+jeff35080 Posted February 15, 2003 Share Posted February 15, 2003 While on a Geocache trip today with my kids, I happened across a benchmark. I just looked it up here on the site and logged it. What I found unusual was that it shows as being last recovered by NASA. Out of curiousity, what interest does NASA have in NGS benchmarks? Here's the benchmark that I found: http://www.geocaching.com/mark/details.asp?PID=EF1238 Jeff http://www.StarsFellOnAlabama.com http://www.NotAChance.com If you hide it, they will come.... Quote Link to comment
+roasteroo Posted February 15, 2003 Share Posted February 15, 2003 I cant answer the question but it think it has to do with the phrase: MULTIPATH WAS OBSERVED BY ''GPS DURING TRAIN PASSAGE. Quote Link to comment
+jeff35080 Posted February 15, 2003 Author Share Posted February 15, 2003 The multipath, I believe, would mean that as the train went by the benchmark that multipath i.e. bouncing signals were observed. In other words, the radio signals were bouncing off train cars as the train went by. As long as there is/was no train there would be no multipath signals that would cause incorrect readings. Jeff http://www.StarsFellOnAlabama.com http://www.NotAChance.com If you hide it, they will come.... Quote Link to comment
+GEO*Trailblazer 1 Posted February 15, 2003 Share Posted February 15, 2003 If you remember way back....Any way the Surveys for Range lines and other types of Astrnomical work was,and is done for the space programs.They have to know exactly where they are at all times.All measurement has purpose and has been constantly updated throughout history as more is known.As of now we are using the historic data to find these bench marks on this site.All this technology has come from our space program and from our defense dept. Which started with Thomas Jefferson and the Louisiana Purchase. http://www.crcss.csiro.au/spin/spin88/spin8802.html http://ipnpr.jpl.nasa.gov/tmo/progress_report2/42-50/50title.htm WHEN ALL ELSE FAILS *GEOTRYAGAIN* http://www.msnusers.com/MissouriTrails [This message was edited by Trailblazer # 1 on February 16, 2003 at 12:57 AM.] [This message was edited by Trailblazer # 1 on February 16, 2003 at 01:01 AM.] Quote Link to comment
boundsgoer Posted February 17, 2003 Share Posted February 17, 2003 I would guess that NASA used this point while establishing a rocket/satellite tracking station, radio relay or some installation needing a precise location. Quote Link to comment
+ScottJ Posted February 18, 2003 Share Posted February 18, 2003 We take for granted that objects in space are able to tell us exactly where we are on the ground. We tend to forget that before that can happen, the process has to go in the other direction. NASA uses ground benchmarks to refine and correct their reference between ground and space-based navigational datums. -- Scott Johnson (ScottJ) Quote Link to comment
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