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Satellite Coincidence Search Engine Search for times when one to four satellites were within the same geographic location simultaneously More information is available at ghrc.msfc.nasa.gov/ghrc/glossary.html National Aeronautics and Space Administration (NASA), Global Hydrology Resource Center (GHRC) The Coincidence Search Engine may be used to search for times when one to four satellites were within the same geographic location simultaneously. Searches may be constrained by time, geographic area, and/or distance between the sub-satellite points. Please note that this program does not take into account instrument angle of view. The program uses an archived database of element set data to calculate the orbits, using a model supplied by the Colorado Center for Astrodynamic Research (CCAR). Orbits may be extrapolated for future times, but the accuracy of the orbit decreases as the temporal distance from the last element set increases. Searches are conducted by entering the following: Satellite Selection The satellite selection area lists which satellites may be selected with a checkbox to the left of each satellite's name. Time Interval Selection The time interval selection block is used to bound the time period of the search. It contains boxes for the start date, start time, end date, and end time, as well as a time interval. Area of Interest Selection The four boxes in this block define the area of interest. The default values cover the entire world. You may constrain the search to times when the great-circle distance between the subsatellite points does not exceed a given value. Keywords: Space Exploration and Technology-General Resource tags: Online searching of information; Resources for science aware citizens
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