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Recent content by DanGalbraith

  1. DanGalbraith

    To re-level or not on a re-backsight, back to basics

    Riverbumpkin: If you will state the instrument maker and model there are some specific comments that I could make as to operation of the equipment. If the instrument is not available at present a question or 2 will help: 1. Is it an external vernier reading transit? (This type of instrument...
  2. DanGalbraith

    Robotic Total Station Vs. GPS Surveying

    That’s good procedure. Anything we can do to increase our sight distance and decrease obstructions is good. There are differences in the equipment as well. Some manufacturers have an active tracking system where there is a transmitter/receiver mounted on the instrument and the rover rod. These...
  3. DanGalbraith

    Concrete Slip Form and Properties of Materials

    Thanks again. I’m finding the successful use of Machine Control can be improved with an interest in the entire project flow. Just as there are differences in construction practices, there are little differences in the data that I provide to the contractor that make the data more user friendly...
  4. DanGalbraith

    Concrete Slip Form and Properties of Materials

    Thanks Drumchaser and Dick, not only do I appreciate the thoughtful detailed answers, it’s actually very refreshing to be able to discuss these issues on this level. There are more questions, but first a bit more background. This project is the first successful application of fine grading with...
  5. DanGalbraith

    Robotic Total Station Vs. GPS Surveying

    The learning curve for running the RTK unit is usually very quick, say 1/2 a day. The actual time to produce efficient reliable work might take a few weeks. How the survey is set up and the checks we build into the survey are one of the keys to quality work. By example, redundant observations...
  6. DanGalbraith

    Robotic Total Station Vs. GPS Surveying

    The GPS process you are looking at is termed Real Time Kinematic (RTK) GPS. The stated specification in the horizontal is generally in the 5mm (0.017’) range and 15mm (0.05’) range vertically. Please realize that the specifications are only a single part of the error budget, there are several...
  7. DanGalbraith

    Concrete Slip Form and Properties of Materials

    I am new to this forum, if this is not the correct place to ask this question please forgive me. Background The service I provide is to produce Digital Terrain Modeling for Construction Machine Control. I also provide detailed construction support services such as existing condition surveys...
  8. DanGalbraith

    To re-level or not on a re-backsight, back to basics

    1. With older analog instruments (transits) I would suggest re-leveling...the error that is introduced by not re-leveling is termed the inclination of the axis. 2. Newer total stations and robotic total stations will almost 100% of the time have level compensators that eliminate the need to...

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