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I use related point names like "10a", "10b", "10c" or, better yet, names connected with the OPUS solution such as "10Day120" for the OPUS solution from Day 120.
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10, then you assign the different OPUS solutions names other than "10". If you have more than one OPUS solution on Pt. > So you get a list of different positions for the same point? What do you tie your baselines to if you have more than one point 10?
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> The Star*Net Manual should have the format too. The values of "GPS FACTOR" of 2.5 for horizontal components and 5.0 for vertical are empirically derived from summertime work in Central Texas. You can derive an appropriate scalar to apply to the OPUS-derived weights. With the G2 and G3 lines being formed as follows Which is in the general form of variances and covariances: The green lines were extracted from the following covariance matrix that OPUS supplied:Ĭovariance Matrix for the xyz OPUS Position (meters^2). Those of "10Day190a" are merely one estimate of the coordinates of "10". "10Day190a" is the same point as "10", but the coordinates of "10" are subject to adjustment. The orange line is is a zero-length vector, i.e. Where there are multiple OPUS estimates on various days, the suffixes group them together in the output listing. The form of the adjustment is to treat the actual position of "10" as being tethered to the OPUS estimate "10Day190a" (in this case). If the mark is designated as, say, "10", I add a "DayNo" suffix if multiple OPUS solutions on the same point are to be used in the adjustment. The red line is just the NAD83 OPUS estimate of the position. You don't need it if all the vectors are covariance-wieghted, but it doesn't hurt to throw it in. The blue GPS WEIGHT line is needed if you are mixing covariance-weighted vectors with other types in the adjustment. The "#" comment lines are just to remind me of which reference stations were used in the solution. #PID DESIGNATION LATITUDE LONGITUDE DISTANCE(m) That is, the standard covariance-weighted GPS vector in Star*Net looks like this: It is really just a cut-n-paste job with the xyz covariance matrix to create a GPS vector of nominal length = 0 (DX=0 DY=0 DZ=0) with the elements of the upper triangle of the covariance matrix that OPUS supplies used to fill in the covariances of the GPS vector. could you post your method for entering multiple OPUS solutions into Star*Net V6, please?