Survey Traverse
I want to show you how you can use the surveying total station to
perform a traverse around several points and calculate the coordinates of those points.
Now a surveying traverse uses the bearings and distances between points to calculate how far away
a point is and by using how far away the point is can then calculate the coordinates of that point.
The total station is set up on every single one of these points and we're observing the back sight
to the point previous to it and the foresight to the point after it these multiple setups will help
us find the difference in distance between the points as well as the direction in where they are
located, or the azimuth or bearing of the point. This video is going to be comprised of three
parts.
One: we're going to be traversing around our control network so that we can calculate the
coordinates of all of our points. Two: we're then going to find the differences between these points
by calculating the latitude and the departures or the change in y and the change in x respectively.
Third: we're going to calculate the northings and easting coordinates of all of our points.
Now I know in the last video, I actually gave you these coordinates, so we can use them as check
this time for now. We're only going to assume one known location and that's this point. Do
you guys remember this point? This is where we had the total station set up from now on
this point will be referred to as reference or REF. This is the only point that we're going to
have coordinates for because we calculated it in the resection. Now we're going to be traversing
around five points and referring back to that reference point to calculate the coordinates of
all five points. Allow me to introduce to you the control network. We're gonna start out by
setting up on pink then we're gonna set up on green. Now I set a new point called red, so we're
going to be setting up on red then we're going to set up on blue then we're going to set up on
orange and then finally we're going to come back and set up on pink. Alright let's get started.
The plan is we're going to start by setting up on pink, then we're going to back sight the
reference point and then foresight green after foresight green, we will then move the instrument
set up on green, foresight red ,back sight pink then set up on red, back sight green
foresight blue, then set up the instrument on blue. Back sight red, foresight orange,
then set up on orange. Back sight blue, foresight pink, and finally we'll then set up again on pink
back sight orange, and foresight green. There's a bunch of setups required and a lot of moving,
but trust me when you're done you're going to have the ability to calculate
all of these coordinates based on one reference point.
Now if you don't know how to set up a survey total station, what I'm going to recommend you do is
check out one of my older videos about setting up a total station. I go through leveling it,
setting it up, over the point and ensuring that you're going to get proper accuracy. I recommend
you watch that because I’m not going to be going over that in this video.
Okay so we're going to
start out by back siding our reference and that looks to be good. All right, in the resection
video I kept referring to this distance, this is the slope distance you actually need to be
recording the horizontal distance which is this bottom one, since the slope distance accounts for
elevation and we're not measuring elevation right now. So make sure you record the HD,
horizontal distance and since this is our first point and we're back sighting it, we're going to
go ahead and set zero. All right now we're going to be taking a foresight on our point green
all right so our distance is 52.865 and the horizontal angle is 67 degrees 11 minutes
and 46 seconds. All right, now it's time to pick up the instrument and go set up on point green.
All right now we're gonna back sight pink.
All right here's what we got. All right so our distance is 52.7
feet and this is our back side, so we're going to go ahead and zero out our angle.
All right now we're going to go ahead and measure our new point red.
Okay so our horizontal distance is 31.945 feet and the angle between pink and red is 67 degrees 11
minutes and 07 seconds. Alright, let's tear down the instrument and move to point red.
So all right, now we're going to back sight green. All right our distance is 31.910, and since this
is a back sight we're going to go ahead and set zero. Now we're going to measure blue.
Alright so the distance is 19.01 feet and the angle is 217 degrees 30 minutes and 40 seconds,
let's set up on blue.
All right now we're gonna back sight red.
Okay and the distance is 18.99 feet we're going to go ahead and zero out
our angle because this is our back sight. All right and now we will foresight orange,
okay and measure. All right here we go horizontal angle of 88.640 feet
and our angle is 69 degrees 58 minutes and 08 seconds. All right let's set up on orange.
Okay, that looks good now we're gonna go ahead and back sight blue.
All right, so our distance is 88.535 feet and this is our back sight so we will set
zero for our angle. All right and now let's measure pink.
And our horizontal distance is 58.93 feet our angle is 45 degrees 0.3 minutes and 13 seconds.
One last setup we're going to set up on pink back sight here and foresight green, let's
Go.
Okay now we're going to backside orange,
and we have we have a horizontal distance of 59.01 feet. We'll go ahead and set
zero and now our last and final reading a foresight on point green.
And we have a horizontal distance of 52.815 feet and an angle measurement of 136 degrees
40 minutes and 59 seconds. All right that's it.
survey traverse calculation