
The following image is a geographic representation of Lafayette, Louisiana’s finances. It is from this excellent article by Charles Marohn.

What this 3D map shows is the city’s revenues and expenses by land parcel. The green areas are where the city is making a profit (revenues exceed expenses) and the red areas are where the city is operating at a loss (expenses exceed revenues). The height of each extrusion indicates just how much profit is being made and how much loss is being incurred.
This week Strong Towns has been running a great social media campaign called #BuildHereNow.
The way it works is very simple. They asked people to get outside and take photos of vacant and/or underutilized properties in their town or city and post them to Twitter or Instagram using the hashtag #BuildHereNow. The goal was to start to identify properties that could “use a little love" and to encourage city builders who might need a little push to develop a particular property.
I’m a big fan of crowdsourcing information and I love the idea of digitally annotating buildings and spaces. In this case, it’s about pulling together the desires of the community,
Hashtags are a great way to quickly make something like this happen, but I would love to see a purpose-built tech platform do this in a more permanent way. Of course, it doesn’t just have to be about developing. Buildings are rich in information; hopefully so rich that a platform like this could survive.
If you think about it, property titles are already a form of annotating real property. So this isn’t really a new idea.