Questions about the SINEX combination residuals graphs

Where do the numbers plotted come from?

The residuals information is kindly provided by Bruno Garayt, IGS Reference Frame Coordinator, of Institut Geographique National. The plots of North (red) + East (brown) and Height residuals represent the position residuals for this station, between the weekly solution and the cumulative solution. Error bars are the standard deviation for this station, based on the weekly solution covariance information.

Sources of more information about the SINEX combination are available in recent IGS Annual and Technical Reports , and the MIT GNAAC's Global Time Series Page. The IGS Reference Frame products are available for download from the IGS Global Data Centers. Follow the links at right under "Geocentric Coordinates" in our product table.

What do vertical lines with either rec, ant, and ecc printed above indicate?

Vertical lines are plotted onto a graph whenever a site change in receiver (rec), antenna (ant), or eccentricity (ecc) is documented in the IGS SINEX template file, which is generated daily from the site logs on file at the Central Bureau.

What are the "Most recent week" plots showing me?

The residuals between the weekly and cumulative solutions, with error bars as described above, for the most recent week only. This is shown for all IGS sites, with this particular site plotted in blue. This gives the viewer an idea how the recent position solution for this site compares with those for other IGS sites.

What are "good" numbers?

Primarily one looks for the time-series of the residuals to be more or less a smooth plot, and for the standard deviation of the residuals to be similar to (or smaller than) other IGS sites.

This page last updated: 13 May 2010
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