I am using LIDAR ASC files to generate a large storm water catchment area which I would like to then combine with some survey work including river bathymetry to actually combine the data to have one complete surface file so we can complete a flooding model of our at risk coastal foreshore communities. Our survey work is in A3D and our flood modelling software (XPSWMM) prefers ASC file types, my problem is exporting from AutoCAD 3D and getting the file into a ASC file type.
Once I get all the files into an ASC format I have no issues about combining the files together. I just can't figure out how to get from A3D to asc file type! I am just getting frustrated now! I know it should be simple, we are using two leading software packages and there seems to be no easy transfer of data.
Software I have at my disposal to achieve this is; A3D, FME (limited experience), MapInfo with engaged 3D extension, XPSWMM.