Linux OS)
xargs -a TDM30mDEM-url-list.txt -L1 curl -O -u 'username:password'
The aria2 command line would be:
aria2c -i TDM30mDEM-url-list.txt --http-user 'username' --http-passwd 'password'
The metalink XML file can be fed to a download manager tool (e.g. aria2). Suppose you have saved the metalink to the file name ‘TDM30.meta4’ in your current working directory, then the command line for aria2 would be:
aria2c -M TDM30.meta4 --http-user 'username' --http-passwd 'password'
For the TanDEM-X 30m DEM Change Maps products the map interface provides the same functionality as for the EDEM products.
Please note that by clicking on one geocell you are selecting 2 zip files offered for download: one zip file for the first, and one zip file for the last change map, as shown below.
You can directly inspect and download single files by entering the download server location in a web browser; you will be prompted to login and to enter your credentials.
Alternatively go to the login form at URL:
Login by entering your username and password you have registered with, and submit the login form.
Enter the URL of the download server in a new web browser tab:
Hierarchical Directory Structure
The main “/files” directory of the EDEM as well as the DCM server contain subdirectories. The first subdirectory level is based on latitudes, one separate directory for each latitude value; each latitude subdirectory is subdivided into further subdirectories for the longitude spaced by 10 degree. Only subdirectories actually containing EDEM or DCM tiles are visible.
Example: the directory ‘‘/TDM1_EDEM_10_N49/TDM1_EDEM_10_N49E010' contains the following 10 subdirectories:
The final product directories contain both, all unpacked files belonging to the products, as well as a zipped version including all files. To save download time we recommend to download the zip files only.
Recursively download the whole data set with a client
The complete global data set can be downloaded non-interactively using a client program like wget, which is provided with many Linux distributions as well with Apple OS, but can also be utilized for Windows OS. A source can be found by an internet search using “wget Windows 32 bit”, or “wget Windows 64 bit” for the latest Windows OS versions. In principal it is sufficient to simply download and copy the wget.exe into your current working directory. Please refer to the internet sources, if you want to start wget from any directory. For this task you need admin rights on your machine, and need to learn the handling of windows path variables.
Open the windows command line terminal (CMD), and browse to your current directory, where you have placed the wget.exe file. In order to download the complete global EDEM data set in your current working directory, limiting to the zip files only and preserving the hierarchical directory structure, use for example:
wget --user=your_username --auth-no-challenge --ask-password --no-parent -A "*.zip" -r https://download.geoservice.dlr.de/TDM30_EDEM/files/
If the hierarchical directory structure is not needed you can use the keyword ‘--no-directories’. All the zip files are copied directly in your current working directory:
wget --user=your_username --auth-no-challenge --ask-password --no-parent -A "*.zip" --no-directories -r https://download.geoservice.dlr.de/TDM30_EDEM/files/
For a joint processing with other height data the compatibility of the horizontal as well as the vertical reference has to be assured, otherwise positional and/or vertical offsets with a magnitude up to decameter range might show up. Hence, a transformation or even a chain of transformations towards compatibility is needed in the most cases, whose complexity level depends on the target system, and starts with the question in which horizontal (=positional) AND vertical (=height) reference system is the data set in. An exact knowledge of both reference systems is mandatory.
The TanDEM-X 30m Edited DEM is given in ellipsoidal heights (height over the WGS84 ellipsoid) as well as in orthometric heights (heights over the geoid EGM2008).
Ellipsoidal height is purely geometric definition of height and is the distance measured along the normal of a reference ellipsoid to the point on the Earth surface. The vertical datum of the TanDEM-X 30m DEM data set is the WGS84 ellipsoid, hence the height values given by the TanDEM-X 30m DEM data sets are heights above the ellipsoid or ellipsoidal heights. If the ellipsoid of the reference height data sets is not the WGS84 ellipsoid, which is mostly true for the majority of national height data sets, then a datum transformation in three-dimensional Cartesian space is required. For small- and mid-scale mapping application e.g. a 7 parameter Helmert transformation (3 translation parameters, 3 rotation parameters, 1 scale factor) might be sufficient and is mostly integrated into common GIS software. For higher accuracy levels please contact your cadastral authority to obtain improved parameter sets for this task.
For national height systems two basic concepts of physical height definition based on the gravity field of the earth are widely used: orthometric height, or normal height.
Orthometric height is the distance along the plump line from a surface point to a reference geoid. The geoid is a surface based on the gravity potential and derived from gravity measurements, but assumptions about the Earth mass density distribution are required. The mean sea level (MSL) approximates best the geoid.
Please note in this context that the height values represented by other freely available global/near global height data sets (SRTM 1-arcsec, ASTER GDEM2, ALOS World 3D) are referenced to a geoid instead of an ellipsoid, and their height values have to be considered as orthometric heights. The relation between ellipsoidal height and orthometric height is given by:
h = H + N
h: Ellipsoidal Height
H: Orthometric Height
The geoid model used for global/near global height data sets is in the most cases either the global EGM96, or the EGM2008 geoid, which both can be easily found and downloaded by a global internet search. Please check the documentation of your reference DEM data set, which geoid model is in use. If the pixel spacing of DEM and geoid model is not equal, bilinear interpolation should be used for resampling of geoid undulations. The conversion from ellipsoidal to orthometric height or vice versa is simple math given the formula above.
