data character中文什么意思

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1. By introducing and analyzing the functions , the data requirements , the methods for system development and the data processing of the flood information system for shantou city ( stfis ) , this dissertation provides a basic thinking in building an object - oriented gis database that can be used as a normal mode for a great gis application . it dissertates from many points of view for a gis database such as data characters , data framework , data model and basic methods for database design in detail , with discussing the applications of fundamentals of traditional database systems and advanced database technologies for building a gis database . meanwhile , it discusses the methods for implementing this thinking in the stfis , with analyzing the relationship of the system database and the construction solutions , together with the main functions of the system and the mechanism of data processing for spatial analysis of the stfis
   本文通过对汕头市水灾信息系统的功能、数据需求、系统开发模式、数据处理等方面的介绍和分析，从数据特征、数据结构、数据模型、数据库设计基本方法等角度出发，结合对传统数据库原理及若干新技术应用于地理信息系统数据库构建可行性的探讨，提出了可应用于大型gis应用系统一般模式的面向对象gis数据库的基本构造思想，同时阐述了该构建思想在汕头市水灾信息系统中的实现方法，探讨了汕头市水灾信息系统数据库与系统平台、系统功能之间的关系以及实现系统空间分析功能的数据处理机理。
2. According to the data character in well and the processing power of cpu , a kind of reduction coding technique is proposed to meet the demands of practical well logging . especially , noting that the continuous zero - passing character of sound wave signal , the error - transmitting effect causing by coding is constrained efficiently by using the zero - crossing information
   并根据实际测井的需求，针对井下数据的特点和cpu的处理能力，提出了一种压缩编码方法，特别是根据声波信号不断过零的特点，利用过零信息，有效地抑制了编码所带来的误差传播效应。