tidwall 6257ddba78 Faster point in polygon / GeoJSON updates
The big change is that the GeoJSON package has been completely
rewritten to fix a few of geometry calculation bugs, increase
performance, and to better follow the GeoJSON spec RFC 7946.

GeoJSON updates

- A LineString now requires at least two points.
- All json members, even foreign, now persist with the object.
- The bbox member persists too but is no longer used for geometry
  calculations. This is change in behavior. Previously Tile38 would
  treat the bbox as the object's physical rectangle.
- Corrections to geometry intersects and within calculations.

Faster spatial queries

- The performance of Point-in-polygon and object intersect operations
  are greatly improved for complex polygons and line strings. It went
  from O(n) to roughly O(log n).
- The same for all collection types with many children, including
  FeatureCollection, GeometryCollection, MultiPoint, MultiLineString,
  and MultiPolygon.

Codebase changes

- The pkg directory has been renamed to internal
- The GeoJSON internal package has been moved to a seperate repo at
  https://github.com/tidwall/geojson. It's now vendored.

Please look out for higher memory usage for datasets using complex
shapes. A complex shape is one that has 64 or more points. For these
shapes it's expected that there will be increase of least 54 bytes per
point.
2018-10-13 04:30:48 -07:00

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JSON

{
"type":"FeatureCollection",
"features":[
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2]},"properties":null,"id":1234},
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2,3]},"properties":null,"id":1234},
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2,3,4]},"id":"hello"},
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2,3],"bbox":[1,2,3,4]}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2,3],"bbox":[1,2,3,4,5,6]}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2,3],"bbox":[1,2,3,4,5,6,7,8]}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2],"bbox":[1,2,3,4,5,6,7,8]}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[1,2]}},
{"type":"Feature","geometry":{"type":"MultiPoint","coordinates":[]}},
{"type":"Feature","geometry":{"type":"MultiPoint","coordinates":[[1,2]]}},
{"type":"Feature","geometry":{"type":"MultiPoint","coordinates":[[1,2,3]]}},
{"type":"Feature","geometry":{"type":"MultiPoint","coordinates":[[1,2,3,4]]}},
{"type":"Feature","geometry":{"type":"MultiPoint","coordinates":[[1,2,3,4],[1,2],[1,2,3]]}},
{"type":"Feature","geometry":{"type":"MultiPoint","coordinates":[[1,2,3,4],[1,2],[1,2,3]],"bbox":[1,2,3,4]},"bbox":[2,3,4,5]},
{"type":"Feature","geometry":{"type":"LineString","coordinates":[]}},
{"type":"Feature","geometry":{"type":"LineString","coordinates":[[1,2]]}},
{"type":"Feature","geometry":{"type":"LineString","coordinates":[[1,2,3]]}},
{"type":"Feature","geometry":{"type":"LineString","coordinates":[[1,2,3,4]]}},
{"type":"Feature","geometry":{"type":"LineString","coordinates":[[1,2,3,4],[1,2,0,0],[1,2,3,0]]}},
{"type":"Feature","geometry":{"type":"LineString","coordinates":[[1,2,3,4],[1,2,0,0],[1,2,3,0]],"bbox":[1,2,3,4]},"bbox":[2,3,4,5]},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[]}},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[]]}},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[[1,2]]]}},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[[1,2,3]]]}},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[[1,2,3,4]]]}},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[[1,2,3,4],[1,2,0,0],[1,2,3,0]]]}},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[[1,2,3,4],[1,2,0,0],[1,2,3,0]]],"bbox":[1,2,3,4]},"bbox":[2,3,4,5]},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[[1,2]],[]]}},
{"type":"Feature","geometry":{"type":"MultiLineString","coordinates":[[[1,2,3]],[[1,2,3],[4,5,6]]]}},
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]]}},
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]],"bbox":[1,2,3,4]}},
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]]],"bbox":[1,2,3,4]}},
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]]]}},
{"type":"Feature","geometry":{"type":"GeometryCollection","geometries":[]}},
{"type":"Feature","geometry":{"type":"GeometryCollection","geometries":[],"bbox":[1,2,3,4,5,6]}},
{"type":"Feature","geometry":{"type":"GeometryCollection","geometries":[
{"type":"Point","coordinates":[1,2]},
{"type":"Point","coordinates":[1,2,3]},
{"type":"Point","coordinates":[1,2,3,4]},
{"type":"Point","coordinates":[1,2,3],"bbox":[1,2,3,4]},
{"type":"Point","coordinates":[1,2,3],"bbox":[1,2,3,4,5,6]},
{"type":"Point","coordinates":[1,2,3],"bbox":[1,2,3,4,5,6,7,8]},
{"type":"Point","coordinates":[1,2],"bbox":[1,2,3,4,5,6,7,8]},
{"type":"Point","coordinates":[1,2]},
{"type":"MultiPoint","coordinates":[]},
{"type":"MultiPoint","coordinates":[[1,2]]},
{"type":"MultiPoint","coordinates":[[1,2,3]]},
{"type":"MultiPoint","coordinates":[[1,2,3,4]]},
{"type":"MultiPoint","coordinates":[[1,2,3,4],[1,2],[1,2,3]]},
{"type":"MultiPoint","coordinates":[[1,2,3,4],[1,2],[1,2,3]],"bbox":[1,2,3,4]},
{"type":"LineString","coordinates":[]},
{"type":"LineString","coordinates":[[1,2]]},
{"type":"LineString","coordinates":[[1,2,3]]},
{"type":"LineString","coordinates":[[1,2,3,4]]},
{"type":"LineString","coordinates":[[1,2,3,4],[1,2,0,0],[1,2,3,0]]},
{"type":"LineString","coordinates":[[1,2,3,4],[1,2,0,0],[1,2,3,0]],"bbox":[1,2,3,4]},
{"type":"MultiLineString","coordinates":[]},
{"type":"MultiLineString","coordinates":[[]]},
{"type":"MultiLineString","coordinates":[[[1,2]]]},
{"type":"MultiLineString","coordinates":[[[1,2,3]]]},
{"type":"MultiLineString","coordinates":[[[1,2,3,4]]]},
{"type":"MultiLineString","coordinates":[[[1,2,3,4],[1,2,0,0],[1,2,3,0]]]},
{"type":"MultiLineString","coordinates":[[[1,2,3,4],[1,2,0,0],[1,2,3,0]]],"bbox":[1,2,3,4]},
{"type":"MultiLineString","coordinates":[[[1,2]],[]]},
{"type":"MultiLineString","coordinates":[[[1,2,3]],[[1,2,3],[4,5,6]]]},
{"type":"Polygon","coordinates":[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]]},
{"type":"Polygon","coordinates":[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]],"bbox":[1,2,3,4]},
{"type":"MultiPolygon","coordinates":[[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]]],"bbox":[1,2,3,4]},
{"type":"MultiPolygon","coordinates":[[[[1,2,3],[1,2,3],[4,5,6],[1,2,3]]]]},
{"type":"GeometryCollection","geometries":[]},
{"type":"GeometryCollection","geometries":[],"bbox":[1,2,3,4,5,6]}
]}}
]
}