Computer memory requirements for raster data

Raster data files can be very large.

If you use raster data extensively, we recommend large amounts of memory (RAM) and plenty of disk space.

If you are using large amounts of raster data and experiencing memory problems, Cadcorp SIS Desktop provides the following possible solutions:

• for geo-referenced data - use indexes. Also, consider using (or converting your data to) a memory-efficient data format such as ER Mapper’s Enhanced Wavelet Compression Wavelet (*.ecw) or LizardTech’s MrSID (*.sid).
• for data which is not not geo-referenced - if you are using bitmaps, JPEG files, RLC files or TIFF format, use the linked option, see Geo-referenced raster files which do not use standard OS naming conventions.

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