Conference announcement and call for papers for the ISPRS Congress to be held in July, 2016 in Prague. http://www.isprs2016-prague.com Working Group IV/3 will be hosting several sessions on Global DEM interoperability and invite your participation in the sessions. All topics related to digital elevation models are welcome including DEM production activities, DEM evaluation/validation methods and results, coastal bathymetry and topography fusion, bare earth retrieval methods, and software for DEM assessment. For further information on topics of interest see the terms of reference for Working Group IV/3 at http://www2.isprs.org/commissions/comm4/wg3.html. Abstract submission is now open on the Congress web site (see: http://www.isprs2016-prague.com/). The deadline for abstract submission is December 13, 2015. Please feel free to forward the call for papers to interested colleagues.