There are a number of sites that offer brief overviews of the basic concepts of GIS in remote sensing and mapping. Other more specialized sites provide information that is useful for self-training. Often a sequence of topics can be pursued at one site. In addition, free software provides an excellent opportunity for "hands on" self-training. The practical problems of implementing GIS, remote sensing and mapping projects soon become evident. A number of commercial firms provide free downloadable software designed for special tasks along with manuals and examples of applications.

Finally, in order to make training more meaningful there are many sources of data that can be downloaded from the Internet and some of the data are free.

Internet training portals are classified under three main categories: (a) Basic concepts, (b) Distance learning and (c) Self-training.