This site hosts historical blue lines from Google Street View. You can overlay these on top of a map to see how the coverage changed over time.
The tiles are accessible through an API.
GET /datesList the archived dates. Returns a JSON array of objects with properties:
id: number The tileset ID. Each time the archiver runs, it creates one tileset.created_at: string The date and time the tileset was created, in UTC, formatted always as YYYY-MM-DD hh:mm:ss without timezone information.max_zoom: number The maximum Slippy zoom level that was archived for this tileset.[{ "id": 1, "created_at": "1970-01-01 00:00:00", "max_zoom": 10 }]
GET /tilesReturn an archived PNG tile image.
?set={id} required The tileset ID to look up.?x={x}, ?y={y}, ?z={z} required Slippy map coordinates.GET /diff-tilesReturn a PNG tile image representing the difference between two tiles.
?from={id} required The earlier tileset ID to base the comparison on.?to={id} required The later tileset ID to base the comparison on. This parameter can additionally take the special value ?to=now, to compare to an up-to-date tile from Google servers.?x={x}, ?y={y}, ?z={z} required Slippy map coordinates.The default behaviour is to return blue pixels where the tiles from from and to are different, and transparent pixels where the tiles are identical. The output can be modified using the color parameters:
| Parameter | Default | Description |
|-|-|-|
| color_same | transparent | Used for pixels where tiles are identical |
| color_add | value of color_diff | Used for pixels that exist in to, but not in from |
| color_remove | value of color_diff | Used for pixels that exist in from, but not in to |
| color_diff | streetview | Used for pixels that differ between to and from |
Color parameters support most CSS color formats, like hex, rgb(a), and color names, plus:
color_same=transparent - Special name for a transparent colorcolor_same=streetview - Special name to use the same color as the street view blue linesWhen using hexadecimal CSS colors, the # can be omitted, eg. f0f or aabbccdd.
If an explicit alpha component is supplied, that is used for rendering the tile. If the alpha component is omitted, a semitransparent value is used, matching the street view blue lines layer. The special names transparent and streetview always have a hardcoded alpha component.
Examples
Render just the different pixels: /diff-tiles
Render a full tile with different colors for additions and removals: /diff-tiles?color_same=streetview&color_add=f0f&color_remove=f00