Copying measurement using Pointcloud2

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Hi there,

I have a Pointcloud containing 200 measurements, where every measurement contains 4 values (x,y,z coordinate and intensity). Basically, I want to split my pointcloud into two new pointclouds, one containing all measurements with x > 10 and one containing all measurements with x < 10. (Each measurement should consist of x,y,z and intensity). However, I have not found an elegant way to do this, apart from reading and writing every of those four values on their own. Does anybody know some kind of a "CopyThisMeasurement" function to do this?

Thanks in advance!