Redraw a ward, a school catchment or a permit area, and every neighbouring area follows the same line. The data stays in GeoJSON.
vectorstream is a web map editor that stores shared borders once, so administrative areas that touch always meet exactly. Public bodies can use it in internal web applications to maintain districts, wards, school catchments, collection rounds and permit areas: when a border is redrawn, the areas on both sides change together. Edits can be undone exactly, imports are checked, and data is exchanged as GeoJSON.
Use cases
Wards, districts and polling areas cover a territory completely. A boundary review moves lines between areas, and each moved line must belong to both areas at once.
School catchments, collection rounds and inspection districts are redrawn as populations and services change. Officers prepare options before a decision is published.
Permit areas, event sites and road works are drawn by staff who work with maps only now and then. Rectangles, circles and snapping cover most shapes, and the GeoJSON export feeds the case management system.
Why topology
A border between two districts is one line. Stored once, it cannot leave a strip of land outside both districts, or inside both, after a boundary review.
Exact undo restores the previous state, including the neighbouring areas. Staff can test a change during a meeting and return to the published boundaries afterwards.
GeoJSON is an open, widely supported format. Importing it with a geometry check and exporting it again keeps vectorstream compatible with existing GIS and records systems.
How it works
Import the published districts or catchments as GeoJSON.
Edit boundaries in a separate document per option. Shared borders keep the areas flush.
Undo restores earlier versions exactly while the options are compared.
Export the agreed boundaries as GeoJSON for the GIS, the website or the records system.
FAQ
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