featureserver/lib/helpers/get-spatial-reference.js

*An open source implementation of the GeoServices specification*

const _ = require('lodash')
const getCollectionCrs = require('./get-collection-crs')
const normalizeSpatialReference = require('./normalize-spatial-reference')

function getSpatialReference (geojson, { inputCrs, sourceSR } = {}) {
  if (!inputCrs && !sourceSR && _.isEmpty(geojson)) return
  const spatialReference = inputCrs || sourceSR || getCollectionCrs(geojson) || { wkid: 4326, latestWkid: 4326 }

  if (!spatialReference) return

  const { latestWkid, wkid, wkt } = normalizeSpatialReference(spatialReference)

  if (wkid) {
    return { wkid, latestWkid }
  }

  return { wkt }
}

module.exports = getSpatialReference