There are OpenStreetMap (OSM) tools to extract buildings from selected regions. OSM extraction tool is one such utility, link.
Customized neighborhood maps can be created with extensions (hiring, help, events etc.) that community benefits. These could be overlaid with the blueprints of the colony.
OSM is an open mapping platform (unlike Google maps). Several products and services leverage OSM (ex: mapbox). Previously, I mapped multiple entities (health facilities, plots, parks etc.) in our colony and nearby places. Take a look at the contributions.
Communities around the world organize mapathons inviting user contributions. We could organize some to extend the coverage of the mapping in our locality and other places of interest.
Elevation data is shared by NASA and subsequently other downstream services. Google elevation API too provides elevation attribute for a given latitude and longitude. This can be used to construct elevation maps which will be useful to citizens while (re-)constructing houses, (re-)building culverts for rain water and other purposes.
Weather stations that monitor rainfall can be placed at strategic locations in neighborhoods (if existing station data is not leveraged). Combined with local and elevation maps, augmented weather information will be crucial for citizens and local businesses.
SEPRWA (association) maintains physical records of different documents for record keeping. 2020 floods damaged some of the files prompting the digitization idea.