基于dem數(shù)字地形圖可視化軟件設(shè)計(jì)

1、基于 DEM 的數(shù)字地形圖可視化的設(shè)，（哈爾濱工程大學(xué) 自動化學(xué)院，黑龍江 哈爾濱 摘 要:地形結(jié)構(gòu)和特息等基礎(chǔ)數(shù)據(jù)，可以定量描述地貌結(jié)構(gòu)、水文過程、生物分部等空間變化，所以進(jìn)行 DEMGRID模型的數(shù)據(jù)結(jié)構(gòu)；其次，對可視化的基本原理做了簡單的講述；最后運(yùn)用在MFC 開發(fā)環(huán)境下，從底層設(shè)計(jì)出了基于DEM 數(shù)據(jù)可視化的。：高程模型；數(shù)據(jù)結(jié)構(gòu)TheDesignofDEM-basedVisualizationSoftwareforDigital Topographical MapsLI Xin-yu, ZHANG Meng, WANG Wan-jia, MENG Fan-（CollegeofAuto

2、mation,HarbinEngineeringUniversity,Harbin150001,： a digital representation of terrain, DEM has made a series of breakthroughs and progress in data acquisition, storage and management thanks to the development of computer technology and digital terrain ysis techniques. Nowadays, DEM hase a fundamenta

3、l part of National Spatial Data Infrastructure (NSDI) around the globe and has been incorporated into the framework of digital spatial data for large-scale production. There is a large amount of terrain structure and feature data in DEM. Besides, DEM c so give tative descriptions of some spatial var

4、iationssuchas landsc structure, hydrological processes and biological divisionetc. Therefore, it is of：importance to research on the visualization of DEM. In this p r, ly, the data structure of GRID model is yzed. Then the basic principles of visualization are introduced. Finally, in MFC development

5、 environment, the DEM-based visualization software is designed from the ground up.Keywords：DEM;datastructure;數(shù)字高程模型（DigitalElevationModel)DEM。它是用一組有序數(shù)值陣列形式個(gè)分支，其它各種地形特征值均可由此派生。一般認(rèn)為，DTM是描述包程在內(nèi)的各種DEM 是零階單純的單項(xiàng)數(shù)字地貌模型，其他如坡 度、坡向及坡度變化率等地貌特性可在 DEM 的基就一實(shí)現(xiàn)、DEM 的質(zhì)量控制、以及基于基于 DEM 數(shù)據(jù)開發(fā)地形圖顯示。GRID 模型數(shù)據(jù)的一般 GRID 模型數(shù)據(jù)的

6、基本組成如下元數(shù)數(shù)據(jù)(X0Y0格網(wǎng)的間距（如果是長方形的格網(wǎng)，則需要有行間距和列間距11 GRID數(shù)據(jù)可視DEM DEM 數(shù)據(jù)值讀入到程序22 系統(tǒng)整體結(jié)構(gòu)框圖DEM 數(shù)據(jù)加載模塊的設(shè)DEM DEM 數(shù)據(jù)文件，選擇后判斷所選擇圖 3 所示。DEM數(shù)據(jù)模塊的設(shè)3 數(shù)據(jù)加載功能的流程圖個(gè)二維數(shù)組。接著要定義DEM數(shù)據(jù)中包含的信息參數(shù)并將其讀入中。其中，高程值是4數(shù)據(jù)位圖繪制功能的流程圖4 數(shù)據(jù)功能的流程數(shù)據(jù)文件之后進(jìn)行DEM數(shù)據(jù)位圖的繪制。位圖繪制，首先在設(shè)備描述表建立一塊緩沖區(qū)，其次獲取第i行，第j列的指針并建立配色表，對數(shù)據(jù)時(shí)的高程值依據(jù)配色表對不55 數(shù)據(jù)位圖繪制功能的流程圖數(shù)據(jù)圖像顯示功能

7、的流程DEM數(shù)據(jù)位圖繪制好后將被保存在緩沖區(qū)的設(shè)備描述中，圖像的顯示就是將位圖數(shù)將位圖到屏幕區(qū)域，即可得到看到的圖像。DEM 數(shù)據(jù)圖像顯示功能的流程圖如66可視6 數(shù)據(jù)圖像顯示功能的流程圖77 結(jié)本文提出了基于 VC6.0 從底層開發(fā)一個(gè)基于 DEM 數(shù)據(jù)可視化并研究分析了致 參考文WACKERNAGEL M,MONFREDA C,ERB K H,et a1Ecological footprint time series of -tria,thePlulippines,andSouthKoreafor-l999:comparingtheconventionalapproachto anachi

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