After
 read article about development GIS on wikipedia, I've tried to use some
 open layer site called SAAS like Google Maps, OpenStreetMap, Virtual 
Earth, Yahoo! Maps, and World Wind servers. SaaS (Software as a Service)
 sometimes referred to as "on-demand software", is a software delivery 
model in which software and associated data are centrally hosted on the 
cloud. SaaS is typically accessed by users using a thin client via a web
 browser.
And
 I've just tried Google Maps and Yahoo! Maps and found some differences 
among both. In this case I choosed my hometown Singosari, Malang City to
 compare. This is the result for sightseeing.
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| Yahoo! Maps Image and Google Maps Image | 

