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Method for cross-document seamless roaming browsing of PDF map

A seamless roaming, document technology, applied in the direction of map/plan/chart, geographic information database, data processing input/output process, etc., to reduce rendering, improve rendering speed, and achieve the effect of document caching

Inactive Publication Date: 2017-05-31
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Such application habits have brought challenges to the promotion of PDF maps

Method used

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  • Method for cross-document seamless roaming browsing of PDF map
  • Method for cross-document seamless roaming browsing of PDF map
  • Method for cross-document seamless roaming browsing of PDF map

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Experimental program
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Embodiment Construction

[0053] The present invention will be described in detail below in combination with specific embodiments.

[0054]Geographic PDF map is becoming an important electronic map document format because of its ease of use and portability. However, common PDF browsers only support viewing of a single map. For traditional electronic maps, seamless roaming and arbitrary zooming are well known to users. How to meet the user's demand for seamless roaming of PDF maps is just the purpose of the present invention.

[0055] Geographic PDF maps comply with standard PDF document specifications, so any PDF reader can open PDF map documents. The implementation of a custom PDF map browser also depends on the relevant PDF rendering engine. Currently, there are many PDF rendering engines available, and some of them have even released their source code. It is not difficult to browse a single PDF map based on a third-party PDF rendering engine. A PDF map is a PDF page. The difficulty lies in the d...

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Abstract

The invention relates to a method for cross-document seamless roaming browsing of a PDF map. A traditional PDF map browser is mainly directed to daily document reading, only one PDF page can be rendered each time and cross-map browsing cannot be achieved. The method comprises the steps of expanding functions of a map set, making the map set record geographic coordinates of various maps at the same time and taking a map document set organized by the map set as a seamless geographic range; during map browsing, directly mapping an electronic map screen to the geographic range represented by the map set and forming a logic window representing the browsing range; completing rendering of the electronic map by taking the logic window as a rendering range; during roaming and zooming, calculating the position of the logic window again and triggering a new round of map rendering. According to the method, cross-map seamless roaming, document cache, fast rendering and automatic adaptation of a multi-scale map set are achieved; and high-quality map product of publishing an original map set is brought while the routine operation habits of a map user are met.

Description

technical field [0001] The invention belongs to the technical field of geographical PDF map browsing, and in particular relates to a method for seamlessly roaming and browsing PDF maps across documents. Background technique [0002] PDF (portable document format) is a document recording format developed and designed by Adobe. PDF documents contain all the data information required for display on the screen and output on printers, phototypesetters, and direct-to-plate machines. They are completely independent of the original application program and computer platform that created it. It has become an ideal document for electronic document transmission and digital information dissemination. Format. In 2004, Layton Graphics of the United States proposed the GeoPDF file format for storing maps and geographic information in PDF documents. Based on the existing PDF standard, this file format has expanded many functions, and creatively stores all geographic information such as map...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/0481G06F3/0484G06F17/30G09B29/00
CPCG06F3/0481G06F3/04847G09B29/003G06F16/29
Inventor 陈勉张静李龙海付少锋
Owner XIDIAN UNIV
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