Slim down geojson

[abettermap]

It's kinda meaty, ~2ish MB now. Make it smaller via:

• Remove unneeded fields (e.g. SHAPE_LEN, etc.)
• Simplify/reduce vertices
• Reduce coordinate precision (e.g. 40.374187379751248 to 40.37419)
• Minify and commit

Other:

• Test it: zoom in really far, see if vertices look suffish
• Screenshot the old-vs-new savings (just cuz)
• Document procedures (use ogr2ogr if no Node-based modules available)

Wishlist: topojson!

[abettermap]

Savings

Almost 90%:

Still precise enough?

If not, I can slim it down more, but this project deals with large precinct-level data so probably fine as-is. Still looks deese around 1:27000 scale:

...albeit a bit rougher at 1:6900:

TopoJSON savings

Just for shits and giggles (mostly giggles), topojson cuts the slimmed GeoJSON by another 50%:

We would need to adapt the MapBox code to handle it, but it's plenty doable.

[deidyomega]

Considering the size reduction. I think it's close enough. This isn't for land surveying, this is for getting a general idea.

Great work!