O

oblique

Angle at which Pictometry images are taken that shows elevation. Oblique images can only be viewed one at a time and are taken from four directions: north, south, east, west.

orthogonal

Aerial two-dimensional view from above where Pictometry images are taken. Since orthogonal images display directly above a feature and there is no depth, the elevation of that feature is hidden and the scale constant.

overlay

A layer placed on an underlying layer or base map where symbols and annotations are displayed. Often the overlying layer is set to be transparent to some degree to allow the layer or base map details to be visible also.

overview map

A map frame that shows the currently displayed map boundaries as a reference within the full map to inform you of where the currently displaying map is in relation to the full map.