A geographic information system (GIS) is always amuse me. I like to explore this approach, expecially in integration with the hydrological and water resource researches. GIS can be defined as a system designed to capture, store, manipulate, analyze, manage, and present all types of spatial or geographical data.
Below some links regarding the GIS that I mark, to be my reference in the future:
Open Source GIS software
Source of GIS data (Raster, Image, etc)
- USGS Earthexplorer http://earthexplorer.usgs.gov/
- Malaysia spatial GIS data http://mygdix.mygeoportal.gov.my/