I am new to UAV LiDAR processing and I´m running into a problem when creating a DSM from a L1 point cloud.
The DSM ends up with "lines" or "steps" between flight lines. See pictures below. Is it a problems of flight parameters or sensor calibration?

Sorry if it is a dumb question, I have not found anything on the web.

It appears to be a DSM from an unfiltered RAW point cloud. The difference should not be huge. You are misled by the shading which is very strong. Look at the pure data raster with QGIS and you will know. Otherwise send it to me via Google drive or something, I'll take a look.

See my reply on this thread.  
Strange traces in point cloud
I explain the problem and describe the solution I have figured out.