ECW (file format)

ECW (file format)

Infobox file format
name = Enhanced Compression Wavelet
icon =



caption =
extension = .ecw
mime =
type code =
uniform type =
magic =
owner = Earth Resource Mapping
released =
latest release version =
latest release date =
genre =
container for =
contained by =
extended from =
extended to =
standard =
url =

ECW (Enhanced Compression Wavelet) is an open standardFact|Please indicate where the documentation describing the internal structure of this file format can be obtained.|date=October 2008 wavelet compression image format developed by Earth Resource Mapping. The file format is optimized for aerial and satellite imagery, and efficiently compresses very large images with fine, alternating contrast. This is a lossy compression format.

It has the following properties:

* embeds map projection information
* fast compression (about 1.5 MB of compressed file per second on 1 GHz processor)
* typical compression ratios between 1:10 and 1:100
* possible decompression of selected regions without the need to decompress the whole file
* data flow compression allows for compression of big files with small RAM requirements

Some of the software packages offering support include but are not limited to:

* IrfanView allows one to read and write (even bulk translated) ECW files.

* FalconView has been enhanced by the Australian Defence Force to fully support ECW mapping. (used by US DoD and 23 allied nations)

*ArcGIS® 8.x and 9.x

*ArcGIS® 8.x and 9.x

* ArcPad v6.0

* ArcReader®

* ArcView® 3

* AutoCAD 2000/2000i/2002

* AutoCAD 2004-2006

* AutoCAD 2007 / 2008

* AutoCAD® R14

* ECW Header Editor 2.5

* ERDAS IMAGINE® 8.5, 8.6, 8.7, 9.2, 9.3

* ERDAS ViewFinder® 2.1

* MapImagery Plug-in for MapInfo® 6

* Pitney Bowes MapInfo Professional

* Paint Shop Pro

* Photoshop® 4.0, 7.0

* Trimble ArcPad v6.0 E

Footnotes

External links

* [http://www.gisdevelopment.net/technology/ic/techip0003b.htm gisdevelopment.net - ECW (Wavelet compression for Digital Imagery and Image Web server)]
* [http://www.ifp.uni-stuttgart.de/publications/phowo01/Ueffing.pdf Ueffing - Wavelet based ECW image compression (PDF)]
* [http://www.ermapper.com/ProductView.aspx?t=189 ER Mapper Plugins Download Page]
* [http://www.wavgen.com/ermapper/ECWJPEG2000Compressor_7-0.exe Download Free ER Mapper ECW/JPEG2000 Compressor]
* [http://www.advisory-unit.org.uk/AU_ECW_Compressor/Downloads/AU_ECW_Compressor_Sources_1_0_0.msi Download Free AU ECW Compressor]
* [http://www.irfanview.net/ IrfanView - Image viewer for Microsoft Windows] View/read/write/convert ECW files. Freeware (for non-commercial use).]
* [http://www.xnview.com/ XnView - Image viewer for Windows, Mac OS X, Linux x86, Linux ppc, FreeBSD x86, OpenBSD x86, NetBSD x86, Solaris sparc, Solaris x86, Irix mips, HP-UX, AIX.] Only Windows version View/read/write/convert ECW files. XnView provided as Freeware for private non-commercial, educational use and non-profit organization.]
* [http://www.mapwindow.org MapWindow GIS] Mapwindow web site


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