网络地理信息组织和提取的研究及其在农业信息中的应用-大地测量学与测量工程专业论文.docx

礴士学位论文摘簧蕊患嚣愁蓬露窒鼗霆攘攥实验。4)运用本文提出的多维地理信息分类及编码，建立了面向网络用 户黪多维农盐嚣惠势类窭壤蕊鼗器疼t零文戳分凑式农盈接惠嚣数援 静理系统为案例，将五层地理信息元数据内容体系及其冗数据镣理系 统模型藏鼷其孛。；，美键谰瓣终邈裂装惠；邈璎德爨分类，’地理霪患缡褥；撼理攘患元数据i时空数据挖掘H博士学位论文 AbstractABSTRACTAs the increasing development of‘‘three S’’teclmologies and network technology,how users can quickly and correctly obtain the needed information，has become one of key issues of geographical information towards public information services，which ma：ke research on internet geographical information organization and extraction been paid more and more attentionIn the light of three information classifications：syntax information， pragnlatics information and semantics information，correspondingly geographical information organization and extraction Can be divided intothree levels，namely，syntax-level，pragmatics—level and semantics-level．However，up to now,geographical information organization and extraction mainly focuses on the syntax—level information organization and extraction， the needs of more advanced level extraction to masses of geographical information of users call not been satisfied．This paper tries to study methods of advanced geographical information organization and extraction， based on research of geognaphical information classification and codes，geographical information metadata and spafio—temporal data mining，facing to users，masses geographical information，full—aspect geographical information expression mad more advanced geographical information organization and extraction under t11e condition of network． Multi．demension geographical information classification and codes， five-level geographical information metadata and hypergraph-based spatio-temporal data mining are put forward．Moreove％user-oriented agricultural geographical information classification and codes，five—level geographical information metadata management system are designed and implemented in the case of distributed Chinese agricultural inff)rmation metadata management sysytem to test methods put forward in t11e