http://hub.qgis.org/wiki/17/Arcgis_rest
http://www.gdal.org/ogr2ogr.html
https://github.com/mbostock/topojson
ogr2ogr -f GeoJSON -t_srs EPSG:4326 tcgeo.json "http://arcserver.tclp.org/arcgis/rest/services/City/CityParcelViewer/MapServer/0/query?where=objectid+%3D+objectid&outfields=*&f=json" OGRGeoJSON