No other software development system has been designed to work in such a simple and powerful way 沒什么別的軟件開發(fā)系統(tǒng)設計得如此簡單而又功能強大
Based on theory and software of gis , the thesis do some application research on the application of geographic information system to transportation planning , which is pertinent to characteristic of transportation planning and combined with actual circumstance of traffic zone and road network in certain city . during the process of transportation planning and by theoretical base and software development system of gis , basal database is founded , which consists of spatial database and attribute database in information system of transportation planning . the system provides corresponding tools for editing and modifying graph data and can flexibly do some operations such as adding , deleting and modifying and so on 本論文就地理信息系統(tǒng)在交通規(guī)劃中的應用進行了研究,在gis的理論基礎和軟件開發(fā)平臺的基礎上,針對交通規(guī)劃的特點進行了gis的二次開發(fā),結合某城市主城區(qū)交通小區(qū)和道路網(wǎng)絡的實際例子,建立交通規(guī)劃信息系統(tǒng)的基礎數(shù)據(jù)庫,包括空間數(shù)據(jù)庫和屬性數(shù)據(jù)庫,并提供相應工具對圖形數(shù)據(jù)和屬性數(shù)據(jù)進行編輯和修改,可以非常靈活地對它們進行增、刪、改等操作,對交通規(guī)劃的前期預測、交通需求預測、交通分配及規(guī)劃方案的評價進行了探討,最后,對交通規(guī)劃成果進行可視化輸出,如制作各種專題圖,從而將地理信息系統(tǒng)和交通規(guī)劃結合起來,形成交通規(guī)劃信息系統(tǒng),將交通規(guī)劃中具有空間特征的信息進行可視化表達,為信息利用者提供直觀、清晰、全面的信息表達方式,提高了交通規(guī)劃決策的科學性和合理性。
The main contents to be studied and solved are shown as follows : designing scheme of the error compensation system , studying and designing the signal conditioning circuit , designing the data - acquisition circuit , designing and realizing the max1457 software development system . the compensating circuit is designed in virtue of the signal conditioning chip max1457 as its core . the data - acquisition circuit is designed in virtue 硬件方面,根據(jù)總體方案設計了以信號調(diào)理芯片max1457為核心的補償電路;以max1401為核心的數(shù)據(jù)采集電路,用來采集傳感器的電橋電壓和max1457輸出電壓;設計了max1457電源電路, max1457的電源電壓是失調(diào)dac和靈敏度dac的參考電壓,采用了ad586給max1457提供精密5v電源電壓。