Properties
Map projection information can be embedded into the ECW file format to support geospatial applications.
Image data of up to 65,535 bands (layers or colors) can be compressed into the ECW v2 file format at a rate of over 25 MB per second on an i7 740QM (4-cores) 1.731 GHz processor using v4.2 of the ECW/JP2 SDK. Data flow compression allows for compression of large images with small RAM requirements. The file format can achieve typical compression ratios from 1:2 to 1:100.
The ECW Protocol (ECWP) is an efficient streaming protocol used to transmit ECW and JPEG2000 images over networks, such as the Internet. ECWP supports ECWPS for private and secure encrypted streaming of image data over public networks such as the Internet.
There is a very fast read-only SDK supporting ECW and JPEG2000 which is available for no charge for desktop implementation (Microsoft Windows only). The read / write SDK is available for desktop and server implementations, but are not free. A full functioning server implementation (using ECW, JPEG2000, ECWP and JPIP) is available with an ERDAS APOLLO IWS license. A previous version of the SDK (3.3) is available in open source, and can be used for non-Microsoft operating systems, such as Linux, MacOs or Android.
Read more about this topic: ECW (file Format)
Famous quotes containing the word properties:
“A drop of water has the properties of the sea, but cannot exhibit a storm. There is beauty of a concert, as well as of a flute; strength of a host, as well as of a hero.”
—Ralph Waldo Emerson (1803–1882)
“The reason why men enter into society, is the preservation of their property; and the end why they choose and authorize a legislative, is, that there may be laws made, and rules set, as guards and fences to the properties of all the members of the society: to limit the power, and moderate the dominion, of every part and member of the society.”
—John Locke (1632–1704)