Going from Market to Sub-market analysis (esp. OOS)

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I would like to ask for advice on how to start moving from a developing ability for general market analysis to more subtle sub-market analysis. 

If I have a broad urban market in mind, I am getting comfortable looking into aspects such as property prices relative to features, rents, occupancy rates, employment rates, etc. that I figure are part of research into the overall market in that area. 

My request is to hear different tips and/or tools for moving into an increased ability to analyze the sub-markets within that larger market. What are some things that work to get a real pulse on sub-markets of that same larger market? I've been reading @David Greene's Long Distance Real Estate Investing (not finished yet) which has some good tips, even about using tools like realty websites to overlay crime maps, look at schools, etc., but I'd love to hear more. 

What creative or out of the box things help investors (especially those looking at OOS markets) begin to really get a nuanced understanding of an area?