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In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress. 11.26.1. HTML basic documentation ¶
11.26.3. Text formatting ¶
<b>Bold Textb>
<code>Computer codecode>
<em>Emphasize Textem>
<i> Italic texti>
<kbd>keyboard inputkbd>
<pre>Preformatted Textpre>
<small>Smaller Textsmall>
Important Text
Abbreviation
<address>(contact information)
<bdo>(Text direction)
<blockquote>(a section referenced from another source)
<cite>(Name of job)
<del>(deleted text)
<ins>(inserted text)
<sub>(subscript text)
<sup>(superscript text)
11.26.4. Link (Links) ¶
Regular links：Link Text
image link：
Email link： Send email
bookmark：
Reminder section
Jump to the prompt section
11.26.5. Images ¶
<imgloading="lazy"src="URL"alt="replace text"height="42"width="42">
11.26.6. Style / Block ¶
<style type="text/css">
h1 {color:red;}
p {color:blue;}
style>
<div>Block level elements in documentsdiv>
<span>Inline elements in documentsspan>
11.26.7. Unordered list ¶
<ul><li>projectli><li>projectli>ul>
11.26.8. Ordered list ¶
<ol><li>Item 1li><li>Item 2li>ol>
11.26.9. Definition list ¶
<dl><dt>Item 1dt><dd>Describe the project 1dd><dt>Item 2dt><dd>Describe the project
2dd>dl>
11.26.10. Tables ¶
<tableborder="1"><tr><th>Table Titleth><th>Table Titleth>tr><tr><td>Table Datatd><td>Table Datatd>tr>table>
11.26.11. Iframe ¶
<iframesrc="demo_iframe.htm">iframe>
11.26.12. Forms ¶
<formaction="demo_form.php"method="post/get"><inputtype=
"text"name="email"size="40"maxlength="50"><inputtype="password">
<inputtype="checkbox"checked="checked"><inputtype="radio"checked=
"checked"><inputtype="submit"value="Send"><inputtype="reset">
<inputtype="hidden"><select><option>appleoption><optionselected=
"selected">bananaoption><option>cherryoption>select><textareaname=
"comment"rows="60"cols="20">textarea>form>
11.26.13. Entities ¶
<equivalent to<> equivalent to>© equivalent to ©
Principles, Technologies, and Methods of Geographic Information Systems
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