winnow/lib/filter-and-transform/filters/envelope-intersects.js

Apply sql-like filters to GeoJSON

const _ = require('lodash')
const { calculateBounds, intersects, contains } = require('@terraformer/spatial')
const bboxPolygon = require('@turf/bbox-polygon').default
const { arcgisToGeoJSON } = require('@terraformer/arcgis')

module.exports = function (featureGeometry = {}, filterGeometry = {}) {
  if (_.isEmpty(featureGeometry) || _.isEmpty(filterGeometry)) return false

  const normalizedFeatureGeometry = isGeoJsonGeometry(featureGeometry) ? featureGeometry : arcgisToGeoJSON(featureGeometry)

  const { type, coordinates = [] } = normalizedFeatureGeometry

  if (!type || coordinates.length === 0) return false

  const geometryFilterEnvelope = convertGeometryToEnvelopePolygon(filterGeometry)

  if (type === 'Point') return contains(geometryFilterEnvelope, normalizedFeatureGeometry)

  const featureEnvelope = convertGeometryToEnvelopePolygon(normalizedFeatureGeometry)
  return intersects(geometryFilterEnvelope, featureEnvelope)
}

function convertGeometryToEnvelopePolygon (geometry) {
  const bounds = calculateBounds(geometry)
  const { geometry: envelopePolygon } = bboxPolygon(bounds)
  return envelopePolygon
}

function isGeoJsonGeometry ({ type, coordinates }) {
  return type && coordinates
}