Is there any procedure to automatically correct lidar classification? My LAS Dataset has water listed as ground and buildings listed as vegetation.
Just wondering if there is any option to fix this.
Are you sure that your data is ASPRS compliant? It doesn't sound like it is. Codes are listed in the spec (page 8) and also here, this is an older version but the latest is a little difficult to find. The class codes haven't changed since 1.1.
The tool is Change LAS Class Codes (3D Analyst). This will blanket change codes from X to Y, so in your case water (9) to ground (2).
Be careful of the order of change: if you change 9 (water) to 2 (ground) and then 2 (ground) to 6 (buildings) then all of your ground is now building. You will need to find an empty class to go first so that you don't double up.