Regions

[annehaley]

For @AlmightyYakob to take over. The below items are my current understanding of the task, but this may be further refined.

• [x] Create Region model
• [x] Populate Region objects from the Boston census blocks dataset
• [x] Add a UI widget to select a Region in the current city and crop the visualization to the boundary
• [ ] Allow more complex spatial queries in the widget to combine Regions (union, intersection)
• [ ] Allow user to save Region combinations as new named Region objects

[jjnesbitt]

@annehaley I'd like to address the last 2 items of that checklist in a follow-up PR. The current change is pretty well scoped, and those last two items could involve a decently large change themselves.

[annehaley]

@annehaley I'd like to address the last 2 items of that checklist in a follow-up PR. The current change is pretty well scoped, and those last two items could involve a decently large change themselves.

Makes sense. I can review this PR as-is later today.

[annehaley]

I tried out the zoom to region feature a lot, and it works fine for most regions. The only one I found that did not work as expected was the Jamaica Plain region. This is what it zoomed to:

[jjnesbitt]

It seems that both of those polygons are a part of the same region. See below where I clicked on the "main" part of it. You'll notice that in both your screenshot and in mine, the map zooms to fit both regions.

Both areas are connected by a thin strip that runs along the boundary for "Longwood". I tried to verify that this is the correct boundary and wasn't a data ingress error by loading the Jamaica Plain feature into a separate online viewer, but it doesn't render it for some reason. The screenshot below shows that thin connecting piece

[annehaley]

Oh ok, thanks for clarifying! It seems to be working properly then! I had clicked on the tiny portion and thought that was the whole Region. Perhaps this is a good reason to go back to trying to color them uniquely... But that can be saved for later.