摘要：From http://www.performancetesting.co.za/Baseline%20Testing.htmIntroductionBaseline tests form a very important part of the performance test methodology I follow. If done properly, 85% of performance problems can be identified and solved when proper baseline tests are done. Recent experiences on thr 阅读全文

摘要：From http://maps.unomaha.edu:16080/Peterson/gis/notes/MapProjCoord.htmlOutlineMap ProjectionsBasic PrinciplesEarth’s Shape and Vertical DatumsGeographic Coordinate System (latitude and longitude)Map Projections DefinedTypes of Projections.AzimuthalCylindricalConicMathematicalProjection distance, are 阅读全文

摘要：From http://en.wikipedia.org/wiki/Croncron is the time-based job scheduler in Unix-like computer operating systems. cron enables users to schedule jobs (commands or shell scripts) to run periodically at certain times or dates. It is commonly used to automate system maintenance or administration, tho 阅读全文

摘要：From http://www.directionsmag.com/articles/fun-with-georss/123114Summary:If you know what RSS is, GeoRSS is a logical step forward. But, since many people only vaguely know of RSS, let’s start there. RSS stands for Really Simple Syndication or Resource Description Framework (RDF) Site Summary or Ric 阅读全文

摘要：GML-GeoRSS GML From http://georss.org/gmlGeography Markup Language (gml) is an XML grammar written in XML Schema for the modelling, transport, and storage of geographic information...GML provides a variety of kinds of objects for describing geography including features, coordinate reference systems, 阅读全文

摘要：From http://blog.gisforum.net/u/60302/archives/2008/2420.htmlKML、GML、GeoRSS、SVGhttp:///liongg.net零零散散这些概念接触好多年，你说我说这些概念潮起又潮落。从宏观上看，对地理信息(geographic information)或地理数据(Geodata)的操作无外乎获取、处理、存储、传输、显示等。KML、GML、GeoRSS、SVG不过是多种Geodata Format（地理数据文件格式），从本质上看和shapefile之流无异，只不过更适于GeoWeb时代一展风骚罢了。每一种格式都需要一种或一些软件 阅读全文

摘要：KML-Keyhole Markup Language From https://developers.google.com/kml/documentation/kml_tut?hl=zh-CNKML 是一种文件格式，用于在地球浏览器（例如 Google 地球、Google 地图和谷歌手机地图）中显示地理数据。KML 使用含有嵌套的元素和属性的基于标记的结构，并符合 XML 标准。所有标记都区分大小写，而且完全如 KML 参考中列出的那样显示。该参考指出了哪些标记是可选的。在指定元素内，标记必须按照参考中显示的顺序显示。如果您尚不熟悉 KML，请查看本文档和附带的示例文件（SamplesInE 阅读全文

摘要：From http://gamblis.com/2009/10/03/open-esri-shape-files-in-quantum-gis/admin | October 3, 2009 | no comments Easy AdSense by UnrealThis basic tutorial of Quantum GIS will show how to open or load shape files (.shp) into Quantum GIS. As we know, the free and open source Quantum GIS can handle ESRI s 阅读全文