compression
[computing] The process of reducing the size of a file or database. Compression improves data handling, storage, and database performance. Examples of compression methods include quadtrees, run-length encoding, and wavelets.
[edit] Compression ratio
The compression ratio (that is, the size of the compressed file compared to that of the uncompressed file) of lossy video codecs is nearly always far superior to that of the audio and still-image equivalents.
compression -- Fossil formed when an organism is flattened (compressed) and a thin film of organic material from its body is left in the rock.
compression Squeezing a material from opposite directions.
concordant Lying parallel to, rather than cutting across surrounding strata.
Compression
A series of techniques used for the reduction of space, bandwidth, cost, transmission, generating time, and the storage of data.
compression. a computer process using algorithms that reduces the size of electronic documents so they occupy less digital storage space ...
Lossy compression- The compression of the image data decreases the geometric and radiometric quality information.
MNO ...
Compression techniques for working with large datasets
One place labels and automated placement and adjustment
Masking out features based on display properties ...
Compression techniques can be either {\em lossless} or {\em lossy}. A lossless compression scheme is one which guarantees perfect reconstruction of all of the bits in the original dataset.
Compression - A variety of techniques used to reduce the physical size of data files.
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During compression, this program reformats raster files using a run-length-encoding (RLE) algorithm. Raster map layers which contain very little information (such as boundary, geology, soils and land use maps) can be greatly reduced in size.
A file compression utility usually found on PC systems.
PNG
Portable Network Graphics.
Enhanced Compression Wavelet file support for improving performance when combining geotechnical data with raster images
Enhanced data export filters and tools, including data filters, zone filters, and the ability to select points from site layout ...
Because some compression programs, such as WinZip, include extension ARC as a compressed file in the Explorer display window, it does not mean the file is compressed. The file is still an R2V Arc file in the format described here.
* Higher 1-dB compression point. Consider designing for a higher 1 -dB compression point, particularly if you must use a wider bandwidth front end, ...
The reduction in precipitation is the result of compression warming of descending air. Rainsplash Soil erosion caused from the impact of raindrops. Rainwash The erosion of soil by overland flow.
ArcInfo is fully compliant with CCITT Group IV, the Standard for raster data compression.
They move through the Earth in compression and expansion motions (much like sound waves move through air). Called primary because they are the first recorded at a seismograph. Primary waves are able to travel through both solids and liquids.
Macromedia Flash MX (ver 6) (15 March 2002) - Released with Flash Player 6, new features included: a video codec (Sorenson Spark), Unicode, v1 UI Components, compression, ActionScript vector drawing API ...
JPEG uses a sophisticated mathematical technique of graphic compression. The designer can choose the level of compression applied to a graphic; huge compression ratios are possible.
This is done in order to save a little image space, although the savings should be minimal if JPEG or similar compression is used. After overlaying the image you may wish to view it with North pointing more conventionally.
'Sound' is defined as mechanical compression or longitudinal displacement waves that propagate through a medium (solid, liquid or gas).
5 Megs to just over 5 Megabytes using JPEG compression. You can view the DOQs in Netscape after downloading by renaming the extension to jpg.
Programs available below are for the old DOQ header format ...
run-length encodingA data compression technique for storing raster or gridded data. Run-length encoding stores data by row.
Alter the Format to disable compression for Vector and Image data (to give the best quality) and to Embed All Document Fonts.
JPEG: Joint Photographic Experts Group. A standardized image compression mechanism which can obtain high compression ratios, but may cause some data loss. Pixel values will be slightly different after decompression.
K ...
Although this is a reduced compression of the only analytical GIS tools related to the many thousand operations of a full fledged GIS, nevertheless, in my opinion, ...
Vectorization preview
Vectorization settings (compression tolerance)
Raster cleanup
View a demo of ArcScan for ArcGIS [WMV].
JPEG is a common picture format. It uses a variable-resolution compression system offering both partial and full resolution recovery.
DEM ...
Both the single and inline techniques have been used for "on-the-fly" data compression"simply keep the summary statistics and discard the pile of raw measurements (not recommended).
Considering a sphere of approximately 6 m in diameter then the ellipsoid is derived by compressing the sphere at each pole by 1 cm only. This compression is rather small compared to the dimension of the semi-major axis a.
The WebLink control method BMP2GIF generates a GIF file given a source BMP file and similarly, the method BMP2JPEG generates a JFIF format JPEG file. Both of these formats greatly reduce the size of the image data through compression and thus reduce ...
LZW Lempel-Zif-Welch: a popular data compression technique developed in 1977 by J. Ziv and A Lempel. Unisys researcher Terry Welch later created an enhanced version of these methods, and Unisys holds a patent on the algorithm.
compression p. 67 a software procedure that encodes a data structure so that its storage occupies less space (under certain conditions); may preserve all the information (loss-less) or deliberately simplify. connected coverage frameworks p.
 See also: Information, Image, Feature, Location, Software
  
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