Augmented Reality (AR) is a growing research area in virtual reality and generates a composite view for the user. It is
combination of the real scene viewed by the user and a virtual scene generated by the computer that augments the scene
with additional information. About 80 percent information in the real world is related with spatial location. The
combination of Geographical information system (GIS) and AR technologies would promote the development of outdoor
AR systems, and also would explore a new research direction for GIS. The key technologies of outdoor augmented
reality GIS, including basic tracking methods, display devices, typical applications and registration processes, are
discussed. In indoor augmented reality's closed environments the tracking of position and head orientation as well as the
presentation of information is much more unproblematic than the same task in an outdoor environment. The main
application task of outdoor augmented reality GIS is the presentation of information to a user while moving through an
unknown region. The system helps to detect automatically objects in sight of a person who need its information. It
compares the conventional solutions of 3D registration with, while it discusses their algorithm procedure to basic
parameters to give out their advantages and disadvantages at different condition. While affine transformation approach
uses the idea of computer graphics and vision technology for reference. Its accuracy is mainly based on the precision and
speed of scene feature point extracted from natural or artificial feature.
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