Land Surveyor Forum

Replies

• Land Surveyor

  AHMED ABDULLAH OSMAN SALEH January 31, 2017 at 3:38am

  you can use the Combination S.Factor to determine the difference between the grid and ground coordinates instead of using the Scale factor as it's used to defines the difference in distance between two points on the grid plane and geodetic plan (the ellipsoid) .
  • Land Surveyor

    Nasr Bilal > AHMED ABDULLAH OSMAN SALEH February 1, 2017 at 1:31am

    I'm working in a small area. So I don't need to use the CSF.

    Their is no much differences in the elevation of my area. Max 0.5 m.

    Then the challenge was to stake two points with the ground coordinates with scale factor 1 and compare it with the stake of the same points using the grid values with calculated scale.

    My total station was calibrated 2 days ago and everything was good with no problems.

    I'm using a robotic total station and with ground coordinates I haven't got any problems .
    • Land Surveyor

      Judson Cato > Nasr Bilal February 1, 2017 at 3:42pm

      This may be a stupid question, but did you really expect them to be exactly the same?...
  • Land Surveyor

    Allen Kerley > AHMED ABDULLAH OSMAN SALEH January 31, 2017 at 9:28am

    I would start with checking the prism constant and verifying your poles are plumb.
    • Land Surveyor

      Nasr Bilal > Allen Kerley February 1, 2017 at 1:35am

      Certainly I'm sure of the prism constant and I checked the pole and the plumb both on site and with the agent.

      I'm doing work all the time with this prism and I'm checking the prism with my control points too. No problem recorded.

      Also I verify the measurement with two different prisms with a different constants  
• Land Surveyor

  Valery Deineko January 31, 2017 at 3:21am

  Hi!

  What are distance between control points? 
  • Land Surveyor

    Nasr Bilal > Valery Deineko February 1, 2017 at 1:27am

    175m in max ..
    • 

      Bodie Lloyd Kirori > Nasr Bilal February 12, 2017 at 4:55pm

      Hi Nasr Bilal,

      I hope your GRID  to GROUND coordinates and conversions resolved?.

      The difference of 12 mm in the coordinates would certainly reflect you plane traverse accuracy determined by the Total Station Instrument Type accuracy? Is it a 1" instrument?.

      Using a GPS common control point scale factors (Block Shift) GRID- GROUND- GRID should be 1.000?????? and the reverse value 0.999?????? to achieve +/-mm results.

      Confirm this calculations procedure applied?
• Land Surveyor

  Qabil January 31, 2017 at 12:04am

  HI.it's depend distance of between control points.Scale factor.and coordinate system
  • Land Surveyor

    Nasr Bilal > Qabil February 1, 2017 at 1:27am

    The max distance was 175m.

    I calculated the scale and it works pretty good when I staked the rest of the control points as a check