nanog mailing list archives
Re: Rising sea levels are going to mess with the internet
From: William Herrin <bill () herrin us>
Date: Thu, 26 Jul 2018 15:18:46 -0400
On Thu, Jul 26, 2018 at 2:00 PM, Chris Adams <cma () cmadams net> wrote:
Once upon a time, William Herrin <bill () herrin us> said:On Thu, Jul 26, 2018 at 12:58 PM, Jason Kuehl <jason.w.kuehl () gmail com> wrote:Science https://climate.nasa.gov/vital-signs/sea-level/"The first graph tracks the change in sea level since 1993 as observed by satellites." I *really* want to understand the technology that lets a satellite hundreds of miles in the sky detect a 3mm change in average global sea level between the start and end of the year with an error bar that grows to only 4mm over a quarter of a century.Well, you must not *really* want to understand, since there's a "Learn more" link to follow on the above page that (after a couple more clicks) would lead you to this page that has some explanation: https://www.aviso.altimetry.fr/en/techniques/altimetry.html
Chris, I understand how radar altimetry works. I would like to understand how they achieve the claimed precision. 3.2mm is one heck of a precise measurement from a flying platform hundreds of kilometers away, particularly when that requires the platform itself to be located with even higher precision against some reference points deemed stable for the purpose of making the measurement. On Thu, Jul 26, 2018 at 3:09 PM, Jameson, Daniel <Daniel.Jameson () tdstelecom com> wrote:
Its not satellite data, The data is from tidal sensors
The second chart is from tidal sensors. Regards, Bill Herrin -- William Herrin ................ herrin () dirtside com bill () herrin us Dirtside Systems ......... Web: <http://www.dirtside.com/>
Current thread:
- Re: Rising sea levels are going to mess with the internet, (continued)
- Re: Rising sea levels are going to mess with the internet Jeff Shultz (Jul 26)
- Re: Rising sea levels are going to mess with the internet Rob McEwen (Jul 26)
- Re: Rising sea levels are going to mess with the internet Justin M. Streiner (Jul 26)
- Re: Rising sea levels are going to mess with the internet bzs (Jul 26)
- RE: Rising sea levels are going to mess with the internet Naslund, Steve (Jul 26)
- Re: Rising sea levels are going to mess with the internet James Downs (Jul 27)
- Re: Rising sea levels are going to mess with the internet William Herrin (Jul 26)
- Re: Rising sea levels are going to mess with the internet Chris Adams (Jul 26)
- RE: Rising sea levels are going to mess with the internet Jameson, Daniel (Jul 26)
- Re: Rising sea levels are going to mess with the internet Chris Adams (Jul 26)
- Re: Rising sea levels are going to mess with the internet William Herrin (Jul 26)
- RE: Rising sea levels are going to mess with the internet Naslund, Steve (Jul 26)
- Re: Rising sea levels are going to mess with the internet Stephen Satchell (Jul 26)
- Re: Rising sea levels are going to mess with the internet Rod Beck (Jul 26)
- Re: Rising sea levels are going to mess with the internet keith (Jul 23)