Hi, my name is Rami Tamimi. And today we're gonna be
By figuring out how far your distance is in feet using pacing, you can then determine distances
between points using pacing. The idea of pacing is counting how many paces you take between two
points. Using the number of paces that you have taken, you can then calculate the difference
between those two points. You're probably wondering, what's considered a pace? It could
vary. It could be every step you take. It could be every two steps you take. The point is, a pace
should be the natural steps that you take when you walk. Now for this experiment, we're going
to be doing every single step. However, there are demonstrations of pacing where it's every two
steps led by your dominant foot. This is really confusing. I don't like to do this so we're just
gonna do every step. It still works. I promise. Don't worry. There are three simple steps that
you must take in order to have an accurate pacing measurement. Number-one one, you need to calibrate
your paces. By having a set distance, usually this is one hundred or two hundred feet, and pacing
that one or two hundred feet, you're able then to figure out how many paces are in a given distance.
You should do it several times so you have a sample of data to work with.
If your steps are varying from more than two paces for the same distance, you might want
to repeat this and make sure your speed is the same and that your difference between each pace
are the same. The second step after you've done the calibration and figured out what your pace is,
you're gonna go ahead and pace between set points. Now these points should have a distance measured
with some other instrument so that you can compare your paces to them. By doing the pace around
these points, you're then able to calculate how accurate your pace is. And finally number three,
we're gonna go ahead and take all that information, bring it into the office,
and calculate what those distances are using our paced measurements. We'll then find the error in
relation to the difference between the actual difference between these points and in return
we should be able to figure out how accurate our pace is. One part in what. Remember you want to
aim between one part in fifty feet and one part in a hundred. That's typically the accuracy you'll
gonna do now is calibrate our pace. In order to do this, we're gonna use a two-hundred foot tape.
Now, you have to figure out how many paces you have in a given distance. The distance that we're
gonna use is two hundred feet. Because this is a two hundred foot tape. It measures out in tenths
of a foot. So we'll just keep pulling until we get two hundred feet. What we're gonna do is pull it
from right here and we're gonna take it all the way down to the end of the yard. What we're going
to do now is we're gonna take a chaining pin like this one and we're gonna use it to drive the tape
into the ground so that we can start measuring. [♫Music♫]
Okay. Let's go ahead and measure our
two hundred feet. [♫Music♫]
And we're gonna go ahead and probably get to the end of our tape here.
And it looks like we have -- all right. So we're at two hundred feet. Now what we're
gonna need to do is set this on the ground and we're gonna put another chaining pin
here to indicate where the two hundred feet lie. There we have our tape all set up and
the two chaining pins are exactly two hundred feet apart. We can begin calibrating our pace.
Okay. So now, I'm gonna go ahead, start out at zero
and we're gonna work our way down to two hundred feet. Ready? Here we go. 1-2-3-4-5-6-7-8-9-10.
68, 68, 70. 71, 72, 73, 74, 75. I've taken 75 paces in two hundred feet.
So now the thing is, you don't want to just stop here. Yeah, you've done the calibration
test and you know you've got 75 steps in every two hundred feet. However, it's very important to
do this multiple times. That way your accuracy is gonna go up because now you have multiple samples
of this test. We're gonna go ahead and do this three more times. We're gonna go ahead and
walk all the way back, come back here, for a third time and then I'm gonna return back
The second time I did this, I got 76. The first time I got 75. This is why we do this
multiple times, so that we can average our paces. All right. Two more times.
1-2-3-4-5-6-7. 51-52-53-54-55
41-42-43-44-45. Okay here are my results.
For the first run, I had 75 paces for every two hundred feet. For the second
run I had 76 paces for every two hundred. For the third run I had 77 paces for
every two hundred feet and for the fourth run I had 76 paces for every two hundred feet. That
means after trying this four times, my average pace for every two hundred feet is 76 paces.
So we're gonna use 76 paces to calculate how far of a distance we are between three points.
All right. Now it's time to pull everything out and start measuring
between points. [♫Music♫]
[Dog
barks in
background] [♫Music♫]
All right. So I went ahead and I set three points.
I set a green point. I set a blue point. And I set an orange point.
Now these points are quite a bit apart but what we're going to do is pace between them to get an
estimate of how close they are to each other. [♫Music♫]
I'm gonna go ahead and take the liberty and measure between these points using my tape.
So that we have a baseline to compare our pace measurements to a tape measurement. And
this will help us calculate how much error we have in our pacing. And we're going to do this
clockwise from green to orange, orange to blue, and blue back to green. I accidentally left out
a very important detail. After going forward between all of the points, we then need to pace
backwards going from green to blue, blue to orange and orange back to green. I did this
in the field but I never recorded it. After we have collected our data,
we can then bring it into the office and using our pacing, we're gonna figure out how many
feet are between these points and compare that to the measured distance that we got with our tape.
1-2-3-4-5-6-7-8-9-10 29-30-31-32-33-34-35-36-37-38-39.
1-2-3-4-30-31-32-33. 1-2-3-4-5-11-12-13-14-15-16-17-18-19.
All right. That's it. That is the field collection for our pacing experiment. Let's head inside,
figure out what our error is going to be. As we had mentioned in the calibration, in the first
attempt, we got 75 paces. In the second attempt, we got 76 paces. In the third attempt, we got
77 paces. In the fourth attempt, we got 76 paces. That means we average approximately 76 paces
per two hundred feet. That means on average if we're taking 76 paces every two hundred feet,
our scale factor is going to be 2.63 or for every pace that we're taking, we're traveling 2.63 feet.
So this is very important because it's what we're going to use to convert between paces and feet.
So let's go and take a look at the amount of paces that we took between the three points.
So when going forward between green and orange, we went 39 paces. We went backwards 40 paces and
that gave us an average of 39-1/2 paces. Between orange and blue, we traveled both forward and back
33 paces. So that means our average is 33. And between blue and green, forward we went
19 paces. Backwards we went 20 paces. So our average is gonna be 19-1/2 paces.
Okay, so to get the distance, we're going to need to multiply our paces by the scale factor.
Remember that 2.63 number that we got earlier? So in doing so,
our difference between green and orange is 103.95. The difference between orange and blue is 86.84.
And the distance between blue and green is 51.32.
Okay so here are the true distances that I measured. So I use the tape to do this. So
I measured this to the nearest tenth of a foot. Between green and orange I was getting 102.5 feet.
Between orange and blue I got 85.6 feet. And between blue and green I got 50.6 feet. So now
we gotta take the difference between the true measured and the calculated measured
through pacing. Between green and orange I got a difference of 1.45. Between orange and
blue I got a difference of 1.24 and between blue and green I got a difference of 0.16.
That's pretty good. All right and now with these differences we're able to calculate the accuracy.
So now to calculate the accuracy, we're going to be taking the true distance divided by the
difference and it looks like here between green and orange our error is one part in 71 feet.
Our error between orange and blue is one part in 69 feet. And the error between blue and
green is one part in 71 feet. That means our overall error for the entire project
was one part in 70 feet. In order to ensure that you did a good job, you need to be above