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。
By using frames, you can display more than one page in the same browser window.
iframe syntax:
The URL points to a different web page. Properties are displayed in pixels by default, but you can specify that theyare displayed proportionally (for example, “80%”). Set the property value to “0” to remove The properties of the target link must use the Label Description < iframe > Define an inline iframe 11.19.1. Iframe-set height and width ¶
height and width property is used to define iframe height and width of the label.Example ¶
<iframeloading="lazy"src="demo_iframe.htm"width="200"height="200">iframe>
11.19.2. Iframe-remove the border ¶
frameborder property is used to define iframe indicates whether the border is displayed. iframe border: Example ¶
<iframesrc="demo_iframe.htm"frameborder="0">iframe>
11.19.3. Use
iframe to display the target link page ¶ iframe a page that can display a target link iframe , as an example: Example ¶
<iframesrc="demo_iframe.htm"name="iframe_a">iframe><p><ahref="https://www.runoob.com"target="iframe_a"rel="noopener">RUNOOB.COMa>p>
11.19.4. HTML
iframe label ¶