Geodesy is not a dead science as some people think. GPS satellites are geodetic satellites. Their orbits have origins at the center of mass of the earth, and are tracked from stations located on a geodetic datum or reference frame.
Q: When I use my prism/antenna poles, I’ve noticed that some are easier to hold still than others. My dealer told me this is because the “bubble sensitivity” of one is higher than the other, with the more-difficult-to-hold pole having higher sensitivity.
This column includes updates on the Global Navigation Satellite System (GNSS) scene, as well as an update on U.S. Global Positioning System (GPS) satellites. It has been announced in various publications that both China and India are making plans to create their own GPS equivalents.
When I used optical theodolites, I checked and adjusted the horizontal and vertical collimation myself. I noticed in my new total station's instruction manual that I only have 30 arc seconds or so of adjustment I can use. The manufacturer requires that I return it to an authorized service center for larger collimation adjustments. Why?