I am glad that you have considered the Open Data (beta) Stack Exchange for your (open?) data question first.
I think any urgency in your need is a separate issue that has been the subject of Q&A here previously in Should Statements of Urgency be removed from Questions? so I am going to focus on whether your proposed questions would appear to be on-topic here.
Our community's attitude to that has been the subject of Q&A here previously too in Are questions about obtaining geospatial data on topic? and it seems to me that questions tagged data are not always welcomed but they can be considered on-topic.
When asking data questions on Main I would recommend that you pay particular attention to describing what you have already done to try and answer your own question prior to posting here. In the case of cross-posting https://opendata.stackexchange.com/questions/6778/free-quad-polarization-sar-images-of-san-francisco-in-bands-x-and-l I think you should start with a link to that, and also add a comment to your question there to say that you have now also asked here, and why.
