What is fast-rectification?
Fast-rectification is publication of the first orthorectification of a SkySatScene, which relies on coarse “Seth” RPCs rather than the bundle adjusted (“BA”) RPCs used for full rectification. This results in a high absolute positional accuracy (near matching full rectification), but a slightly degraded relative / scene-to-scene accuracy, with an average ~4m RMSE rather than the ~1m RMSE achieved with full rectification.
Does fast-rectification apply to all assets?
No, fast-rectification only applies to Scenes, hence SkySatCollects will not publish early.
How long does fast-rectification take?
The typical latency for a Scene that’s been fast-rectified is ~4 hours, that’s between capture and publication (hence the Scene spends about ~2 hours in the processing Pipeline). This is roughly 2 to 4 hours faster than the fully rectified product.
Will all customers receive fast-rectification?
No, initially fast-rectification will only be available for Assured Tasking customers, as an upsell for purchasing the Assured product.
Will customers be able to see fast-rectification Scenes in Explorer?
Yes, but only the Assured customers that tasked the image, due to the one month publication delay associated with SDA. The fast-rectification is replaced by the full-rectification, hence archive customers will only see the full rectification product once it publishes broadly.
Is there a parameter in metadata to indicate whether a Scene has fast or full rectification?
Yes, the publishing_stage parameter has been added to all SkySat assets, where ‘preview’ represents fast-rectification (and L1A) and ‘finalized’ represents full rectification.