Lossless compression means that the values of cells in the raster dataset are not changed or lost.
When storing data in the geodatabase, the blocks of data are compressed before they are stored.ĭata compression can be lossy (JPEG and JPEG 2000) or lossless (LZ77, PackBits, CCITT). (Transmission compression for a map cache is the sameĪrcGIS can store compressed data in the following formats: IMG, JPEG, JPEG 2000, TIFF, Esri Grid, or in a geodatabase. Significantly improve performance by reducing band width This is transmission compression and it is Services when transmitting pixels from a server to clientĪpplications. The more highly compressed the raster, the longer it will take to decompress. When using JPEG 2000 compression, the amount of time spent on decompression is often related to the compression ratio. Most wavelet-based decompression is more CPU heavy than JPEG, LZW, or LZ77. However, since compressed data must be decompressed to draw to the screen, it can be slower than data that is not compressed and can increase CPU requirements on the server or application.
An added benefit is greatly improved performance over a network, because you are transferring a reduced amount of the data being read from disk and transferred to the server or direct read application.
The primary benefit of compressing your data is to reduce the size of the file to help save disk space.
