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var mapnik = require('mapnik');

var proj4 = '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over';
var mercator = new mapnik.Projection(proj4);

/**
 * SphericalMercator constructor: precaches calculations
 * for fast tile lookups
 */
function SphericalMercator() {

knutole

Wu.DomEvent.on(box, 'keydown', this._throttledSave, this);

_throttledSave : function () {
  _.throttle(this.save, 1000); 
},

save : function () {
  var text = div.innerHTML;
  this._project.setText(text);
}

knutole

SELECT ST_Transform(ST_Intersection(lg.geometry, bbox.geom), 4326) As geometry, 
SELECT "name","type","area","z_order"  As properties FROM osm_landusages As lg, (
SELECT ST_Transform(ST_MakeEnvelope(-2.8125,38.82259097617711,25.312499999999986,57.326521225217064, 4326),3857) as geom) as bbox
WHERE ST_Intersects(lg.geometry, bbox.geom)
AND (area > 200000000);

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SELECT row_to_json(fc) FROM ( 
SELECT ST_AsGeoJSON(ST_Transform(ST_Intersection(lg.geometry, bbox.geom), 4326))::json As geometry, ( 
SELECT row_to_json(t) FROM ( 
SELECT "name","type","area","z_order") t ) As properties FROM osm_landusages As lg, (
SELECT ST_Transform(ST_MakeEnvelope(-2.8125,38.82259097617711,25.312499999999986,57.326521225217064, 4326),3857) as geom) as bbox 
WHERE ST_Intersects(lg.geometry, bbox.geom)  
AND (area > 200000000) ) fc;

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EXPLAIN ANALYZE VERBOSE SELECT ST_AsGeoJSON(ST_Intersection(lg.geometry, bbox.geom)) As geometry, ( SELECT rowea","z_order") t ) As properties FROM osm_landusages As lg, (SELECT ST_Transform(ST_MakeEnvelope(-2.8125,38.822590974, 4326),3857) as geom) as bbox WHERE ST_Intersects(lg.geometry, bbox.geom)  AND (area > 200000000) ;

knutole

SELECT row_to_json(fc) FROM (
SELECT ST_AsGeoJSON(ST_Transform(ST_Intersection(lg.geometry, bbox.geom), 4326))::json As geometry, (
SELECT row_to_json(t) FROM (
SELECT "name","type","area","z_order") t ) As properties FROM osm_landusages As lg, (
SELECT ST_Transform(ST_MakeEnvelope(-2.8125,38.82259097617711,25.312499999999986,57.326521225217064, 4326),3857)
  as geom) as bbox
WHERE ST_Intersects(lg.geometry, bbox.geom)
AND (area > 200000000) ) fc;

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                    List of relations
 Schema |             Name              | Type  |  Owner
--------+-------------------------------+-------+----------
 public | ne_bathymetry                 | table | osm
 public | ne_urban_areas                | table | osm
 public | osm_admin                     | table | osm
 public | osm_aeroways                  | table | osm
 public | osm_amenities                 | table | osm
 public | osm_barrierpoints             | table | osm
 public | osm_barrierways               | table | osm

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Indexes:
    "ne_bathymetry_pkey" PRIMARY KEY, btree (gid)
    "ne_bathymetry_geom_idx" gist (geometry)
    "ne_bathymetry_geom_idx1" gist (geometry)
    "ne_bathymetry_geom_idx10" gist (geometry)
    "ne_bathymetry_geom_idx2" gist (geometry)
    "ne_bathymetry_geom_idx3" gist (geometry)
    "ne_bathymetry_geom_idx4" gist (geometry)
    "ne_bathymetry_geom_idx5" gist (geometry)
    "ne_bathymetry_geom_idx6" gist (geometry)

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SELECT row_to_json(fc) FROM ( SELECT ST_AsGeoJSON(ST_Transform(ST_Intersection(ST_MakeValid(lg.geometry), bbox.geom), 4326))::json As geometry, ( SELECT row_to_json(t) FROM ( SELECT "name","type","area") t ) As properties FROM osm_waterareas As lg, (SELECT ST_Transform(ST_MakeEnvelope(-7.031250000000009,36.59788913307019,-5.625000000000013,37.718590325588146, 4326),3857) as geom) as bbox WHERE ST_Intersects(ST_MakeValid(lg.geometry), bbox.geom)  AND (area > 12500000) ) fc;

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SELECT row_to_json(fc)
FROM (
  SELECT ST_AsGeoJSON(ST_Transform(ST_Intersection(lg.geometry, bbox.geom), 4326))::json As geometry,
  (
    SELECT row_to_json(t)
    FROM (
      SELECT name, type, admin_level
    ) t
  )
As properties