Local Tie Information Report, IERS Network Site: Washington D.C.

In the spirit of scientific cooperation, the National Geodetic Survey (NGS) contributes to future realizations of the International Terrestrial Reference Frame (ITRF) by providing the International Earth Rotation and Reference Systems Service (IERS) with local tie information for geodetic techniques co-located at IERS Network Sites considered a priority by that service. Within NGS, these type surveys are the responsibility of the IERS Site Survey (ISS) program. During June, July and August of 2012, the NGS ISS program conducted a local tie vector survey at IERS network site WASHINGTON. Eight space geodetic technique instruments are co-located at this site, consisting of two very long baseline interferometry (VLBI) radio telescopes, two satellite laser ranging (SLR) systems and three GNSS antennas, all owned by the U.S. National Aeronautics and Space Administration (NASA). Prior to the survey, the French National Institute of Geographic and Forest Information (IGN) installed a new Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) antenna, replacing GREB (DOMES# 40451S176). This report documents the instrumentation, procedures, data analysis, and local tie information results associated with this survey.