[R-sig-Geo] How to filter a xyz vector file

[Ashraf Afana]

Hi friends, 

I have a xyz vector file from a terrestrial laser scanner that contains a huge amount of points at a high resolution (approximately 15 mm). I need to reduce the amount of point in the file by selecting N number of points each certain distance (i.e. generate equidistant spacing). I was looking at the available libraries in R (sp, rgdal, etc.), but I was unable to find a function to do so. Any suggestions?

Ashraf, 
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