Impactful Coordinate Changes Across SmartNet North America - 11.2021

SmartNet North America launched our adjustment & integrity monitoring program in late 2012 to assure a high quality, standard set of coordinates were available to our customers. As part of this program we established tolerance thresholds that would initiate an investigation into a station coordinates should we see coordinate shift greater than 30 mm during our semi-annual adjustment schedule.

We take adjusting the product (broadcast) coordinates very seriously, as this is immediately reflected to our customers. However, to assure the integrity of the network overall we sometimes reach a threshold that requires us to update the product coordinates. In our most recent adjustment, we have discovered the following stations fall outside of the 30 mm tolerance and require us to update the product coordinates. The update to the coordinates these sites could material impact measurements in the field. As an extra measure to highlight these changes, we are also changing the RTCM ID of each of the following stations (not including stations in CA).

Please refer to the "Site Information Search" tool to determine the amount of the shift, you can view the current and superseded coordinates, we encourage you to watch this short video to learn more about the tool - LINK.

Subsidence Stations - All North America

The following station(s) exhibit large subsidence issues consistent with areas of known subsidence zones, this is not out of the ordinary and we have observed this over a number of years. As these changes as they are significant (5+ cm), they should be accounted for using proper field procedures.

Subsidence Stations - Southwest US (California)

Stations in California had broadcast coordinate adjustments as is customary during the semi-annual adjustment. Please review the Knowledge Base Articles that discuss these adjustments for more information.

However, the following stations exhibit large subsidence issues consistent with the Central Valley subsidence zone, this is not out of the ordinary and we have observed this over a number of years. As these changes as they are significant (5+ cm), they should be accounted for using proper field procedures.