| With the development of information technology and the promotion and application of the Tablet PC, digital tablet PC has significant application prospect in acquiring field information collection office statistics of the second type inventory of forest resources. The existing forest resources data collection mobile platform is now mainly running on a PDA, due to its small screen, and the weak capacity constraints, it cannot fully substitute the traditional paper based method. The popularity of Tablet PC hardware makes the traditional functions that implemented on desktop and notebook computers can be moved onto mobile platforms, so as to realizing fully paperless in field information collection, and automatic data updating.In view of the advantages and disadvantages of the mobile GIS running on a PDA, and the features of Windows8Tablet PC, this thesis design and develop a mobile GIS platform of full independent intellectual property rights. Based on the Mobile GIS platform, combining the processes and standards for investigation of the second type inventory of forest resources, we develop a software system suitable for field operations of the forestry staff. Aiming to minimize the burden of field investigators, reduce the labor intensity of the field investigation work and improve the accuracy of data collection, making the complex and tedious Forest Resources Survey work intelligent, automatic and interesting, the key findings are as follows:1. Development of the V1.0for Forest Resources Information Acquisition System software. The design use Windows8tablet-specific operating system as the operating system platform, and Microsoft’s latest release of Visual Studio as the software development platform, Visual C#as the development language, and SQLite as the embedded development database. The following have been achieved:automatically read the mainstream GIS vector data, automatically match the common used coordinate systems, the high ratio compression of the remote sensing image, and read and display in block, drawing and editing the second type inventory of forest resources in small groups, rapid input and modification of attribute data features of the second type inventory of forest resources.2. Combining field information gathering with indoor statistical software.The system enables completely paperless field investigation, topographic maps and remote sensing images are loaded on the Tablet PC for viewing. The data collected is exported through the USB interface by a click of one button, realizing seamless connection with indoor software and database.3. High ratio data compression algorithm. The data, especially the remote sensing data is large in size; it is difficult to achieve fast browsing on mobile devices. In processing the high-resolution, system memory consuming remote sensing image data with ECW compression algorithm technology, we achieved a high ratio compression of the remote sensing image data, and enhanced the functionality of the Tablet PC in processing remote sensing image data. Reduce the image volume while meeting the requirements of undistorted screen display on Tablet PC.4. Software testing. The developed software can run on different brands and different models of Windows8Tablet PC, and identify the hardware platform with a GPS module or an external one. The software has passed the positioning speed and accuracy test. The positioning time is10s in the open areas and15s in mountain areas. In respect of the positioning accuracy, the positioning standard differential in the horizontal direction is the1.83m, and1.59m in the vertical direction, the positioning error is2.42m, it is a satisfactory result.This article is supported by "the Forestry Information Intelligent Acquisition PDA Technology Industrialization Research (11CY019)" project of Hunan Provincial Scientific and Technological Achievements Industrialization Project... |
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