tailieunhanh - Dynamic and Mobile GIS: Investigating Changes in Space and Time - Chapter 9

Chương này xây dựng dựa trên màn hình và xem các chủ đề của cuốn sách này và từ Tập trung vào việc tự động tạo bản đồ sơ đồ theo yêu cầu cho các thiết bị di động sử dụng một kỹ thuật smallscreen ủ mô phỏng. Ứng dụng GIS di động trôi Lợi ích của việc khái quát thông tin bản đồ bằng cách dựng hình giảm ở quy mô dễ đọc bằng cách lọc Với thông tin cần thiết cũng như Tăng cường trực quan của các dữ liệu quy mô lớn trên thiết bị hiển thị. | Chapter 9 Generalisation of Large-Scale Digital Geographic Datasets for MobileGIS Applications Suchith Anand1 J. Mark Ware2 and George Taylor2 1 Centre for Geospatial Science University of Nottingham England 2 Faculty of Advanced Technology University of Glamorgan Wales Introduction This chapter builds upon the display and visualisation theme of this part of the book and focuses on the automatic production of schematic maps on demand for smallscreen mobile devices using a simulated annealing technique. Mobile GIS applications derive benefits of map generalisation by rendering relevant information legible at a given scale by filtering the required information as well as enhancing the visualisation of the large-scale data on small-screen display devices. With the advent of high-end miniature technology as well as digital geographic data products like OSMasterMap and OSCAR it is desirable to devise proper methodologies for map generalisation specifically tailored for MobileGIS applications. Schematic maps are diagrammatic representations based on linear abstractions of networks. Transportation networks are the key candidates for applying schematisation to help ease the interpretation of information by the process of cartographic abstraction Avelar 2002 . Generating schematic maps is an effective means of generalisation of large-scale digital datasets for display on small-screen display screens and is primarily aimed at enhancing visualisation and also making such maps user friendly for interpretation. Hence the relevance of schematic maps in mobile applications and their automated production underpins the theme of this part of the book. The remainder of this chapter is set out as follows. Section provides some background information on Mobile GIS. Section looks into map generalisation requirements from a MobileGIS perspective. Section introduces schematic maps and gives a short review of previous automated solutions to the problem of schematic map .