# HPISLANDDETECTIONMODE [GstarCAD 2020](Help%20System/GSTARCAD/2020/Index.md) → [System Variables](Help%20System/GSTARCAD/2020/System%20Variables/(System%20Variables).md) → [H](Help%20System/GSTARCAD/2020/System%20Variables/H/(H).md) ## Function Description: The HPISLANDDETECTIONMODE system variable is used to control whether to detect internal closed boundary(named island). | | | | --- | --- | | Type | Integer | | Saved in | Not saved | | Initial value | 1 | | Range | 0,1 | ## System Variable Value: **0:**off **1:** on(recommended) --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/H/HPISLANDDETECTIONMODE.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/H/HPISLANDDETECTIONMODE.md) · [GstarCAD 2018](Help%20System/GSTARCAD/2018/System%20Variables/H/HPISLANDDETECTIONMODE.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/System%20Variables/H/HPISLANDDETECTIONMODE.md) · [GstarCAD 2021](Help%20System/GSTARCAD/2021/System%20Variables/H/HPISLANDDETECTIONMODE.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/H/HPISLANDDETECTIONMODE.md)