Preserve Existing Boundary

Video: https://youtu.be/Z4TjWXc4lfk

For redistricting, it is usually required to preserve an existing boundary as much as possible, or minimize the cross of a boundary. iRedistrict can satisfy this requirement.

In the optimization criteria panel, there is a boundary criteria. Enable this criteria and then load the boundary layer. For example, in the image below, we load the MN county boundary.

The green polygon layer is MN county. The unit layer is the MN tract.

Click run and get 10 redistricting plans. The plan boundary is along with the county boundary.

iRedistrict support more than one boundary criteria. Click the + button to add other criteria. The more boundaries to respect, to more compromise to make.