The Missing Line Routine is a popular feature of TruPulse laser rangefinders. This built-in measurement option allows you to capture a variety of data using the measurements between two points. We’ve learned that there may be some confusion on the difference between a 2D Missing Line routine and a 3D Missing Line routine. Keep reading to learn when to use each of these versatile measurement options.
Both measurement routines follow a simple two-shot cadence, with Shot-1 taken to the first target and Shot-2 to the second target. The 2D Missing Line routine’s calculations are based on distance and tilt-angle measurements. As a result, most results from the 2D Missing Line routine require that both targets be aligned in the same direction. Every TruPulse model can perform a 2D Missing line routine.
Meanwhile, only the TruPulse 360i and TruAngle II products can produce a 3D Missing Line routine, with calculations that add either an azimuth bearing or a turned horizontal angle into the mix. With that additional data included in Shots 1 and 2, the 3D Missing Line routine allows you to measure between any two points, regardless of their relative spatial positions.
The TruPulse 360i, TruPulse 200i, TruPulse 200x, and TruPulse L2 all come ready to measure 2D Missing Lines. The same is true for legacy TruPulse rangefinders. Why? Beginning at the initial product launch, every TruPulse rangefinder has come equipped with both a built-in tilt sensor and a laser sensor. These two elements work in tandem to make the 2D Missing Line (ML) calculations.
The 2D Missing Line routine allows TruPulse users to gather measurements between two spatially aligned targets.
The 2D ML routine allows you to measure distances and inclination between two remote points. While both targets must be aligned in front of you, target 1 can be closer or farther away from you than target 2. Within these positional requirements, you can use the 2D Missing Line routine to reveal the:
* Targets do not need to be aligned for the 2D Missing Line routine to produce accurate Vertical Distances from Point 1 to Point 2
The most popular applications for the 2D ML routine are measuring heights and overheard clearances, line sag, and checking the grade of a slope. Just take Shot-1 at the target object’s base, take Shot-2 at its top, and scroll to the Vertical Distance (VD) result, or the % Slope result if you are checking for grade.
The TruPulse 360i comes equipped with a built-in 3D Missing Line routine, making it the most efficient option.
Currently, only the TruPulse 360i laser rangefinder includes an exclusive built-in 3D Missing Line routine. An interior compass sensor adds azimuth bearings to Shots 1 and 2, removing any need for the targets to be spatially aligned. Just take Shot-1 to the first target, pivot as needed, and take Shot-2 to the second target. Along with allowing you to measure between any two targets, a major advantage here is the super quick point-and-shoot cadence.
Pay attention to the potential for local magnetic interferences, which can affect the accuracy of your compass bearings and Missing Line results. Performing regular compass calibrations and maintaining minimum distances to risk objects are two great ways to practice “magnetic hygiene” and stay accurate. This is the most efficient way to capture 3D Missing Line measurements.
Wirelessly pairing a TruPulse 200X with the MapStar TruAngle II angle encoder is the most accurate way to perform a 3D Missing Line routine.
There is an alternative that removes any risk of magnetic interference: wirelessly pair a TruPulse 200i or TruPulse 200x with the MapStar TruAngle II angle encoder. This will add turned horizontal angles in place of measured azimuth bearings. This two-device setup also provides the highest possible accuracy for both your Shot-1 and Shot-2 measurements and the Missing Line results they produce. The cadence is marginally slower than simply using a TruPulse 360i, and you’re using more gear. But, at the end of the day, this is the most foolproof and accurate way to capture 3D Missing Line measurements.
There are no spatial limitations to be aware of between Shot-1 and Shot-2. This creates a seemingly endless number of applications. Everything a 2D Missing Line routine can calculate is still on the table. Refer back to the “What data will a 2D Missing Line reveal?” section for this info. Additionally, you can also measure for:
The 3D Missing Line routine allows TruPulse users to gather a variety of measurements between any two points.
We hope this article provides a better understanding of how and when to use each type of Missing Line routine. Check out our Professional Measurement YouTube channel for educational videos about our products. We are always ready to help! Please contact our team with additional questions.
Don't want to miss out on future updates? Subscribe to our blog for the latest news, trends, and expert insights from LTI. Head on over to our subscription page to sign up today!
Sign me up!