Convert an AutoCAD DXF file's contents to GeoJSON — e.g. "convert
this DXF to GeoJSON", "AutoCAD drawing to GIS format", "DXF export from
Civil 3D to GeoJSON", "extract only the UTILITIES layer from this DXF".
POINT/LINE/LWPOLYLINE/POLYLINE/ARC/CIRCLE entities convert (arcs/circles
are tessellated into LineString/Polygon); splines, text, hatches and 3D
solids have no GIS geometry equivalent and are skipped, not errored on.
Every feature's properties.layer carries its DXF layer name (group code
8). Pass `layer` to return only that layer's entities — see
list_dxf_layers to discover what layer names exist first.
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