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Question

Decoded an encoded polyline

  • September 13, 2014
  • 4 replies
  • 193 views
M
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Hi, I'm still quite new to FME and I'm trying to figure out how to decode an series of polylines that were encoded using the Google Encoded Polyline Algorithm Format.

https://developers.google.com/maps/documentation/utilities/polylinealgorithm

 

 

The encoded polylines are currently stored in a CSV file and I am using the GeometryReplacer to decode the encoded polyline which appears to work when inspecting the results for the IFMEline coordinates, however the geometry shows up as a straight line. I'm not sure if I need to perform further transformation to decode this correcty. Any ideas?

 

 

 

4 replies

takashi
Influencer
  • takashiInfluencer
  • September 13, 2014
Looks like a straight line, but you can see that there are many vertices if you look at the Feature Information window of Data Inspector. Are the coordinates wrong?
M
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  • mkov
  • Author
  • September 13, 2014
Yes, the coordinates are correct. I've compared the decoding using the Google Polyline Encoder/Decoder tool. https://developers.google.com/maps/documentation/utilities/polylineutility

 

 

I am expecting a polyline South to North.

 

 

 

 

gio
Contributor
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  • gioContributor
  • Contributor
  • September 15, 2014
Hi,

 

 

I trie it out.

 

 

according to description it is LL, so in my case as i live in Holland i needed to use reprojector to reproject to RD_new.

 

If i do the shape looks like in the Google Api, if dont it does'nt (of course)

 

 

So u need to use Reprojector on it.
gio
Contributor
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  • gioContributor
  • Contributor
  • September 15, 2014
addendum:

 

 

I also noticed that you need to use chopper and then linejoiner to join them.

 

 

In my case i made a (supposedly) closed line (to use by areabuilder) in the Google API, but it would not form an area.

 

Only after chopping to 2 vertices and subsequently Linejoining it formed an area. (no snapping required)

 

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