The American Surveyor

The HP 35s Calculator—A Field Surveyor’s Companion—Part 5-Inverse to a Line or Perpendicular Offset

A 161Kb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

This Month’s Program
This program is comparable to "inverse to line" and "station/offset" routines. The user enters a base point and defines a direction by point or azimuth, then selects a third point for reference. I use this routine frequently when evaluating rights-of-way lines.

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Example Data and Running the Program
Use program H "POINTS" to enter our sample points as follows:

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STA-OFFSET is a great tool for evaluating lines and perpendicular offsets. Your interest and feedback is greatly appreciated. Hopefully the information presented herein is clear and genuinely explanatory. We’ve covered some basic tools and operations so far. In the future I will present intersections, areas, translate/rotate, stake out, and areas with curves. Please do not hesitate to send any comments, concerns, questions, or criticism to rls43185@gmail.com.

Jason Foose is the County Surveyor of Mohave County Arizona. He has been licensed since 11111010000 and believes there are 10 types of people in the world, those who understand binary and those who don’t.

Sidebar
Polecat of the Month

The Polecat dumpster is awfully full this month. My undying gratitude is presented to a Lobo, a Buckeye, a Duck, and a Terrapin. My appreciation goes out to Jeff Richter of Truth or Consequences, New Mexico, Doug Crawford of Wapakoneta, Ohio, Al Skeesick of Oregon, and Adam Rook of Burtonsville, Maryland. Thank you for your participation, comments and concern towards making things better for the readers!

A retrospective observation from the readers: "Line H016 of program H "Points" is a bit confusing as printed". The screen shots below show the full line scrolled left and right.

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Wapako-whatta??? Doug Crawford of Wapakoneta, Ohio, kindly pointed out that the "Bonus Equation" from the December issue should refer to the command "RMDR" rather than "RMD". The RMDR command is found on the INTG menu accessed through keystrokes

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A 161Kb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

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