I have two .shp files, I am separately converting these to GeoJSON with ogr2ogr.exe and then combining the files with TopoJSON. Each file independently becomes a ~200kb topojson file, however the combined file is over 2mb.

It appears that one of the shapefiles has already been simplified slightly and so topojson is not finding a good correlation between the coastline arcs.

Other than trying to get a unsimplified source file, is there anything I can do to help topojson combine these files better?

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