通信工程专业毕业设计外文翻译.doc

The potential of XML encoding in geomatics converting raster images to XML and SVG
Byron Antoniou, Lysandros Tsoulos
Abstract
The evolution of open standards and especially those pertaining to the family of XML technologies, have a considerable impact on the way the munity addresses the acquisition, storage, analysis and display of spatial data. The most recent version of the GML specification enables the merging of vector and raster data into a single ‘‘open’’ format. The notion of ‘‘coverage’’ as described in GML can be the equivalent of a raster multi-band dataset. In addition, vector data storage is also described in detail through the GML Schemas and XML itself can store the values of a raster dataset, as values of a multi-table dataset. Under these circumstances an issue that must be addressed is the transformation of raster data into XML format and their subsequent visualization through SVG. The objective of this paper is to give an overview of the steps that can be followed in order to embody open standards and XML technologies in the raster domain. The last part of the work refers to a case study that suggests a step by step methodology to plish classification, an important function in Cartography and Remote Sensing, using the XMLencoded images.
© 2005 Elsevier Ltd. All rights reserved.
Keywords: Open standards; Raster image encoding; Classification

The advent of XML-based technologies has gone beyond the expectations of the most optimistic users. Revolutionary ideas are emerging for the storage, exchange and display of data and new formats are created for almost all kinds of data, applications and knowledge domains. A considerable number of specifications have been issued by anizations
aiming at the provision of an efficient ‘‘open’’ environment to the munity. Watching this frenzy trend of transforming everything into XML-based structures, one thing seems really out of the way: raster images. Languages like HTML and SVG do not h