Washington & Oregon Fall Adjustment - November 12, 2017

It is time for a broadcast coordinate update in Washington & Oregon.  The new broadcast coordinates will be published as of Monday morning November 13 at 5:00 AM ET and will effect Washington & Oregon.

Why are we doing this adjustment?

Washington & Oregon offers a unique set of challenges for RTK users.  While these areas do not suffer from the large positional velocities experienced in California, there are still positional changes that accumulate over time that do affect a customers ability to make repetitive and consistent measurements over time.

On average the position of the stations in Washington & Oregon move between 7 and 10 mm-a-year, and in some areas even more.  The average shift over the entire network for this adjustment was approximately 40 mm (some stations closer the coast experienced much more dramatic shifts).

While the shifts in California require a semi-annual adjustment of station coordinates, we are conducting our first broadcast coordinate update in Washington & Oregon since 2012.

To get a better understanding of why we are doing this adjustment, please watch our new SmartNet North American Adjustment Webinar - LINK.

What does this adjustment mean to me?

In very simple terms it means the broadcast position of the base is going to move between 10 mm and 70 mm.  This is a very significant change that you most likely will realize in the field.

What reference frame and epoch are we moving to?

We will still be in the NAD83(NA2011) reference frame to stay consistent with the NSRS and we are moving to a 2018.000 epoch.

How can I get back to my old coordinates?

With the introduction of Spider 7.1, we are also introducing Multiple Reference Frame (MRF) Mountpoints.  These mountpoints allow you to to access the Common or Last Coordinate Class that was published.  You can find more information on how to use these by watching the video below.

You can also perform your own local transformation, localization or calibration.  For more information about using this technique, please click here - LINK.

How do I see the current coordinates and superseded coordinates?

All current, common, last and superseded coordinates are available on the SmartNet User Portal.  You can find a station's information by using the "Site Information Search" tool, then you can see the current broadcast and processing coordinate, as well as find a button that will allow you to view all the coordinaes available via a MRF mountpoint and superseded positions as well.

Once the new adjustment is published on November 13, we will also update the site database with the new NAD83(NA2011) Epoch 2018.000 coordinates.

For more information on using the "Site Information Search" tool, we encourage you to watch this short video - LINK.

How do I get support to better understand what this adjustment means?

  1. Watch the most recent Adjustment webinar from November 2017 at or our original Adjustment webinar from October 2012 at
  2. Utilize the new MRF Mountpoints to access the Common or Last Coordinate Class that was published.  You can find more information on how to use these by watching the video above.
  3. If you are still unsure of what to do, please attempt to contact your local hardware/support representative first for information on how to use the MRF mountpoints or how to perform a transformation, calibration, localization, etc.
  4. If your local hardware/support representative is unable to answer your question, please search for the keyword "tools" on this Support Site
  5. If you are still unable to find an answer to your question, please email us at or click "new" in the toolbar to submit a new support ticket
Was this article helpful?
0 out of 0 found this helpful
Have more questions? Submit a request


Powered by Zendesk