nd-geojson

Stream GeoJSON from a set of line-delimited features

Line-delimited GeoJSON features are faster and cheaper to process, but sometimes you need a FeatureCollection to visualize them, e.g. % cat line-delimited.json | nd-geojson | geojsonio.

Usage

Let's say we have a file with 10k line-delimited features:

% head -n 2 line-delimited.json
{ "type": "Feature", "geometry": { "type": "Point", "coordinates": [ -115.44, 32.62 ] } }
{ "type": "Feature", "geometry": { "type": "Point", "coordinates": [ -115.45, 32.63 ] } }

We can pipe that into nd-geojson and get a GeoJSON-compliant FeatureCollection:

% cat line-delimited.json | nd-geojson
{
  "type": "FeatureCollection",
  "features": [
    { "type": "Feature", "properties": {}, "geometry": { "type": "Point", "coordinates": [ -115.44, 32.62 ] } },
    { "type": "Feature", "properties": {}, "geometry": { "type": "Point", "coordinates": [ -115.45, 32.63 ] } },
    { "type": "Feature", "properties": {}, "geometry": { "type": "LineString", "coordinates": [ [0, 0], [0, 0], [0, 0], [0, 0] ] } }
  ]
}

A set of line-delimited features wrapped in a FeatureCollection

Install

% npm install -g nd-geojson

Kudos

Inspired by maxogden/ndjson and mcollina/split2.

Similar work: mapbox/geojson-stream builds a FeatureCollection from an array of Feature objects.