Challenge #77: Extending Spatial Lines

[Karam]

Nice challenge :)

[JoshuaGostick]

My solution :)

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[cplewis90]

This was a fun challenge to use the spatial tools and create an app on top of them! I almost did it incorrectly as I missed the 5 miles "on both sides". I was thinking extend it in one way and then didn't match the answer. Gotta read all the directions more!

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[princejindal]

Great challenge to creatively use the trade area tool and the smooth tool, thanks!

[OllieClarke]

I found this one quite tricky, spent a long time trying to match up the angles of points without success.

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[Kenda]

Spoiler

Thought my approach may be a little unconventional, but looks like others had very similar workflows!

[DawnDuong]

I used a geometry-based solution.

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[TonyA]

I struggled with this one for hours. I first came up with a trig based solution, hoping that the curvature of the earth wouldn't affect the results too much, but once you extended the line by more than about 50 miles the differences became really significant. I attached a workflow anyway just for fun. Some more thoughts in the spoilers:

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I was thinking about using trade areas, but didn't know understand the polysplit tool. Thanks to @gnans19  I was able to understand it and came up with a slightly different approach to solving the problem with trade areas. But this still doesn't work for very large extensions. Once the amount you are extending the line exceeds about 30 times times the length of the original line, the distance between the endpoints of the line becomes insignificant and the trade area is essentially a circle around the endpoints.. At that point there will be multiple "nearest points" and the algorithm falls apart.

[TonyA]

Did you ever come up with a trig solution that worked? I posted one, but it starts to deviate really quickly as the extensions get long because we can't use planar geometry rules on a curved surface. I think you can do some amount of correction but it won't work for very long distances.

[KMiller]

Solution attached.

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