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NeighborFinder and Distance

  • November 13, 2013
  • 7 replies
  • 39 views
A
Hallo everyone,

 

 

will be great, if you could help me with my question.

 

i have 2 Shapes with coordinate system WGS84 both. if im trying to find a neighbor, i get the distance in grad...

 

 

To find a distance in meter with NeighborFinder i need to reprojekt this coordinate system in UTM Zone 32 or Zone 33. This is my problem, because i have in each shape-File both Data from Zone 32 and 33. But by Reprojektion i must give only one of them. Do you know, what can i do?

 

 

Or is it possible to find a distance in Meter without changing the coordinate system?

 

 

Thanks for your help!

 

Best answer by david_r

Also, have a look at the ReprojectLengthCalculator, I think that might be what you're looking for.

 

 

David
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7 replies

david_r
Celebrity
  • david_rCelebrity
  • November 13, 2013
Hi,

 

 

there is a LengthUnitConverter in the FME Store, perhaps it can help?

 

 

Also, make sure that you specify the coordinate system on all your Readers.

 

 

David
david_r
Celebrity
  • david_rCelebrity
  • Best Answer
  • November 13, 2013
Also, have a look at the ReprojectLengthCalculator, I think that might be what you're looking for.

 

 

David
A
  • annachuk
  • Author
  • November 13, 2013
Thank you David,

 

bei  ReprojectLengthCalculator i need again give the coordinatesystem in which the distance should be count. so i need again to put UTM Zone 32 or Zone 33... what do you think?
fmelizard
Safer
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  • fmelizardSafer
  • Safer
  • November 13, 2013
HI,

 

 

Devide your features to two coordsys streams, each one with its own  ReprojectLengthCalculator.

 

 

Itay
david_r
Celebrity
  • david_rCelebrity
  • November 13, 2013
Hi,

 

 

that will depend on your data. Both UTM-32 and UTM-33 are in meters, but be aware that you may introduce errors in the reprojected length the further outside the respective UTM-zone your feature is located.

 

 

This means that if you have a feature that is geographically located squarely in UTM-32, you may get slightly different lengths if you use UTM-32 and UTM-33 ans the source coordinate system. This is because UTM zones are only guaranteed a certain precision for features within the zone itself. See here for more info.

 

 

You will have to consider the data and experiment to see which solution gives the best results depending on the demands of precision in your project.

 

 

David
david_r
Celebrity
  • david_rCelebrity
  • November 13, 2013
Just to add: Itay's suggestion is a good one.

 

 

If necessary, consider using a CoordinateSystemExtractor to do the split.

 

 

David
A
  • annachuk
  • Author
  • November 13, 2013
Super!! Thanks guys! it works with Splitting and ReprojectLengthCalculator.

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