code: function normalizeSourceSR (input) {
    let spatialReference = normalizeSR(input)
    if (spatialReference) return ((spatialReference.wkid) ? `EPSG:${spatialReference.wkid}` : spatialReference.wkt)
    if (process.env.NODE_ENV !== 'production' && process.env.KOOP_WARNINGS !== 'suppress' && input && !spatialReference) {
      console.log(`WARNING: spatial reference "${input}" could not be normalized. Defaulting to EPSG:4326.`)
    }
    return `EPSG:4326`
  }
docs: Normalize source data spatial reference; defaults to EPSG:4326
  @param {*} input
  @returns {string} EPSG:<wkid> or srs WKT; defaults to EPSG:4326