updating the gis by the traditional method is to input the data by hand and needs practical surveying to get the geographical information . this approach consumes too much time and produces little effect, so gis can not be updated in time 在对gis系统的数据更新过程中,如果遥感分类提供的地理信息精度不高,那么用遥感数据来更新gis数据就失去了意义。
secondly, combining practical survey method and time-resistance mathematic model, the author obtained average time distance from every time-cell to fictitious time center, isotime curve figure ( by arc view 3d analyze ) and temporal shape 然后利用实际测量法和理论公式法计算出深圳特区各时间单元的平均时间距离,并用arcview中的3d分析模块自动生成等时线图。
two practical survey data sets are used as a case study to verify the efficiency and reliability of the compensation method . the results show that the precision of the compensated network has been increased from 2.74mgal to 7.11magal . 4 平差结果表明三种平差模型均对测线系统误差进行了有效的补偿,补偿后的精度提高了2.747.11毫伽,而且,对补偿后的测线网进行测线系统误差显著性检验,检验结果显示测线系统误差的影响已不再显著。
this dissertation explicates, based on practical survey, the managing scale, runing way, and economic benefit of qinghai noodle restaurant in shenzhen city, analyzes its potential of further development and existant problems, and put forward some suggestions and countermeasures to it 摘要本文在实地调查的基础上,阐述了在深圳的青海拉面馆的经营规模、经营方式、经济效益,分析了青海拉面馆在深圳进一步发展的潜力和存在的问题,提出了一些建议和对策。
we have discussed in turn the importance of web-based interaction, the definition and category of web-based instruction interaction, the interaction theory of web-based instruction, and put forward in particular four kinds of web-based interaction designs, such as question-enlightened, model-enlightened, experiment-researching and collaboration-discussion with practical surveys 本文依次阐述了网络交互的重要性、网络教学交互的定义和范畴、网络教学交互设计理论,结合实际调查研究提出四种网络教学交互设计:问题引导式、模板引导式、试验探究式和协作讨论式交互设计。