Maintenance

If an existing data collection is updated (for example, USGS releases a new version of the NED 1/3 arcsecond data) and the new source data files exactly match the existing file names, the new source files may replace the prior version with no other changes required. Since the mosaic dataset references files on disk, data content will be read from the new files.

When a new data collection is added to the system, do as follows:

• Create a new source mosaic dataset as defined above.
• Complete appropriate quality control (QC) procedures, then do one of the following:
  • Add the new source mosaic dataset into an existing derived mosaic dataset using the Table raster type.
  • Presuming automated processing scripts have been implemented, add process commands for the new source mosaic dataset to the automated build process, and rebuild the entire derived mosaic dataset.
• If a new data collection is added to the system that is outside the current boundary of any existing datasets, the Build Boundary tool should be run.
• Note that the referenced mosaic datasets are automatically updated, so nothing needs to be rebuilt.
• The overview may need to be rebuilt for the source mosaic dataset. In general, no other overviews will need to be rebuilt.