Correct a boundary once and both neighbouring parcels follow. Split, merge and trim parcels in the browser, then hand clean GeoJSON back to your registry system.
vectorstream is a browser-based geometry editor for web maps that stores the border between two parcels as one shared edge. In cadastre and land registry tools, a surveyor or registry clerk can move, split or merge parcels, and the neighbouring parcels change in the same edit, so no gap or overlap appears along the boundary. Every change can be undone exactly, and parcels go in and out as GeoJSON.
Use cases
A resurvey shows that a boundary corner sits in the wrong place. Drag that one vertex and both parcels that meet there change together. The register never holds one corrected parcel next to a neighbour that was left behind.
An owner splits one lot into three building plots, or two adjoining lots are merged under one title. Both are edits to an existing parcel fabric, and the new lines must meet the old ones exactly.
When a road is widened, a strip along the frontage of each affected parcel passes to the public authority. Cut that strip off the parcel edge and the remaining parcel keeps its shared borders with the neighbours.
Why topology
In a drawing-only editor, two neighbouring parcels each keep their own copy of the line between them. Edit one and the other stays put, leaving a sliver. vectorstream stores the line once, so there is nothing to keep in sync.
Registry edits need a clean way back. Undo in vectorstream restores the previous geometry exactly, including every neighbouring parcel that the edit touched.
Parcel data often arrives as exports from older systems. The GeoJSON import checks geometry before it reaches the map, and the export gives your registry backend plain GeoJSON again.
How it works
Import the affected parcels as GeoJSON. The geometry check reports broken shapes before editing starts.
Move a corner, split a lot or cut off the road strip. Snapping keeps new corners on existing ones.
Walk back through the edits. Each undo returns the parcels to exactly the shape they had.
Read the changed parcels back as GeoJSON and pass them to the system that keeps the legal record.
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