We have received permission from our regulators to distribute non-orthorectified imagery and we believe we will be in a position to do so in the near future. If you are a Planet customer, please get in touch so that we can discuss the timeline for providing unrectified imagery with RPC metadata.
Atmospheric correction is a complex topic. As far as we are aware, no commercial imagery providers offer an “absolute atmospheric correction” product.
We are currently planning on implementing radiometric normalization (correcting our multiple scenes against a reference data set), which we believe will work for most use cases.