D3 exploration using the state of Oregon as a focus
Source Data and Workflow(s):
County Boundaries Shapefile - Oregon 1990 County Boundaries. Source: Census Bureau TIGER files, 1:100,000 - http://navigator.state.or.us/sdl/data/shapefile/k100/county.zip
Workflow 1 (Dropping attributes):
Coordinate reference system changed to EPSG:4326 (WGS 84) from EPSG:2992 (NAD83/Oregon Lambert (ft)) using QGIS 2.8.1
http://www.mapshaper.org/ used to simplify original .shp to 2.5% and 2 line intersections fixed
GeoJSON exported as oregon.geo.json and validated at http://geojsonlint.com/
TopoJSON exported as oregon.topo.json
Workflow 2
GDAL via OSGeo4W Shell: ogr2ogr -f GeoJSON -t_srs crs:84 oregon.geojson oregon.shp
US Drought Monitor Shapefile - 20150310
National Drought Mitigation Center (NDMC), the U.S. Department of Agriculture (USDA) and the National Oceanic and Atmospheric Association (NOAA) - http://droughtmonitor.unl.edu/Home.aspx
Coordinate reference system changed to EPSG:4326 (WGS 84)
http://www.mapshaper.org/ used to simplify original .shp to 2.5% and 2 line intersections fixed
GeoJSON exported as usdm_20150310.geo.json