Update README.md

NCALM-UH · Jul 23, 2020 · cb1d4a5 · cb1d4a5
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 # AddHeader
 Add header info to a LAS file using PDAL.
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+### Add Header Value Notes
+- "forward":"all" will retain all header information from the existing file, including LAS minor version. Additional options will overwrite forwarded values.
+
+### Add Channel Number Notes
+- "UserData=>ScanChannel" will copy scanner channel information from User Data to the Scan Channel field. TerraScan (which NCALM uses) doesn't add Optech Titan's channel number to the official LAS 1.4 channel field.