最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
1.8.1. SVG straight line- ¶ Element is used to create a straight line: Here is the SVG code:
Example ¶
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <line x1="0" y1="0" x2="200" y2="200" style="stroke:rgb(255,0,0);stroke-width:2"/> svg> For Opera users: view the SVG file (right-click the SVG drawing preview source).
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The X1 property defines the beginning of the line on the x-axis
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The Y1 property defines the beginning of the line on the y-axis
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The x2 property defines the end of the line on the x-axis.
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The Y2 property defines the end of the line on the y-axis.
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1. Angularjs2
8
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1. SVG tutorial
19
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1.17. SVG gradient-Linear
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1.20. SVG reference manual
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1.14. SVG filter
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1.5. SVG <rect>
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1.18. SVG gradient-radioactivity
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1.2. SVG introduction
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1.10. SVG <polyline>
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1.16. SVG Shadow
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1.19. SVG instance
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1.8. SVG <line>
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1. Introduction to geographic information system
6
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2. From the Real World to the Bit World
3
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3. Spatial Data Model
7
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4. 空间参照系统和 地图投影
5
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3
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6. Spatial data acquisition
2
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7. Spatial Data Management
6
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8. Spatial analysis
8
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9. 数字地形模型（ DTM ）与地形分析
5
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10. 空间建模与 空间决策支持
6
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11. Spatial data representation and map making
6
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12. 3S Integration Technology
5
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13. 网络地理信息系统
3
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14. Examples of Geographic Information System Application
8
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15. Organization and Management of Geographic Information System Application Projects
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19. Earth Information Science and Digital Earth
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Here is the SVG code: For Opera users: view the SVG file (right-click the SVG drawing preview source). The X1 property defines the beginning of the line on the x-axis The Y1 property defines the beginning of the line on the y-axis The x2 property defines the end of the line on the x-axis. The Y2 property defines the end of the line on the y-axis. Example ¶
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <line x1="0" y1="0" x2="200" y2="200" style="stroke:rgb(255,0,0);stroke-width:2"/> svg>