This contribution gives an overview of the Horizon 2020 project EGSIEM (European Gravity Service for Improved Emergency Management) where temporal gravity field solutions from different centers shall be combined. In particular, all aspects where SLR is involved are discussed. Namely, the GNSS orbits established in the framework of a reprocessing are validated using SLR data. We show that improved orbit modeling decreases systematic patterns in the residuals. Further, spherical harmonic coefficients of the Earth’s gravity field were computed up to degree and order 3 using SLR data to five geodetic satellites (January 2003 to December 2013). The resulting SLR normal equations will be stacked with those of GRACE to optimally recover the very long wavelengths of the Earth’s gravity field. The time series of the Earth’s dynamic flattening term (C20) is compared against external solutions. Last, a workflow for establishing a reference frame is presented, which will be based on both GNSS and SLR data.