The main APGB WMS feed provides the following layers:
- 12.5cm aerial photographic layer of Great Britain giving the most recent imagery for a given layer.
- 25cm aerial photographic layer of Great Britain giving the most recent imagery for a given layer.
- Most recent 50cm colour infrared photographic imagery of Great Britain.
- Separate index overlay layers for these three imagery layers. These display a 1km2 grid that can be displayed over the top of the matching photographic layer. Calls can be made to these layers to obtain the flown dates for each square kilometre block.
- Layers of historic aerial photography going back to 1999. Each layer is mostly from one year. Many of the datasets were edge-matched into older years (so they could be overlayed on the older imagery layers) so it is common to find blocks with older years at the edge of these image areas.
- Separate index overlay layers for each of these historic layers. These display a 1km2 grid that can be displayed over the top of the matching photographic layer. Calls can be made to these layers to obtain the flown dates for each square kilometre block.
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