When I read the challenge brief, one sentence stopped me: "ordinary folk who have access to smartphones." That changed everything.
I did not start with code. I started with the problem. UNDP's RAPIDA methodology uses satellites to assess crisis damage within 72 hours. But satellites cannot tell you if a hospital is still open. They cannot see if debris is blocking the only road out of a neighbourhood. Communities can. The gap between what satellites see and what people on the ground know is where lives are lost.