geojson-lookup v1.1.4

geojson-lookup

ITS ALL ABOUT SPEED and no alteration to your GEOJSONs

Lookup Geojson feature collections by indexing them by feature properties (INDEX TABLES) and by a Geometry (R-TREE) all in memory.

###Usage

1) Install through npm

npm install geojson-lookup

2) Require the module

var geoIndex = require("geojson-lookup");

3) Initialize by passing Properties to indexBy and by passing a geoJson

var geo = geoIndex.buildIndex([ PROPERTIES_TO_INDEX ],GEOJSON_OBJECT);

example:
var geo = geoIndex.buildIndex(["areaType","parentId"],geojs);

4) Query your polygon by indexed property

• Start by creating an instance of the Querying mechanism var geoQuery = new geoIndex.Queries();
• Call the query method on the instantiated object as .query(INDEXED_PROPERTY, OPERATOR("==" or "!="), VALUE_TO_QUERY)
• Now you can chain .and() , or.() to your query with the same parameter as .query()

• Once done call the method .get() to get your results as an [ ARRAY_OF_FEATURES ]

  example:
  var resByProp = (geoQuery.query("areaType", "!=" ,'1').and("parentId", "=", "null").or("areaType","=","3").get());

  5) You can query by Lattitude and Longitude

  geoQuery.getByPoint(LAT, LONG)

  example:
  var resByPoint = geoQuery.getByPoint(28.98066, 36.25222);

  returns [ ARRAY_OF_FEATURES ]