Test Geobuf vs Geojson vs CSV

[brendan-ward]

For the draft dams database (1/2 of GCPO region) with 18k points (small subset!):

• GeoJSON: 61 MB
• GeoBuf: 25 MB
• TopoJSON: 55 MB
• CSV: 8.5 MB

[brendan-ward]

Zipped up these are:

• GeoJSON: 3.2 MB
• GeoBuf: 2.4 MB
• TopoJSON: 3.1 MB
• CSV: 2.3 MB