# Offset values

An offset value is a number that is subtracted from all coordinates, leaving only positive values as a remainder.

Db2® Spatial Extender converts your coordinate data using the following formulas to ensure that all adjusted coordinate values are greater than 0.

**Formula notation:**In these formulas, the notation

minrepresents

the minimum of all. For example,

min(x)means

the minimum of all x coordinates. The offset for each geographic direction is represented as dimensionOffset. For example, xOffset is the offset value applied to all X coordinates.

```
min(x) - xOffset ≥ 0
min(y) - yOffset ≥ 0
min(z) - zOffset ≥ 0
min(m) - mOffset ≥ 0
```