Land Surveyor Forum

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  • Land Surveyor
    Mkondo Moyo September 26, 2017 at 1:56am
    Computed distance/measured distance
  • Seeking Employment
    Dean Ryan Davis September 23, 2017 at 2:57pm
    I don't know if this will help or not but I believe that the abbreviation Delta INSF means change in scale factor. I'm not sure why one of the units would be in parts per million and the other would be in meters. In algebraic expressions, the Delta symbol almost always indicates change or difference.
    • Land Surveyor
      J. Anthony Cavell > Dean Ryan Davis September 23, 2017 at 6:27pm

      I assume the previous replies are correct. Using an electronic total station - one may be invited to enter temperature, barometric pressure and relative humidity. When that is entered the display shows a scale factor for the EDM.

      I believe the form is laid out in such a way that one figures the scale factor as a percentage. Then the user multiplies the raw length by the scale factor to determine the linear quantity result of applying the SF. The linear quantity is added to (or subtracted from) the raw quantity to determine the final, useful quantity.

      JAC

  • Land Surveyor
    Christopher James Drayton September 23, 2017 at 2:40pm
    In sf would be instrument scale factor. This would probably come from the manufacturer of the instrument used (?).
  • Land Surveyor
    J. Anthony Cavell September 23, 2017 at 2:12pm

    I amnot 100% sure of the abbreviation LNSF or INSF. The lower case is ambiguous to my eye. 

    When I look at the form in total, I am leaning toward a meaning of Linear Scale Facor as a percentage of length and as a resulting distance calclated from it.

    Again, interpreting this form, I believe the scale factor is a characteristic of the projection and your location within it.

    JAC

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