Interesting idea connecting urban slums. This relates to some of the work that I'm doing in Stewarding Technology and Communities of Practice (Wenger et al); although our focus in this current project is in agricuture the concepts can be applied to any group: http://mobilizingknowledge.blogspot.hk/2015/09/the-future-of-knowledge-sharing-in.html
Essentially, what you are addressing is a community of practice involving experts in climate change adaptation and urban slum communities. Mapping, Texting, and Voice-enabled ICT tools are easy-to-use and rapidly prototype knowledge mobilization within the community of practice.
Games, game-sourcing, or play-sourcing help incentive such communities to engage.