lasmerge header behavior question

[Andrew Johnson]

Hello,

If I understand correctly, the first file given to lasmerge decides the LASheader contents for the entire merged file. For example, when merging these two files with "lasmerge -i FileA.las FileB.las ...":

FileA.las: XYZ, intensity

FileB.las: XYZ, RGB, intensity

The merged output will not contain any RGB data, because the headers from FileA.las are used to determine which attributes are written to the merged file, and FileA only has XYZ and intensity attributes. On the other hand, if one were to reverse the order of the filenames specified to lasmerge ("lasmerge -i FileB.las FileA.las ..."), the output would indeed contain RGB data. Understandably, only the points that were originally associated with FileB.las would have usable RGB data. In summary, by passing file with all the attributes to lasmerge first, you can ensure that as much input data as possible is preserved in the merged file.

However, one may want to merge the following set of files:

FileA.las containing XYZ, Intensity

FileB.las containing XYZ, RGB

FileC.las containing XYZ, Intensity, Classification

In this case, it's not possible to specify the file with all of the attributes first, since no single file has all of them.

Is there any solution to this problem?

Thank you,

Andrew

[Rainer Wiesenfarth]

Hi Andrew,

creating an empty dummy file containing XYZ, Intensity, RGB, Classification and using this as first input might be a workaround?

However, I did not check if this works, this is just a theory...

Cheers, Rainer

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