Interesting idea, @system123! I've followed the development a little but haven't tried it out myself yet. Sur looks promising. I'll give this issue a help wanted label as I might not be able to look into it in the near future. Maybe you or somebody else would like to collect some ideas here or develop something right away..

I'm happy to take a look at it when I get a free moment - but when I start work on it I will post here, in case someone else wants to give it some attention before then.

I have a workflow to get custom RTC from Planetary Computer and thought of handling the downloaded scenes with pyroSAR to reduce duplicates. Maybe we can use some of that?

@MarkusZehner are the MPC products processed with sarsen? I know they financed the RTC implementation in it but always thought that the products are still processed using Catalyst:
https://planetarycomputer.microsoft.com/dataset/sentinel-1-rtc

@johntruckenbrodt the linked gist downloads GRD and COP GLO-30 from MPC and uses sarsen to process locally to RTC. The RTC data available at MPC has visibly worse correction: https://github.com/microsoft/PlanetaryComputerExamples/blob/main/tutorials/customizable-rtc-sentinel1.ipynb

@MarkusZehner I misinterpreted your message above and thought you directly get the RTC products from Planetary Computer (PC). I now understand that you do your own custom processing based on sarsen with some modifications (and just get the GRD products from PC). This is really interesting, especially since you mentioned that sarsen processes each polarization by its own instead of reusing the RTC correction layer for each (as it should be). Moreover, there hasn't been much activity in the sarsen repo lately so I wonder whether it is worth the effort.

This was interesting unfortunately it looks like Sarsen development has stalled and may not be worth adding for now.

@whatnick yes unfortunately this is the case. However, B-Open, the company behind it, is currently actively developing Python SAR processors which will go open-source eventually. I don't know whether this will be part of sarsen though.