Station Selection Criteria

 

Considerations:

 

1. Length of time series.

 

2. Quality of monument, assessed in a quantitative manner.

 

3. Number of jumps in time series, related to equipment changes.

 

4. Type of antenna being used (phase center corrections required)

 

5. Quality of station support and ability to influence owners of site

to maintain geodetic standards.

 

The committee felt that:

 

1. Detailed information was needed for every site, including photos

and descriptions of the monument and its location (e.g. bedrock).

 

2. Site operators should be invited to become a reference frame

site, but that no promise of inclusion would be made.

 

3. UNAVCO should maintain an online database on sites.

 

4. Initially, sites would need a minimum of 2.5 years with no

equipment changes to  be included as a reference site.

 

5. Sites should be removed from the reference frame

if they no longer keep up to PBO standards.