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Tips for Encoding Large Mosaics

As you add more tiles to a mosaic, performance becomes increasingly important. The following list provides some advice on encoding performance for mosaics:

• Change the encoding options for strip height and block size for faster encoding on machines with more memory. As a rule of thumb, you can create mosaics up to 500,000 pixels in width if you set the strip height to 12 and the block size to 64 on a machine with 2 GB of RAM. For more information see Calculating Memory Usage.
  1. Strip height. Set a higher strip height for faster encoding but more memory usage. For more information, see Strip Height.
  2. Block size. Set a lower block size to use less memory. However, selecting a lower block size will result in a lower quality compression. By default, the block size is set to the maximum of 64. Do not change the block size unless you need to restrict memory usage. For more information, see Block Size .
• Create mosaics in a single job even when there are many input tiles. It takes longer to encode many small mosaics and then encode the small mosaics into one large mosaics. If you need to create both small mosaics and large mosaics, create one large mosaic first, and then create tiles in the Job Options.
• Work from uncompressed images when possible. If you want to perform multiple image manipulation operations on a mosaic, perform the image manipulation operation on the uncompressed input tiles. Many image manipulation operations that you perform on a compressed mosaic decode the mosaic first, perform the image manipulation operations, and then compress the mosaic again. Exceptions to this rule are crop operations, resampling operations, and composite mosaic operations for the MrSID Generation 3 and Generation 4 formats.