NASA’s Crustal Dynamics Data Information System (CDDIS) provides an archive of regional experiment data, previously funded by NASA and international cooperative programs. Starting in 1990, studies in the geophysical integrity of NASA's Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI) sites were undertaken utilizing Global Positioning System (GPS). Small networks of GPS sites were selected in an approximate 10-20 km radius around the main observing monuments at several of key sites. The measurements taken at these "footprint" sites allow analysts to estimate the local tectonic stability of the area they encompass, assuring the integrity of the space geodetic measurements taken at these critical sites. In addition to the surrounding footprint sites, measurements are taken at the reference monuments placed at a distance of 50 to 100 meters to the main marker. GPS measurements at the reference monuments allow analysts to continue to monitor the physical stability of the main observing monuments and provide additional data for the estimation of the regional tectonic stability of the area.
Summary of CDDIS GNSS Experiment Data Holdings
- Spatial and temporal coverage information (see table below)
- Data Volume: ~50 Mbytes/experiment
- Data Format: Typically Receiver INdependent EXchange (RINEX) format; some raw receiver data also available
Experiment Name | Dates | |
---|---|---|
Start | End | |
Alaska - GSFC | 08-Jun-93 | 25-Jun-93 |
Alaska - Lamont | 29-Jun-93 | 25-Jul-93 |
Alaska - USGS | 06-Jun-93 | 23-Jun-93 |
Alaska Network 1990 -- 0 | 11-Jul-90 | 14-Jul-90 |
Alaska Network 1990 -- 1 | 17-Jul-90 | 20-Jul-90 |
Alaska Network 1990 -- 2 | 21-Jul-90 | 24-Jul-90 |
Alaska Network 1990 -- 3 | 26-Jul-90 | 28-Jul-90 |
Alaska Network 1990 -- 4 | 29-Jul-90 | 05-Aug-90 |
Alaska Network 1990 -- 5 | 10-Aug-90 | 18-Aug-90 |
Alaska Network 1991 - 332 | 04-Aug-91 | 19-Aug-91 |
Alaska Network 1991 - 334 | 04-Aug-91 | 19-Aug-91 |
Arequipa Footprint | 18-Feb-94 | 23-Feb-94 |
Baja 93 | 05-Apr-93 | 19-Apr-93 |
California Experiment 13 | 21-Mar-89 | 24-Mar-89 |
California Experiment 14 | 28-Mar-89 | 31-Mar-89 |
California Experiment 15 | 01-Apr-89 | 03-Apr-89 |
California Experiment 16 | 04-Apr-89 | 07-Apr-89 |
California Experiment 17 | 25-Mar-90 | 28-Mar-90 |
California Experiment 18 | 29-Mar-90 | 01-Apr-90 |
California Experiment 20 | 07-Feb-91 | 10-Feb-91 |
Chile Survey Tie 1990 | 20-May-90 | 22-May-90 |
CIGNET | 03-Jun-90 | 11-Aug-90 |
Easter Island Footprint | 26-Apr-93 | 01-May-93 |
Fairbanks Footprint | 03-Sep-91 | 10-Sep-91 |
Fort Davis Footprint | 07-Jun-90 | 19-Jun-90 |
Fort Davis Footprint 2 | 17-May-92 | 21-May-92 |
Fort Ord Footprint | 02-Jul-91 | 17-Jul-91 |
Fort Ord Survey Tie 1988 | 25-May-88 | 28-May-88 |
Geomex 1989 | 29-Apr-89 | 12-May-89 |
GIG '91 -- April 1, 1991 | 22-Jan-91 | 13-Feb-91 |
Goldstone Footprint | 08-Jun-92 | 10-Jun-92 |
GORF Footprint | 03-Oct-90 | 19-Oct-90 |
GORF Footprint 2 | 03-Oct-92 | 19-Oct-92 |
Hat Creek Footprint | 11-Nov-90 | 21-Nov-90 |
Kokee Park Footprint | 09-Aug-93 | 15-Aug-93 |
Mammoth Experiment | 15-Sep-92 | 18-Sep-92 |
Maui Footprint | 19-Aug-93 | 23-Aug-93 |
Mojave 93 | 02-Mar-93 | 06-Mar-93 |
Mojave Experiment | 18-Aug-92 | 22-Aug-92 |
Mojave/Mammoth 93 | 06-Aug-93 | 25-Aug-93 |
Monument Peak Footprint | 09-May-92 | 17-May-92 |
Monument Peak Footprint 2 | 15-Jun-94 | 22-Jun-94 |
Parkfield Experiment 92 | 01-Jun-92 | 06-Jun-92 |
Parkfield Experiment 93 | 10-May-93 | 12-May-93 |
Pinyon Flat Survey 1986 | 03-Jun-86 | 06-Jun-86 |
Pinyon Flats Footprint | 23-May-92 | 01-Jun-92 |
Presidio Footprint | 18-Jun-91 | 28-Jun-91 |
Quincy Footprint | 02-Nov-90 | 08-Nov-90 |
Santiago Footprint | 09-May-93 | 14-May-93 |
Simeiz Survey 1991 | 01-Jan-91 | 12-Feb-91 |
Sourdough Footprint | 15-Aug-91 | 28-Aug-91 |
Vandenberg Footprint | 03-Jun-91 | 12-Jun-91 |
Ventura 93 | 02-Nov-93 | 10-Nov-93 |
White Wolf 93 | 26-Jul-93 | 01-Aug-93 |