This AO is related to the provision of the digital elevation products with 12 m and 30 m independent pixel spacing generated by the TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurements) mission launched in 2010. The data is now available for the science community. Detailed information about the TanDEM-X AO and the provided products are included in a technical note available on the TanDEM-X science server Your proposal must be submitted via this web interface. The due date for proposal submission is December 1st, 2016. Further information will be also available during the TerraSAR-X/TanDEM-X science meeting in October, 17-20, 2016 in Oberpfaffenhofen. Further TanDEM-X DEM product variants will be announced in a separate dedicated AO call.