Basic concepts
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A bounding box-processing operator checks whether two objects meet a specified spatio-temporal relationship. The left and right operands define the two objects being compared.
Operator marks
Three operator marks are supported:
| Operator mark | Question answered | Spatial relationship |
|---|---|---|
&& or & | Do the bounding boxes overlap? | INTERSECT |
@> | Does the left bounding box contain the right? | INCLUDE |
<@ | Is the left bounding box contained by the right? | INCLUDED |
The dimensions compared depend on whether dimension marks are present. See Dimension marks.
Dimension marks
Two dimension marks are supported:
| Dimension mark | Dimension |
|---|---|
/ | z |
# | t |
The position of a dimension mark relative to the operator mark determines which dimensions are compared:
| Mark position | Dimensions compared | Example |
|---|---|---|
| Between the operator marks | x, y, and the marked dimension | &/& compares x, y, and z |
| On both sides of the operator mark | The marked dimension only (not x or y) | /&&/ compares z only |
| Absent | x and y only (two-dimensional) | && compares x and y |
When an operator contains both dimension marks, the z mark (/) precedes the t mark (#).
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