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However, it is important to note that a native format web archive, i.e., a fully browsable web archive, with working links, media, etc., is only really possible using crawler technology. The Web is so large that crawling a significant portion of it takes a large number of technical resources. Also, the Web is changing so fast that portions of a ...
Two common techniques for archiving websites are using a web crawler or soliciting user submissions: Using a web crawler : By using a web crawler (e.g., the Internet Archive ) the service will not depend on an active community for its content, and thereby can build a larger database faster.
The NASA Images archive was created through a Space Act Agreement between the Internet Archive and NASA to bring public access to NASA's image, video, and audio collections in a single, searchable resource. The Internet Archive NASA Images team worked closely with all of the NASA centers to keep adding to the ever-growing collection. [128]
Search engine indexing is the collecting, parsing, and storing of data to facilitate fast and accurate information retrieval.Index design incorporates interdisciplinary concepts from linguistics, cognitive psychology, mathematics, informatics, and computer science.
ht://Dig includes a Web crawler in its indexing engine. HTTrack uses a Web crawler to create a mirror of a web site for off-line viewing. It is written in C and released under the GPL. Norconex Web Crawler is a highly extensible Web Crawler written in Java and released under an Apache License.
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An archival image is an image meant to have lasting utility. Archival images are usually kept off-line on a cheaper storage medium such as CD-ROM or magnetic tape , in a secure environment. Archival images are usually of a higher resolution and quality than the digital image delivered to the user on-screen.