Glossary
Object
Object Oriented Database
Database with an object oriented model to build the relationships of geographic objects and the attributes using a set of operations and rules. The attributes are classified into objects, classes, super classes etc. that have inheritance relations such as "in a", "part of", "belongs to" etc.
Ortho-image
Image that is transformed into geographic coordinate system or orthogonal coordinate system by correcting the terrain relief distortions resulting from non-orthogonal geometry of the sensor. In case of aerial photograph, it is called orthophoto.
OS
Operating System is software to control the operation of the computer programs as well as all input and output. OS for PCs includes MS-DOS and WINDOWS. OS for workstations includes UNIX.
Overlay
A technique of spatial analysis to superimpose more than two layers to extract useful information.