The document presents information on open source web GIS. It discusses that open source web GIS is an open source software used for mapping geographical areas that is user friendly. It then provides details on what GIS is, its components including hardware, software, data, methods and people. It describes how data is stored in layers and different data models used. Finally, it discusses implementing web GIS using open source software like GRASS and RDBMS with PHP and the features, advantages, disadvantages and conclusion of open source web GIS.