Title picture source http//maps.google.com/ 2 Outline
What are Google Maps anyway
Why use Google Maps anyway
History behind the Google Maps
What difference does it make to us
Trends in the usage of Google Map API
What are Google Map APIs
Basic Concepts of an API
Using Google API
Advantages of using Google Map API.
Using a Google Map on our Web Applications
Google Map MashUps and its use
Some practical examples of Google Map
3 What is Google Maps
Google Maps (for a time named Google Local) is a free web mapping service application and technology provided by Google that powers many map-based services including the Google Maps website Google Ride Finder and embedded maps on third-party websites via the Google Maps API (Application Process Interface). It offers street maps a Route Planner and an urban business locator for numerous countries around the world.
4 Clients (Standard Browsers) Static Images (GIF) GML View (GML) INTERNET WEB CLIENTS HTTP HTTP HTTP WEB SERVER CGI Communication Layer Geospatial Analysis Layer WGIS (Map Server) WMS (OGC) Query Engine Client Side Component Server Side Components GEOSPATIAL DATABASE ACCESS LAYER SPATIAL DATABASE Web GIS Architecture 5 The Google Map page 6 Why use Google Maps anyway
Integrated business search results - Find business locations and contact information all in one location integrated on the map. For example if you search for pizza in San Jose CA locations of relevant listings and phone numbers appear on the map. You can also view additional information like hours of operation types of payment accepted and reviews.
Draggable maps - Click and drag maps to view adjacent sections immediately (no long waits for new areas to download).
Satellite imagery - View a satellite image (or a satellite image with superimposed map data) of your desired location that you can zoom and pan.
Terrain maps - View physical features such as mountains and vegetation with elevation shading.
7 Why use Google Maps anyway contd
Street View - View and navigate within street-level imagery.
Detailed directions - Enter an address and let Google Maps plot the location and driving directions for you. Plan a trip by adding multiple destinations to your route and click and drag the route to customize it. Learn more about Google Maps driving directions.
Double-click to zoom functionality - Double left-click to zoom in and double right-click to zoom out (Ctrl double-click for Mac users).
Scroll wheel zooming - Use the scroll wheel on your mouse to zoom in and out of the maps.
8 Development History behind the Google Map
Google Maps was first announced on the Google Blog on February 8 2005.15 and was located at http//maps.google.com/.
It originally only supported users of Internet Explorer and Mozilla web browsers but support for Opera and Safari was added on February 25 2005. Currently (July 1 2006) Internet Explorer 6.0 Firefox 0.8 Safari 1.2.4 Netscape 7.1 Mozilla 1.4 and Opera 8.02 are supported.16
It was in beta for six months before becoming part of Google Local on October 6 2005.
In early April 2005 an alternate view was activated to show Satellite images of the area displayed.
In late April 2005 Google created Google Ride Finder using Google Maps.
9 Development History behind the Google Mapcontd
In late June 2005 Google released the Extensibility and customisation. In mid July 2005 Google began Google Maps and Google Local services for Japan including road maps.
On July 22 2005 Google released Hybrid View. Together with this change the satellite image data was converted from plate carrée to Mercator projection which makes for a less distorted image in the temperate climes latitudes.
In July 2005 in honor of the thirty-sixth anniversary of the Apollo Moon landing Google Moon was launched.
In September 2005 in the aftermath of Hurricane Katrina Google Maps quickly updated its satellite imagery of New Orleans to allow users to view the extent of the flooding in various parts of that city. (Oddly in March 2007 imagery showing hurricane damage was replaced with images from before the storm this replacement was not made on Google Earth which still uses post-Katrina imagery.
10 What difference does it make to us
The Google Map actually allows to combine one type of information to a specific latitude and longitude and connect that to a display on a map. People today are more interested on location where and using a Google Map we can display the location of just about everything
There are several examples of popular Google Map APIs where people have used the Google Map on their websites and displayed important and relevant information in a elegant way on a Map.
11 What difference does it make to us...contd
Some of the most popular examples
Panoramio.com A website using Google Map API to display pictures of a particular place on a map. The User can upload pictures for a specific place on a map identified with a particular latitude longitude.
12 What difference does it make to us...contd
Wikimapia.org Wiki created by the user community a website where anyone can add their own content and this is a way of communication
13 What difference does it make to us...contd
Trulia This another of the popular websites which has used the Google Maps for presenting their business information in a more elegant way.
14 What difference does it make to us...contd
onNYturf This is a website where a person having some data having some privileges used Google Map to display that data.
15 Trends observed in usage of Google APIs
As we see for the case of onNYturf.com which can be the example of a classic API site where there are some data owned by someone who has access to that data and he presents that data in a map thus the information is useful to millions of users
Then we land on the Wikimapia.com which has an entirely user generated data and where any user can go and see the data added by another user of the world. So it is becoming more and more collaborative trend in the usage of the Google Map API.
16 The different flavors of Google API
API Version Changes (Release Notes)
Current (v2) 2.93
Latest (v2.x) 2.94
Stable (v2.s) 2.73
17 Google Map API
What is the Google Maps API
18 Google Map API concepts
19 Google Map API conceptscontd
When a user searches for a business the results are downloaded in the background for insertion into the side panel and map - the page is not reloaded. Locations are drawn dynamically by positioning a red pin (composed of several partially-transparent PNGs) on top of the map images.
20 Google Map API conceptscontd
The GIS (Geographic Information System) data used in Google Maps are provided by Tele Atlas and NAVTEQ3 while the small patches of high-resolution satellite imagery are largely provided by DigitalGlobe and its QuickBird satellite with some imagery also from government sources. The main global imagery base called NaturalVue was derived from Landsat 7 imagery by MDA Federal (formerly Earth Satellite Corporation). This global image base provides the essential foundation for the entire application.
