Compile shapes for broader geographic area

[famulare]

Seattle-only is fine for the first prototype, but we need to represent all of Western Washington. Here is a map of the collection sites feeding into this years study:

For PUMAS and Census Tracts, this is trivial as they come from the federal source. For neighborhoods, I can't find a central repository for the region, and only some towns have them. Examples with neighborhoods:

• Shoreline: http://www.shorelinewa.gov/home/showdocument?id=40628, http://www.shorelinewa.gov/our-city/maps-gis/download-gis-data
• Bellevue: https://bellevuewa.gov/city-government/departments/ITD/services/maps/g-i-s-data-portal

Without:

• Lake Forest park: https://www.cityoflfp.com/319/Maps
• Kent: https://cityofkent.maps.arcgis.com/home/gallery.html?view=grid&sortOrder=true&sortField=relevance

Taking this all in, I think we should design around PUMAS and Census Tracts, although we can potentially put in the effort to curate a metro-region map around Seattle proper.

[famulare]

I added Washington PUMAS and tracts in commit e694d2f. It would still be nice to figure out neighborhood level shapes for the region, so I'm keeping this open.

[famulare]

Longer term, any levels defined by the census have nice API access already, and so it's not clear to me that we should be curating these at all, instead of just pulling from the source.

[tsibley]

If we want background data on them, agreed. But if we want to do geospatial queries/operations against them, then we'll need the shapes locally. (And from the data integration side of things, we do need to do those queries/operations.)