Tools Of The Geospatial Web
Loading...
Flash Player 9 (or above) is needed to view presentations.
We have detected that you do not have it on your computer. To install it, go here.
Favorites, Groups & Events
Tools Of The Geospatial Web - Presentation Transcript
- Tools of the Geospatial Web
- Last week - Google Maps
- It allows users to easily load and internet map through an API
- This kind of map is classified as a Open, Reusable map
- This Week
- Look at the API concept
- Look at AJAX in greater detail
- Look at other non-API Web Mapping Applications
- What is API
- An API is an Application Programming Interface
- It web-developers to leverage the power of other applications through their own websites
- Google Maps API
- This API allows us to leverage the methods and classes developed by Google for this application
- What does this look like?
- <title>Google Maps JavaScript API Example</title>
- <script src="http://maps.google.com/maps?file=api&v=2&key=abcdefg"
- type="text/javascript"></script>
- <script type="text/javascript">
- function initialize() {
- if (GBrowserIsCompatible()) {
- var map = new GMap2(document.getElementById("map_canvas"));
- map.setCenter(new GLatLng(37.4419, -122.1419), 13);
- Event handler and its place
- <body onload="initialize()" onunload="GUnload()">
- <div id="map_canvas" style="width: 500px; height: 300px"></div>
- </body>
- More Information
- http://www.google.com/apis/maps/documentation/introduction.html
- Other APIs
- Yahoo! Maps
- http://developer.yahoo.com/maps/
- Virtual Earth SDK
- http://dev.live.com/virtualearth/sdk/
- ArcWeb Services
- http://www.esri.com/software/arcwebservices/index.html
- AJAX
- Ajax - Asynchronous JavaScript and XML
- Ajax allows the Web browsers to send GET and POST requests without refreshing the browser
- POST and GET
- Are Methods that are stated in submission forms
- Eg. Database search
- http://first6years.org/?q=node/14
- GET VS POST
- Get is used primarily in querying data
- Post is used for posting or uploading data into a database
- What does AJAX do?
- In AJAX POST and GET are managed through the AJAX engine or javascript object
- This is done asynchronously meaning that code execution doesn’t wait for a response from a server
- What does the user see?
- This creates a seamless experience allowing for richer experiences similar to the desktop environment.
- Non-API Internet GIS Applications
- Other Internet GIS applications allow for more robust tools and customization of both Primary and secondary data.
- Most now come with Out-of-the-Box development tools
- Open SourceApplications
- Mapserver - OGC Compliant first designed by NASA
- http://mapserver.gis.umn.edu/
- Geoserver- OGC Compliant with an interface similar to Open Layers
- http://geoserver.org/
- Application Architecture
- These Web Mapping Systems run a webserver or integrate with one
- Store Spatial data in a directory and provide an interface for creating your mapping application
- Map files
- Data is then stored in an XML based Map file which is used to define the look and feel of the web map
- Generally these files are used on one map at a time
- Break
- After the break we will look at these two different applications in greater detail
More info about this document
© All Rights Reserved
Go to text version
- Total Views 519
- 519 on SlideShare
- Comments 0
- Favorites 0
- Downloads 37
Most viewed embeds
All embeds
- Upload Info
- Also on LinkedIn
- Uploaded via SlideShare
- Uploaded as Microsoft PowerPoint
0 comments
Post a comment