Preprocessing is required if the lidar data is not formatted, as described in Data sources and formats. Examples of data that will require preprocessing include the following:
- Data not in LAS or zLAS format (for example, ASCII).
- Unclassified data, or data in which classification accuracy is poor.
- Data in which the coordinate system is not as stated (for example, XYZ values in Earth-Centered, Earth-Fixed (ECEF) coordinates).
For these cases, it may be advisable to work with your data provider to reprocess or convert the data to meet these requirements.
Also consider converting LAS files to optimized zLAS format, which will resequence and compress the data and includes a spatial index to enable faster access.