Includes definitions of Undifferenced, Single Difference, Double Difference and Triple Difference Observables
When processing GPS baselines the term dependent or trivial baselines is sometimes used. Explore those terms along with a mathematical definition.
A detailed look at the extended data section of an OPUS report.
OPUS is becoming a primary means of tying survey networks to the National Spatial Reference System (NSRS). Once data is submitted to OPUS the process is automated with no human intervention. This is very convenient when it works. On the rare occasions when the process results in a poor result, knowledge of the RINEX file format and editing tools such as TEQC from UNAVCO can be used to transform a poor solution into an acceptable solution.
Using OPUS-RS one can obtain geodetic coordinates from GPS observation sessions as short as five minutes. With short observation sessions however, the quality of the observations becomes more critical. It is not unusual for OPUS-RS to fail “due to especially noisy data (among other reasons).” The recommendation included in the email announcing a failed OPUS-RS run is to try another data set. This is not always a practical solution. Using TEQC from UNAVCO one can review and edit RINEX observation files that fail to process using OPUS-RS.