Draft land-use areas, zoning districts and development blocks that meet exactly. Work on variants side by side and export the chosen plan as GeoJSON.
vectorstream is a geometry editor for web maps that keeps planning areas topologically connected: the border between two zones is stored once. Planners can redraw a district line, split a block or merge two land-use areas, and every adjacent area follows the change. Draft plans are saved automatically in the browser as separate documents and export as GeoJSON.
Use cases
A land-use plan is a set of areas that together cover a district: housing, mixed use, green space, transport. When a district line moves, the areas on both sides must move with it.
In a masterplan, streets frame the blocks and blocks are divided into plots. Rectangles, corner snapping and the straightening tool give plots clean corners without typing coordinates.
Planning means comparing options. Keep each option as its own document, saved automatically in the browser, and export only the one that goes out for consultation.
Why topology
A district line belongs to both districts. Stored once, it cannot drift into a gap or an overlap when one side is redrawn, so the plan stays consistent from one draft to the next.
Planners try things. Each variant lives in its own document in the browser and every edit can be undone exactly, so an experiment never damages the draft that was agreed.
Planning portals are built on Leaflet, OpenLayers or MapLibre GL. vectorstream runs one editing core behind all three adapters, so the editing behaviour stays the same if the portal changes its map library.
How it works
Import existing districts or parcels as GeoJSON, or draw the plan boundary from scratch.
Split, merge and redraw land-use areas. Shared lines keep neighbouring areas flush while you work.
Open a second document for an alternative layout. Both drafts are saved in the browser as you go.
Export the selected variant as GeoJSON for the planning system, the consultation map or a GIS.
FAQ
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