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GeoExpress - Knowledge Base Articles

A060301 - Long encoding times

Products:

GeoExpress

Summary:

GeoExpress sometimes takes a long time to encode imagery.

Cause:

There are a number of factors that may slow the encoding rate:

  • Input images may be in 1-bit black and white or indexed color mode, or highly compressed. Such images may show a small file size on disk, while having considerable width and height. The width and height of the image, rather than the file size on disk, determine the size of the image processed by GeoExpress.
  • If the images are accessed across a network, the connection may slow the encoding process. Check the network connection. If possible, store the input images locally.
  • When encoding mosaics that are composed of non-contiguous image tiles with a large area of null data, GeoExpress may slow significantly.
  • The images may be JPEG, LZW, pack-bit or run-length compressed. JPEG- or LZW-compressed TIFF images, especially large images, encode slower than uncompressed formats.

This article was last updated or verified on 9 October 2012.