对空间数据的处理是GIS的核心功能,GIS中的数据通常描述三部分信息 空间信息(位置,空间关系等等),非空间的属性信息,时间信息。数据按照其测 量尺度,可以分为定名、定比、间隔、比率量四种类型。由于各方面的原因,GIS 数据存在着质量问题,了解数据质量有利于数据的正确使用,避免出现“ Garbage in, Garbage Out”的情形。数据质量可以通过元数据进行描述,简单的说,元数据 是对数据的描述,在GIS应用不断发展、空间数据不断增长的情况下,元数据有 助于数据的共享和有效使用

Module 7 Higher -Order Systems (1 hour) TF in Evans or Bode form Approximate a higher order system with a first or second order one Effect of zeros and poles on the transient response Origins of zeros

(P173)In this section the concepts outlined previously will be developed further into some straightforward guidelines for plotting more complex root loci, which will be f llustrated by focusing on a specific example Root locus: (review of previous lecture)

2003年考研数学(一)真题评注 一、填空题(本题共6小题,每小题4分,满分24分.把答案填在题中横线上) (1) lim(cos.x)In(+

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2004年6月全国大学英语四级考试真题和答案 Part I Listening Comprehension(20 minutes) Section a Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked