Quick Insight
Vector tile data is vector data (points, lines, and polygons with attributes) pre-cut into a grid of square tiles, each addressed by zoom level, column, and row (z/x/y). Each tile stores clipped, simplified geometry in a compact binary encoding, most often the Mapbox Vector Tile (MVT) format built on Protocol Buffers. Unlike a raster tile, which is a finished image, a vector tile carries the raw features and leaves the drawing to the device.
How Vector Tile Data Works
- Tiling: The world is divided into a pyramid of squares. Zoom 0 is one tile for the whole world, and each zoom level splits every tile into four.
- Clipping and simplifying: Features are cut at tile edges and simplified to suit the zoom level. A city block that needs 200 vertices at street level may need only four from far away.
- Encoding: Coordinates are snapped to an integer grid inside the tile (4096 by 4096 by default in MVT) and grouped into named layers such as roads, buildings, or places.
- Rendering: A library such as MapLibre GL JS requests only the tiles in view and draws them using a separate style file.
Why Vector Tile Data Matters
- Speed: Only the visible area travels over the network, so a map with millions of features still loads quickly.
- Sharp at any zoom: Shapes are drawn fresh at each zoom level, so nothing turns blurry or pixelated.
- Restyling without reprocessing: Colors, labels, and visibility can change in the browser without regenerating the tiles.
- Interactivity: Attributes travel with the geometry, so a user can click a store and see its name, category, or brand.
Common Uses
- Web and mobile basemaps: Streets, land use, and labels in consumer map apps.
- Displaying large datasets: Showing millions of points of interest or building footprints on one map, which would overwhelm a browser if loaded as a single GeoJSON file.
- Dashboards and store locators: Store networks, sales territories, and competitor locations that users can pan, zoom, and click.
- Licensed data: Teams that work with POI data such as SafeGraph Places, or footprint polygons such as SafeGraph Geometry, often tile it for display and keep the original files for analysis.
Types of Vector Tile Data
- Mapbox Vector Tile (MVT): The format most people mean when they say vector tiles, and the most widely supported.
- MapLibre Tile (MLT): A newer, more compact format that is not yet as widely supported as MVT.
- MBTiles and PMTiles: Not tile formats themselves, but containers that pack a full set of tiles into a single file. PMTiles can sit on ordinary cloud storage.
Pros and Cons
Pros and Cons
Pros | Cons |
Small payloads: only tiles in view are downloaded. | Built for display, not measurement: geometry is clipped and simplified, so run spatial joins and area calculations on the source data. |
Crisp rendering: shapes stay sharp at every zoom. | Split features: a large site, such as an airport, spans many tiles and needs a shared ID to count as one place. |
Flexible styling: colors and labels change without rebuilding tiles. | Snapshot: when the source data changes, the affected tiles must be rebuilt. |
How Vector Tile Data Compares to Other Types
- Raster tiles: Simpler to serve and fine for imagery, but fixed in style and blurry between zoom levels. See raster data.
- GeoJSON or a shapefile: Hold full-precision features and suit analysis, but load as one whole file, which gets slow once a dataset grows large.
Want to learn more about how vector and raster formats work?
Read our full guide: Geospatial Data Types: 9 Key GIS Data Types, Examples & Formats
Frequently Asked Questions
1. Can I turn vector tiles back into the original dataset?
Only partly. You can decode tiles into features, but the geometry has already been simplified and cut at tile edges, so the result is less precise than the source and needs stitching.
2. Which zoom levels should I generate?
It depends on the data, but many tilesets stop around zoom 14. Renderers can “overzoom” past the last level by scaling the deepest tile, which saves storage without a visible loss for most uses.
3. Do vector tiles open in desktop GIS software?
Yes. QGIS and ArcGIS Pro can both load vector tile layers, though they are treated mainly as display layers, and editing is limited compared with a regular vector file.
4. What coordinate system do vector tiles use?
Usually Web Mercator (EPSG:3857). The tile grid is built on it, so source data in latitude and longitude is reprojected when the tiles are generated.
5. How do I create vector tiles from my own data?
With a tiling tool. Tippecanoe converts GeoJSON and similar files into tilesets, and PostGIS can generate tiles straight from a database, with a tile server such as Martin delivering them.
