Author Archives: Dave

VDOT Work Zone Safety Training

In accordance with Virginia Department of Transportation, Traffic Engineering Division Memorandum TE-345, available here ( Which was issued to comply with the Federal Highway Administration regulations set for in 23 CFR 630 Subpart J, §630.1008 State-level processes and procedures, paragraph … Continue reading

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Least Squares Trilateralization – 2D

Trilateralization is basically a distance-distance intersection using two or more points and corresponding measurements from them to an unknown point. Working with just two points can yield 0, 1 or 2 solutions. Case 1: No Solutions Given Two points with … Continue reading

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A Great Calculus Site

While writing the next least squares post I needed to review some calculus and in doing so I found a great site to refresh my memory Visual Calculus

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Conformal Geometric Least Squares

I expect this to be the first in a series of articles detailing geometric least squares. By geometric least squares I mean fitting measurements to equations, or coordinates to equations or a combination there of. Getting started we will assume that … Continue reading

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Weighted / Non-weighted Quadratic Curve Fit to Point Set

While reading Walking Randomly yesterday, I came about this post on polynomial fitting with MATLAB, which went along with something I was working on in MathCAD and the next thing I new I worked the problems long hand, figured I … Continue reading

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