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Update README.md to include ndjson-cli suggestion

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Most software in the ecosystem is unable to write arbitrary data to the tippecanoe object, so it might be helpful to show how users can make these GeoJSON extensions work. #685
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Andrew Harvey 2019-03-11 16:40:59 +11:00 committed by GitHub
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@ -617,6 +617,12 @@ the filename or name specified using `--layer`, like this:
}
```
If your source GeoJSON only has `minzoom`, `maxzoom` and/or `layer` within `properties` you can use [ndjson-cli](https://github.com/mbostock/ndjson-cli/blob/master/README.md) to move them into the required `tippecanoe` object by piping the GeoJSON like this:
```sh
ndjson-map 'd.tippecanoe = { minzoom: d.properties.minzoom, maxzoom: d.properties.maxzoom, layer: d.properties.layer }, delete d.properties.minzoom, delete d.properties.maxzoom, delete d.properties.layer, d'
```
Geometric simplifications
-------------------------