Delivered-To: igsmail@igscb.jpl.nasa.gov Message-ID: <3F8737BE.70908@jpl.nasa.gov> Date: Fri, 10 Oct 2003 15:50:38 -0700 From: "Angelyn W. Moore" User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.2) Gecko/20030716 To: igsmail@igscb.JPL.NASA.GOV Subject: [IGSMAIL-4646]: More network features at CB web Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 10 Oct 15:50:39 PDT 2003 Message Number 4646 ****************************************************************************** Author: Angelyn Moore/IGS CB Dear IGS Colleagues, I'd like to summarize several incremental upgrades to the IGS site pages at the CB over the past months for those of you who may not have visited recently. This refers to the individual sites' pages which are available via the clickable map or list at http://igscb.jpl.nasa.gov/network/netindex.html NRC1 nicely demonstrates most of these, so if you can take a look at http://igscb.jpl.nasa.gov/network/site/nrc1.html while you read this message, the "tour" will make more sense. 0. A small map shows you where the site actually is. 1. The data quality plots introduced in IGSMail 3898 now feature marks showing when a documented station change (receiver, antenna, or eccentricity) occurred. 2. "Change point analysis" is applied to the data quality plots to recognize when a change in the character of the time series has occurred. These are also marked with a "?" symbol on the graphs. This is somewhat experimental, but it seems to be fairly good at identifying changes (even subtle ones) to the slope or noise level. A good example is the L1 multipath at http://igscb.jpl.nasa.gov/network/site/aoml.html -- the eye will tell you that the variation in the data changed around day 255, and the change point analysis agrees. 3. Below the data quality plots you now find graphs of the position residuals for the past year, for those sites that appear in the SINEX combination. The residuals data is of course provided by the Reference Frame Coordinator (Rémi Ferland of Natural Resources Canada). Also shown is the "IGS spectrum" of each component: the residual and standard deviation for all IGS sites, with that particular site highlighted in blue. This lets the viewer see how that site compares with what is typical in the IGS network. The residuals plots also show the times of documented changes at the station. I should pause here to say that significant credit for these implementations goes to Pete Jeziorek, who has since departed the CB to pursue a Ph.D. at MIT. Thanks Pete! 4. For hourly sites, you find the recent latency of the hourly files, and once again how this compares in the "IGS spectrum." 5. For a time we listed which ACs had utilized that site in the IGS Final orbits during the past quarter. Now you see a table showing which ACs used it in which of several IGS products. This is realized thanks to Analysis Center Coordinator Gerd Gendt and the ACs agreeing to provide information on site usage in a way that we can easily acquire it. We'll be adding more product types as the information becomes available. Eric Richardson has been working on many improvements, most of which are "behind-the-scenes," in how the CB gathers files and information. The product usage table, however, is one nice visible manifestation of this development. There is further documentation with more details for most of these items available via links from these pages. If you have questions remaining, please feel free to ask. Your comments are welcome too. Best regards, Angie ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Angelyn W. Moore, Ph.D. Deputy Director, IGS Central Bureau JPL/Caltech Angelyn.W.Moore@jpl.nasa.gov 4800 Oak Grove Dr. MS 238-540 voice: +1 818 354 5434 Pasadena CA 91109 USA http://igscb.jpl.nasa.gov fax: +1 818 393 6686