Rami Tamimi’s Post

Transcript

Now, as many of us know, the new inlet reach RS3 has a built-in IMU for tilt compensation. But the question is, is there a direct correlation between the tilt angle at which we hold our pole and the amount of error that we can expect in comparison to holding the pole plum and getting our coordinates traditionally? Today we're going to find out. And we are fixed and our aim is initialized. So we're connected to our RS3. Here's our site. I'm going to add a point. And we're going to ensure that we are only taking observation on fixed points with a tilt compensation enabled. Everything looks good here. I'm going to Plumb the pool for our first point save. OK, we're going to tilt just a little bit. Let's save. Tilt a little more. Save. Tilt a bit more. Save. Keep going, save a little bit more. Save. Ohh wow my back is hurting. Save. This is getting real real bad here. Save. I don't understand. We still have a fixed reading in our till compensators working save or go a little bit more save Oh my God. About to go completely horizontal here Save. There's no way this is going to work Save and we are officially touching the ground save not making this up. But it says that we still have a fixed reading and our till compensation is good. So let's head inside and analyze this data. So here are all of the points projected in State Plane Coordinates, any D 83, Michigan, South International feet. We will convert all the results to metric at the end of the video, and here we have the tilt angle starting at roughly 0�� and going up to almost 90��. This first graph shows the plot of the XY coordinates, and we can see here at point #1. As we continue to increase our tilt angle, we are gradually increasing the difference between the plum pole and the various. Little angles and the axis. We do see the first couple of points maintaining the elevation, but as the tilt angle increases we are losing that accuracy. Here we have a direct difference XY for every single one of these points in relation to point #1. So if we look at the elevations, they are decent on what you would expect from GNSS with a couple of points that I think have more error than I'd like, reaching about 2 1/2 tenths or about 7 1/2 centimeters. The northing or the Y component. Was very consistent, reaching U to a tenth or three centimeters, and the X component, which is probably the direction in which the tilt was occurring, reached half a foot or 15 1/2 centimeters. This does look linear as this error is increasing gradually as we're increasing our tilt angle, and the graph here tells the same story, especially in the X direction or the easting. As we increase the angle, so does the differences between the plum pole and the tilted angle. Finally, we calculate the. RMS using our XY coordinates. I've also converted them over to centimeters and these are the tilt angles that were used for each of the points. And I've graphed the RMSE to the tilt angle. And yes, we do have somewhat of a linear path. I've drawn in a line of best fit for us to see what the projected error is now based off of my one singular task. So based off of this graph, I anticipate that if you hold the rod at 45�� you are going to get about 3/10 of error. Or 9 centimeters. If you're trying to keep your accuracies within one, or 2/10 which is under 6 centimeters, then I would not go over 30��. And if you do put the pole flat down on the ground you can anticipate just over half a foot of air, or about 17 centimeters. If you like these types of videos, please leave me a comment on this post. If you'd like to learn more about surveying and geospatial technology then be sure to check out my YouTube channel and subscribe.