flatlands

Transforms a 3D GeoJSON feature geometry to 2D.

Usage

var flatlands = require('flatlands');

var multipolygon = {
  "type": "MultiPolygon",
  "coordinates": [
    [
      [
        [102.0, 2.0, 0],
        [103.0, 2.0, 0],
        [103.0, 3.0, 0],
        [102.0, 3.0, 0],
        [102.0, 2.0, 0]
      ]
    ],
    [
      [
        [100.0, 0.0, 0],
        [101.0, 0.0, 0],
        [101.0, 1.0, 0],
        [100.0, 1.0, 0],
        [100.0, 0.0, 0]
      ],
      [
        [100.2, 0.2, 0],
        [100.8, 0.2, 0],
        [100.8, 0.8, 0],
        [100.2, 0.8, 0],
        [100.2, 0.2, 0]
      ]
    ]
  ]
};

var feature = flatlands(multipolygon);

Returns:

{
  "type": "MultiPolygon",
  "coordinates": [
    [
      [
        [102, 2],
        [103, 2],
        [103, 3],
        [102, 3],
        [102, 2]
      ]
    ],
    [
      [
        [100, 0],
        [101, 0],
        [101, 1],
        [100, 1],
        [100, 0]
      ],
      [
        [100.2, 0.2],
        [100.8, 0.2],
        [100.8, 0.8],
        [100.2, 0.8],
        [100.2, 0.2]
      ]
    ]
  ]
}