Technology Of The Geospatial Web Nov3
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TECHNOLOGY OF THE GEOSPATIAL WEB
ENVS 4522
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2 Kinds of Web Maps
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Static Web Maps
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Data is pre-loaded
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<A HREF="rollover_target.html"onMouseOver = "rollover('home')" onMouseOut = "rollout('home')" ><IMG SRC="../graphics/home_out.gif" NAME="home" ALT="Home Page" BORDER=0 HEIGHT=130 WIDTH=115></A><SCRIPT TYPE="text/javascript"><!--setrollover("../graphics/home_over.gif");//--></SCRIPT>
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<?xml version="1.0"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="467" height="462"><!-- This is the red square: --><rect x="80" y="60" width="250" height="250" rx="20" fill="red"stroke="black" stroke-width="2px" /><!-- This is the blue square: --><rect x="140" y="120" width="250" height="250" rx="40" fill="blue"stroke="black" stroke-width="2px" fill-opacity="0.7" /></svg>
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Stored in public directory
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Dynamically Created Web Maps
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General Software
• Webserver
• Geodatabase• Spatial data
• Map server
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Dynamically Created Web Maps
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Geoserver
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<gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>0,0 100,0 100,100 0,100 0,0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon><gml:Point><gml:coordinates>100,200</gml:coordinates></gml:Point><gml:LineString><gml:coordinates>100,200 150,300</gml:coordinates></gml:LineString>
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Mapserver
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ArcIMS
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Other types of web maps
• Distributed web mapsMaps are created from distributed data sources. The interface of the web mapping system provides a method to access maps on other servers.o http://www.openlayers.org/
• Real time web mapso Real time maps show the situation of a phenomena
as it is occurring.http://science.nasa.gov/Realtime/jtrack/3d/JTrack3D.html
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• Open, reusable web mapso Web maps in this category are usually more complex
web mapping systems that offer APIs for reuse in other people's web pages and products. An example for such a system with an API for reuse is Google Maps. http://developer.yahoo.com/maps/flash/index.html
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Evolution: Transferring of Data
• The difference lies in how data is streamed from the provider to the user Over the Internet
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Data Components of Web Maps
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Vector
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Raster
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Vector VS Raster
• Neither is better
• The data you utilize depends on the purpose of the application
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Vector VS Raster
• Vector data is an interpretation of the natural world
• Raster data is an actual representation of the natural world at a moment in time
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Primary VS Secondary Data
• Primary Datao Data that the application is concerned abouto Main theme of the application
• Photoso http://www.iceburnslair.com/mapper/lv-
night/GMap.php
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Primary VS Secondary Data
• Basemap Datao Supporting spatial data used to contextualize the
mapping application's theme.
o Basemap http://www.openstreetmap.org
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Summary
• Web maps requireo Spatial Datao Software package to serve up the spatial datao A general plan as to the purpose of the
application