# Glossary

## background map

A background map is a backdrop, a key map that allows the user to locate a spatial location in a geographical environment.

## coordinate system

A two-dimensional, planar coordinate system in which x measures horizontal distance and y measures vertical distance. Each point on the plane is defined by an x,y coordinate.

## geometry

Any Spatial Object will have an associated footprint displayed in the Geospatial tab. In the present version, only polygons are supported.

### geospatial query

Finds all spatial objects (for example, documents) that intersect with a search area (most likely a minimum bounding rectangle (MBR) defined by the user). A fast search would check the search area against the MBR of all documents. A more extensive search would then reduce the result set further by checking the geometries of the documents within the search area.

## minimum bounding rectangle (MBR)

Represents the smallest rectangle completely enclosing a spatial location.

## spatial location

A row in the spatial_locations table that stores two geometry representations and a spatial index for business objects in the ProjectWise database. The original geometry is stored in the local coordinate system for the file. A master geometry will also be defined relative to a master coordinate system, which is a common coordinate system among a group of spatial locations. Accepted geometry types are point, line, polygon, and extruded rectangle. A spatial location is a geometry and its projection.

## universal coordinate system (UCS)

A self describing coordinate system used to relate geometries from other coordinate systems to a common framework for spatial queries. Multiple Master SRCs may be defined within a ProjectWise data source. In the Geospatial world, there is only one UCS and it is defined for the entire datasource.