Great Online Tool for Checking CORS Trending
Another thread (specifically Jim Frame’s comment) reminded me that I was going to share an online resource for looking at CORS stations…
I don’t think that it has been mentioned here, but it needs to be. Here is the condensed story.
A few weeks ago, a new customer called me to let me know that their receiver was not working. They had occupied a point and the OPUS report looked pretty bad. The solution basically blew up. Checking the NGS short term plot, I found this for PLSB (one of the included CORS sites):
which at first glance looks like the site is 0.2 meters (0.65 feet) lower than the published value.It was an 1 hr 50 min occupation so I hot-wired the last epoch (I will save a description of this for another thread if anyone is interested) to make the observation appear to be static and hand picked some ‘better’ nearby CORS. The customers’s observation then returned a decent solution and the GPS was fixed.
I took a moment to complain about this to the NGS and they pointed me to the Nevada Geologic Library station page for PLSB:
http://geodesy.unr.edu/NGLStationPages/stations/PLSB.sta
Honestly, I had never looked at this site before. It is amazing.
There is a lot to digest:
o Graphical indications of station antenna changes
o Position Plots for both IGS08 and NA12but the best thing is the links to nearby earthquake step data at the UC Berkeley Seismology Laboratory.
Honestly, the UNR site is like Geodesy porn. I have spent hours clicking around on the overview map:
http://geodesy.unr.edu/NGLStationPages/gpsnetmap/GPSNetMap.html
(a trick is to click on a CORS square, then when the summary is displayed, right-click and open the detail page in another window.)
So my recommendation for the March 20, 2017 BeerLeg Geodesy Site-of-the-Day is [ UNR ]!
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