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Identifying Large Deflection Angles

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Software, CAD & Mapping

Last Post by jitterboogie 5 years ago

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john-putnam

(@john-putnam)

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Does anyone know of a way to identify large deflection angles in a polyline.?ÿ I'm trying to find jagged blips in what should be fairly smooth polylines generated by continuous RTK/TPS shots.?ÿ The cleanup tools in AutoCAD will let me find angles smaller that a given deflection but not larger.?ÿ At present I'm doing a visual inspection, the lines are typically 300+ m with upwards of 1500 vertices which makes that a real pain in the ......

Posted : December 30, 2021 10:11 am

Norman_Oklahoma

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Somebody who was clever with LISP could throw together a routine that would march down the line calculating those deflections and building a report.

How about this - annotate the segments with bearing calls, then build a line table. Export the line table to a text file by some means - perhaps by printing to pdf and then OCR'ing the result. Open the text file in Excel and build a formula.?ÿ ?ÿ ?ÿ?ÿ

?ÿ

Hmmmmm...... thinking ....... thinking ......

If you could get the coordinates of each vertex of the polyline and import those to Excel you would be halfway home. You could compute the bearings in Excel and do the math on the deflection angles from there...... Perhaps you have those coordinates in the form of RTK data already??ÿ ?ÿ?ÿ

Posted : December 30, 2021 10:28 am

half-bubble

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http://tcicorp.com/ probably has what you want in their maptools package.

Posted : December 30, 2021 11:39 am

jitterboogie

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ESRI might have a tool to rasterize a data set from your collection of data.

Not sure about individual deflection angles.

Are they collinear or just weird data points randomly occuring?

This is a great thing for GIS to tackle.

Posted : December 30, 2021 12:29 pm

jpb

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I would convert the polyline to an alignment. You can then print a report and include deflection angle in the report or set up the alignment to label the deflection angle.

?ÿ

Posted : December 30, 2021 1:00 pm