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Status](https://travis-ci.com/mapbox/tilelive-vector.svg?branch=master)](http://travis-ci.com/mapbox/tilelive-vector)\n[![Coverage Status](https://coveralls.io/repos/mapbox/tilelive-vector/badge.svg?branch=master\u0026service=github)](https://coveralls.io/github/mapbox/tilelive-vector?branch=master)\n\n### new Vector(options, callback)\n\n- *xml*: a Mapnik XML string that will be used to render vector tiles.\n- *source*: Optional, a uri string suitable for use with `tilelive.load()`. This is fallback source that will be used if no source is found as part of the Mapnik XML parameters.\n- *base*: Optional, basepath for Mapnik map. Defaults to `__dirname`.\n- *format*: Optional, target output format. Defaults to `png8:m=h`.\n- *scale*: Optional, Mapnik scale factor. Defaults to `1`.\n\n### Code concepts\n\n- *Backend z/x/y*: a request for a raster tile at, say, 3/3/3 does not always mean 3/3/3 is requested from the backend source. The z/x/y requested from the backend source is referred in code by `bz/bx/by` and generally represent the same or lower zoom level. This allows for features like *overzooming*, *maskLevel tiles*, and *scale factor adjustment*.\n- *Overzooming*: if a tile beyond the `maxzoom` of the backend is requested, Vector will attempt to render the tile using the parent of the request at `maxzoom`.\n- *maskLevel tiles*: to avoid requiring many duplicate or empty vector tiles to be generated at high zoom levels, the backend source can specify a `maskLevel`. If a vector tile is not initially found at some `z \u003e maskLevel`, Vector will issue an additional request to the backend using the parent tile of of the request at `maskLevel`. This allows a lower zoom level to \"backfill\" high zoom levels.\n- *Scale factor adjustment*: the scale argument decrements the backend zoom level such that the requested tile is the visual equivalent (when viewed on the proper dpi device) of its parent counterpart. For example, `scale: 2` decrements `bz` by 1, `scale: 4` decrements by 2, and so on.\n\n### Backend headers\n\nThe Backend and Vector sources set the `x-vector-backend-object` header to indicate the type of backend source tile loaded. 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