This catalogue is designed to provide descriptions and occupation histories of high-accuracy geodetic measuring sites employing space-related techniques. The emphasis of the catalogue has been in the past, and continues to be with this edition, station information for facilities and remote locations utilizing the Satellite Laser Ranging (SLR), Lunar Laser Ranging (LLR), and Very Long Baseline Interferometry (VLBI) techniques. With the proliferation of high-quality Global Positioning System (GPS) receivers and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) transponders, many co-located at established SLR and VLBI observatories, the requirement for accurate station and localized survey information for an ever broadening base of scientists and engineers has been recognized. It is our objective to provide accurate station information to scientific groups interested in these facilities.
Whenever possible, the information provided for each site includes site location and geographic region, primary scientific purposes, physical description, topographic map reference and source, geological province, and local geology. The number, type, inscription, system capability, and geodetic parameters are included for each observing monument located at a particular site. Differential coordinates and their sources have been listed with this site information. A sketch detailing the positions of the observing and reference monuments is also included for many of the sites. Furthermore, past occupation information is listed for each site.
Users of the catalogue should exercise caution before using absolute positions contained in the Monument Information section. These values are given in a variety of regional and global datums thus making direct comparisons inappropriate. The Crustal Dynamics Data Information System (CDDIS) maintains files containing station positions, with velocities, in a common global reference frame. The positions listed in the catalogue, when possible, are tabulated to five significant digits solely for the recovery of local (intrasite) vectors with subcentimeter precision.
Several conventions used in this document should be noted. Confusion has arisen at times regarding the convention of elevation (orthometric height) and ellipsoidal height. The values detailed in this document are as specific as possible in this regard. Differential coordinates between monuments are, when available, given in north, east, and up, a planar coordinate system, for distances under 100 meters. For greater distances, differential coordinates are given in X,Y, and Z, an Earth-centered coordinate system. Monument numbers were occasionally established after the placement of the actual monument disk; therefore, the disk inscription may or may not contain the assigned number. The monument numbers of the fixed VLBI antennas (or radio telescopes) usually refer to the intersection of axes or the optical center of the telescope. Deviations are explained within the descriptive information of the monument.
Updates of this version of the catalogue will be distributed when warranted (approximately two to four times per year). These pages will include revisions to existing information as well as new site sections for which complete descriptions were not available at time of publication. The Program actively pursues site information on existing and proposed stations and welcomes contributions from all groups engaged in geodetic measurements. The editors have relied on contributions from dozens of scientific groups and government agencies for the information presented. When data was not provided in the catalogue format an effort was made to reformat the information whenever possible. Great care was taken in presenting this information, however errors do occur. We ask that upon receipt of the catalogue contributors validate the published information. Errors and omissions brought to our attention will be immediately corrected and distributed. Data may be submitted either by mail or electronically to the INTERnet address -SITECAT@CDDIS.GSFC.NASA.GOV.
The site information contained in this document is also available through the CDDIS. The CDDIS is accessible by both TCP/IP and DECnet protocols. Users can contact Carey Noll at the address below for further details on the CDDIS.
The editors would like to acknowledge, with great appreciation, the numerous contributors to this catalogue. These international organizations include: BFEC, MIT, JPL, AUSLIG, JHD, CRL, NOAA, NGS, CIGNET, GSI, EMR, DMA, DUT, IPRG, IGN, IfAG, RSASLIG, TELESPAZIO, Statens Kartverk, and literally dozens of other observatories and scientific groups. Thank you all for your contributions to this effort and to all previous.
Mark A. Bryant Carey E. Noll NASA/GSFC NASA/GSFC Code 920.1 Code 920.1 Greenbelt, MD 20771 Greenbelt, MD 20771 (301) 286-9837 Voice (301) 286-9283 Voice (301) 286-4943 FAX (301) 286-4943 FAX BRYANT@CDDIS.GSFC.NASA.GOV NOLL@CDDIS.GSFC.NASA.GOV
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