The alternative concept of normal height does not use any hypothesis about the Earth mass density distribution, but refers in addition to the local reference ellipsoid, and originates historically from terrestrial levelling practice before the rise of the satellite geodesy age and is widely used in European countries. The theoretical reference plane related to normal heights is called quasi-geoid. The relation between ellipsoidal heights and normal heights is given by the formula:
h = HN + ζ
| Ellipsoidal Height
| Normal Height
The difference between the orthometric height and the normal height of a point is not dramatic and is usually in the range of some centimeters to decimeters, but can also reach 1.5m. Sources for adequate geoid or quasi-geoid models are usual the national cadastral authorities (e.g. in Germany the Federal Agency for Cartography and Geodesy, BKG).
To acknowledge the scientists, who have generated and provided the TanDEM-X 30m Edited DEM and its layers, we request that users include the corresponding bibliographic citation in their work. Following references shall be cited:
[R01] González, C., Bachmann, M., Bueso-Bello, J.-L., Rizzoli, P., Zink, M. (2020): A Fully Automatic Algorithm for Editing the TanDEM-X Global DEM. Remote Sensing, 2020, 12(23):3961. https://doi.org/10.3390/rs12233961
[R02] Bueso-Bello, J.-L., Martone, M., González, C., Sica, F., Valdo, P., Posovszky, P., Pulella, A., Rizzoli, P. (2021): The Global Water Body Layer from TanDEM-X Interferometric SAR Data. Remote Sensing, 2021, 13(24):5069. https://doi.org/10.3390/rs13245069
[R03] Martone, M., Rizzoli, P., Wecklich, C., Gonzalez, C., Bueso-Bello, J.-L., Valdo, P., Schulze, D., Zink, M., Krieger, G., Moreira, A. (2018): The Global Forest/Non-Forest Map from TanDEM-X Interferometric SAR Data, Remote Sensing of Environment, vol. 205, pp. 352-373, Feb. 2018
To acknowledge the scientists, who have generated and provided the TanDEM-X DEM Change Maps Product and its layers, we request that users include the corresponding bibliographic citation in their work. Following references shall be cited:
[R04] Lachaise, M., Schweißhelm, B. (2023): TanDEM-X 30m DEM Change Maps Product Description, Issue Public Document TD-GS-PS-0216 Issue 1.0, 12.10.2023
[R05] Lachaise, M., González, C., Rizzoli P., Schweißhelm, B., Zink, M. (2022): The New Tandem-X DEM Change Maps Product, IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium, Kuala Lumpur, Malaysia, 2022, pp. 5432-5435, doi: 10.1109/IGARSS46834.2022.9883612
[R06] Wessel, B., Huber, M., Wohlfart, C., Marschalk, U., Kosmann, D., Roth, A.(2018): Accuracy Assessment of the Global TanDEM-X Digital Elevation Model with GPS Data.
ISPRS Journal of Photogrammetry and Remote Sensing. Vol. 139, pp. 171-182.
[R07] Rizzoli, P., Martone, M., Gonzalez, C., Wecklich, C., Borla Tridon, D., Bräutigam, B., Bachmann, M., Schulze, D., Fritz, T., Huber, M., Wessel, B., Krieger, G., Zink, M., and Moreira, A. (2017): Generation
and performance assessment of the global TanDEM-X digital elevation model.
ISPRS Journal of Photogrammetry and Remote Sensing, Vol 132, pp. 119-139.
[R08] Wessel, B. (2016): TanDEM-X Ground Segment – DEM Products Specification Document. EOC, DLR, Oberpfaffenhofen, Germany, Public Document TD-GS-PS-0021, Issue 3.2, 2016. [Online]. Available: https://tandemx-science.dlr.de/
[R09] Zink, M., Bachmann, M., Bräutigam, B., Fritz, T., Hajnsek, I., Krieger, G., Moreira, A., Wessel, B., TanDEM X: The New Global DEM Takes Shape, IEEE Geoscience and Remote Sensing Magazine (GRSM), 2(2), pp. 8-23, 2014.
[R10] Krieger, G., Zink, M., Bachmann, M., Bräutigam, B., Schulze, D., Martone, M., Rizzoli, P., Steinbrecher, U., Antony, J.W., De Zan, F., Hajnsek, I., Papathanassiou, K., Kugler, F., Rodriguez Cassola, M., Younis, M., Baumgartner, S., López-Dekker, P., Prats, P., Moreira, A., 2013. TanDEM-X: a radar interferometer with two formation-flying satellites. Acta Astronaut. 89, 83-98. August-September.
[R11] Krieger, G., Moreira, A., Fiedler, H., Hajnsek, I., Werner, M., Younis, M., Zink, M., 2007. TanDEM-X: a satellite formation for high resolution SAR interferometry. IEEE Trans. Geosci. Rem. Sens. 45 (11), 3317-3341.
Further information, as well as proposal web forms for the higher resolution unedited DEM products (12m & 30m DEM product) at:
vdatum: A freeware software tool with a graphical user interface for vertical (and horizontal) grid transformations, provided by the United States National Oceanic and Atmospheric Administration (NOAA):
For technical problems, e.g. with the registration, the HTTPS download, or with the download via map interface etc., please contact the EOC Geoservice via contact form:
For general questions about the TanDEM-X 30m Edited DEM product, or other TanDEM-X data products, please contact the TanDEM-X Science Coordination via email:
You can find further information, as well as a proposal web forms for the higher resolution DEM products (unedited 12m & 30m DEM product) at URL:
The exclusive commercial data exploitation rights for TerraSAR-X und TanDEM-X products are with the AIRBUS Defence & Space GmbH. TanDEM-X DEM products are marketed by AIRBUS under the name WorldDEM. You can find more information about the WorldDEM product portfolio and contact information here: