I’m trying to combine LiDAR from two different sources into one file using the mosaic function. I then need to convert the resultant file into ascii format. I’ve been trying to do this in Arc using the mosaic function, before I export it to other software to build a ground model and carry out the hydraulic computations that are needed. The problem is that the ascii file I end up with is enormous, around 50X the size that I was expecting. Can anyone please let me know what might be going wrong?