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What imagery licenses are compatible with this index?

  • ✅ "Public Domain" or Creative Commons (CC0) imagery sources are directly compatible with tracing on OpenHistoricalMap. Attribution of a Public Domain source is not required, but is encouraged, to appear in the .geojson source file.

  • ✅ Open Government Licence (OGL) imagery sources are also compatible with tracing and do not require any additional permission. Attribution of an OGL source is required to appear in the .geojson source file.

  • ❓ Creative Commons with condition (CC BY, CC BY-NC, CC BY-SA) imagery sources are directly compatible with tracing on OpenHistoricalMap. Attribution of Creative Commons sources is required.

  • ❓ For any other imagery sources - open an issue and we will look into it! There may be language in the imagery metadata or elsewhere on the owning organizations's website that makes things clear. In situations where the license is unclear, you can also request the owning organization to grant permission using the general waiver.

Where can I find an imagery license waiver?

Visit the link below and choose the link for "Template text for aerial imagery waivers".
Within that document are variations for general and creative commons waivers.

https://wiki.osmfoundation.org/wiki/Licence/Waiver_and_Permission_Templates

Completed imagery waivers should be stored in this repository in the same location as the corresponding .geojson source files. Please save the completed waiver as a .pdf, using the a similar name as the .geojson source file.
(For example NYS2017-orthos.geojson, NYS2017-orthos-waiver.pdf)

How can I draw a bounding polygon?

You can use http://geojson.io to draw a polygon.

Download.geofabrik.de has free .poly files that geojson.io can import.

Geojson.io will even let you add a tile-based imagery layer to the map. This lets you see where the imagery is valid.

  1. Choose Meta -> Add map layer from the menu
  2. Enter the url, as you would if you were adding the source as a custom layer in iD. Note: you do need to use {z} instead of {zoom} on geojson.io

Tips for drawing the polygon:

  1. Click "Draw A Polygon" button to get started - it looks like a pentagon shape.
  2. You don't need to be super detailed, just roughly trace around where the imagery is valid.
  3. Double click to stop drawing.
  4. If you want to change the shape, click the "Edit Layers" button - it looks like a square with pencil in it.
  5. In edit mode you can move or click once to delete existing points, or drag midpoints to create new points.