21 Googles use of Google Maps
The main Google Maps site includes a local search feature finding businesses of a certain category in a geographic area.
Google Ditu Google Ditu was released to the public on February 9 2007 and replaced the old Google Bendi. This is the Chinese localised Google Maps and Google Local services only cover China.
22 Googles use of Google Mapscontd
In honor of the 36th anniversary of the Apollo 11 moon landing on July 20 1969 Google took public domain imagery of the Moon integrated it into the Google Maps interface and created a tool called Google Moon.20 By default this tool with a reduced set of features also displays the points of landing of all Apollo spacecraft to land on the Moon. It also included an easter egg displaying a Swiss cheese design at the highest zoom level which Google has since removed. Google Moon was linked from a special commemorative version of the Google logo displayed at the top of the main Google search page for July 20 2005 (UTC) webarchive.org.
23 Googles use of Google Mapscontd Google Moon 24 Googles use of Google Mapscontd
Google Ride Finder Google launched an experimental Google Maps-based tool called Ride Finder tapping into in-car GPS units for a selection of participating taxi and limousine services. The tool displays the current location of all supported vehicles of the participating services in major US cities including Chicago and San Francisco on a Google Maps street map.
25 Googles use of Google Mapscontd
Google Transit In December 2005 Google launched Google Transit. This is a web application (listed in Google Labs) that plans a trip using public transportation options. Google Transit launched with support for Portland Oregon. Information for Eugene Oregon Honolulu Hawaii Pittsburgh Pennsylvania Seattle Washington and Tampa Florida was added on September 27 200622 with more added since including adding cities in Canada Europe and Japan. The service calculates route transit time and cost and can compare the trip to one using a car.
Google My Maps In April 2007 My Maps was a new feature added to Googles local search maps. My Maps lets users and businesses such as weather.com and Zvents create their own map by positioning markers polylines and polygons onto a map. The interface is a straightforward overlay on the map.
26 Using Google Map API
The steps involved in using Google Maps API
Sign up for a free Google Map API key
Read the Maps API Concepts
Check some of the Maps examples provided.
Refer to the Google Maps API Reference.
You can also have a look at this video of the Google Developer Day 2007 conferencehttp//doug.r icket.com/gdd2007
27 Using Google Map API contd
28 A simple example
After signing up for the Google Map API we just need to have some initial working knowledge about the Google Map API functions and events.
Let us walkthrough a simple code
29 A simple example contd
30 A simple example contd
Lets take the parts of the code one by one
Now lets concentrate on the highlighted codes
31 A simple example contd
Code Explanation Map DOM Elements
32 A simple example contd
map.setCenter(new GLatLng(37.4419 -122.1419) 13)
Code Explanation Initializing the Map
Once weve created a map via the GMap2 constructor we need to do one more thing initialize it. This initialization is accomplished with use of the maps setCenter() method. The setCenter() method requires a GLatLng coordinate and a zoom level and this method must be sent before any other operations are performed on the map including setting any other attributes of the map itself.
33 A simple example contd
Code Explanation Loading the Map
While an HTML page renders the document object model (DOM) is built out and any external images and scripts are received and incorporated into the document object. To ensure that our map is only placed on the page after the page has fully loaded we only execute the function which constructs the GMap2 object once the element of the HTML page receives an onload event. Doing so avoids unpredictable behavior and gives us more control on how and when the map draws.
The end result is a cool map on my page http//voyager.cs.bgsu.edu/cs464/cs464n1/index2.ht ml
35 Some changes to the code before gives us this page See now there is this arrows for moving on the map 36 But everything has pros and cons
Disadvantages of Google Map
Can I use Google Maps in my non-Web application No. The Google Maps API is currently available only for websites.
Does it uses Geocoding
No it uses Latitude and Longitude. But there are competitors in the market like Yahoo!Maps who uses Geocoding Services for its Map API.
But there are more advantages of using a Google Map than disadvantagesLets see what they are
Source http//en.wikipedia.org/wiki/Geocoding 37 How Google Maps help us
Definitely adding a piece of Map only enhances the way of representation of useful data. People love to know Where
and How and what better than a Map!!
More value is added to the information on you web page when you also provide a location people get the value of their money and time they spent to visit your website.
International Map Data Coverage Details - The Google Maps team is constantly pushing new map data out and increasing our international coverage.
38 Some of the cool uses of Google Map
HousingMaps Craigslist apartment listings plotted on Google Maps
Found City A community-generated map of interesting places in New York City
Google Sightseeing A blog that shows the best tourist spots in the world via Google Maps satellite imagery.
Google-Traffic.com Maps traffic data onto Google Maps
Google Maps Wallpapers Merges Google Maps satellite tiles to produce wallpaper or a poster
Cheap Gas Find cheap gas prices powered by gasbuddy and Google Maps
39 Comparable services
Géoportail (A French rival offering detailed aerial (photographic) pictures of French territories)
Seat Pagine Gialle A Italian competitor offering detailed satellite pictures of Italian territories and navigable street level panoramas of Rome (very similar to street view).
Windows Live Local (Microsofts mapping service with road maps and aerial/satellite imagery)
TerraServer-USA (Public domain (older than five years) satellite imagery via Microsoft servers)
Virtual Earth (The original Microsoft map service)
MapFan A MapQuest equivalent for Japan)
40 MashUps Mash it Up!!!
What is a Mash Up anyway
In Software Development a MashUp is a web application that combines data from more than one source into a single integrated tool an example is the use of cartographic data from Google Maps to add location information to real-estate data from Craigslist thereby creating a new and distinct web service that was not originally provided by either source. It just mixes the information from the different APIs across the Internet.
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