I have to start New Traverse on a Road with Total Station, Sokkia CX 105. Two Perment Bench Marks already established at start point and other are after every 5 KM. Perment Bench Marks are established by our Client with GPS. I know when i will run my traverse with Total station, it will not give same coordinates on Fixed Bench mark (which is already established with GPS at every 5KM) ,Can any one tell me, how i can close my Total station run traverse on every 5KM Perment bench mark. I mean to say that what will be formula by manually to close it............
This Content Originally Published by a land surveyor to Land Surveyors United Network
Tahnks, Mr. Jason Graves and all who replied on my post.
This question asked to me in a job interview. I know GPS
's established bench marks have CSF, Combine scale factor, Surveyor used it in his Total station survey to established new control points. But when he reached at last Bench mark (which was established by Client with GPS) he found (for example 0.30 cm in Easting and 0.10 Cm difference in Northing) , how surveyor will adjust all his Total station done Traverse survey to get last fixed point Northing and Easting , I know some software can do this but mostly are not free. Does any one have its munual formula or method with which i can adjust whole traverse.
This Alignmet traverse should be closed at last given point...\
If you have already done the traverse with no scale factor involved and you know what the scale factor is. Also I'm assuming that your instrument stores all traverse data including slope distance and vertical angle then you can just manually apply this calc to get your distances with the scale factor applied.
Adjusted Horizontal Dist = ((cos(B)*C)*A
A= Scale Factor
B= Vertical Angle
C= Slope Distance
Once you've re-calced your distances you can re-calc your Traverse to see if it closes.
The only thing can't remember is what the units for the scale factor is so you'll have to have a play to find out what fits.
Hi Charlie, What I should have said is number format and not units. When I was out in the field around 10 years ago and mostly used Leica Total Stations and say for example I wanted to enter a Prism constant of 25mm. We all know that in metric units this is 0.025mm yet the instrument only required you to enter a whole value of 25 and that was it. I'm almost certain from what I can remember that the entry for scale factor is set up in the same format for this particular instrument. I'm not too sure how it is for other instruments and the word units means to me the following: millimetres centimetres and meters as I've never really had to use feet and inches before.
We do still have that problem with old English feet and inches which is still used by Earth works firms. They'll talk to each other in meters for bulk earthworks until it comes to final trim and then everything is spoken in the language of inches :-)