{"title":"面向地理信息系统的可视化信息流查询语言","authors":"E. Jungert","doi":"10.1006/jvlc.1993.1022","DOIUrl":null,"url":null,"abstract":"The query language Graquala, described and discussed here, is designed for a geographical information system. The basic map data structure to which Graquala has been adapted is a homogeneous raster-based structure of run-length-code (RLC) type. Because of the homogeneity of the map data structure, queries can be applied in a more or less generic way; that is, queries can be applied to all map data regardless of their type. For this reason it has been possible to design a visual data-flow query language that allows compound queries which can become quite complex. In this work, Graqula and some elements of its environment, including a brief overview of the basic map data structure, will be discussed.","PeriodicalId":275847,"journal":{"name":"J. Vis. Lang. Comput.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":"{\"title\":\"Graqula-A Visual Information-flow Query Language for a Geographical Information System\",\"authors\":\"E. Jungert\",\"doi\":\"10.1006/jvlc.1993.1022\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The query language Graquala, described and discussed here, is designed for a geographical information system. The basic map data structure to which Graquala has been adapted is a homogeneous raster-based structure of run-length-code (RLC) type. Because of the homogeneity of the map data structure, queries can be applied in a more or less generic way; that is, queries can be applied to all map data regardless of their type. For this reason it has been possible to design a visual data-flow query language that allows compound queries which can become quite complex. In this work, Graqula and some elements of its environment, including a brief overview of the basic map data structure, will be discussed.\",\"PeriodicalId\":275847,\"journal\":{\"name\":\"J. Vis. Lang. Comput.\",\"volume\":\"5 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1993-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"8\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"J. Vis. Lang. Comput.\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1006/jvlc.1993.1022\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"J. Vis. Lang. Comput.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1006/jvlc.1993.1022","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Graqula-A Visual Information-flow Query Language for a Geographical Information System
The query language Graquala, described and discussed here, is designed for a geographical information system. The basic map data structure to which Graquala has been adapted is a homogeneous raster-based structure of run-length-code (RLC) type. Because of the homogeneity of the map data structure, queries can be applied in a more or less generic way; that is, queries can be applied to all map data regardless of their type. For this reason it has been possible to design a visual data-flow query language that allows compound queries which can become quite complex. In this work, Graqula and some elements of its environment, including a brief overview of the basic map data structure, will be discussed.
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