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Question

How to change scanner_channel for only specific source_id in multiple las files?

  • August 25, 2023
  • 1 reply
  • 15 views
B

Hello,

I have numerous las v1.4 pdrf 7 tiles from a dual channel airborne lidar sensor - there are multiple source ids (flightlines) in each tile, and most have the scanner channels coded correctly as 1 and 2.

 

One line however has the scanner channels coded as 0 and 1. Is there a way in FME to go through all of the tiles and only change the scanner_channel for a particular source_id?

 

I would envision a script running through all of the files, then at any instance where the source_id matches a user defined value (the flightline with the problem), then it would change then scanner channel from 1->2 or from 0->1 while retaining all the other non-matching points, and all other parameters such as classifications.

 

Thank you for any tips or suggestions,

Ben

1 reply

danminneyatsaf
Safer
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  • danminneyatsafSafer
  • Safer
  • 485 replies
  • September 5, 2023

When you read in the LAS file, can you see the scanner_channel as an attribute in the Feature Information window when you inspect a row in the Visual Preview window? If so, then a Tester would be sufficient for filtering for a particular source_id, after which you could change the scanner_channel attribute value and then rejoin it with the other set of features.

If you're able to share a sample las file or your workspace that you have so far, this would help us a lot to get some more context.

 

Dan


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