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This is my first D3 Block, and I'm still working on it, try hard to learn. :)
Download from here, extract them, and use the commands below:
$ ogr2ogr -f GeoJSON -where "C_Name IN ('高雄市')" municipality.json County_MOI_1041215.shp
$ ogr2ogr -f GeoJSON -where "C_Name IN ('高雄市')" town.json Town_MOI_1041215.shp
$ topojson -o kh.json --id-property OBJECTID --properties name=NAME --shapefile-encoding big5 municipality.json town.json