Un exemple de ce que l'on peut faire avec geojson et http://geojson.io

test.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "456": "sdgf"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          5.983986854553223,
          45.54985058738502
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "456": "qsdg"
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              5.976133346557616,
              45.54386969851347
            ],
            [
              5.9946298599243155,
              45.54386969851347
            ],
            [
              5.9946298599243155,
              45.55297602486606
            ],
            [
              5.976133346557616,
              45.55297602486606
            ],
            [
              5.976133346557616,
              45.54386969851347
            ]
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              5.989651679992676,
              45.554794108054224
            ],
            [
              5.961456298828125,
              45.58713413436411
            ],
            [
              5.9099578857421875,
              45.52944081525666
            ],
            [
              5.987548828125,
              45.4986468234261
            ],
            [
              6.0211944580078125,
              45.50201573698665
            ],
            [
              6.0363006591796875,
              45.55589093971315
            ],
            [
              5.989651679992676,
              45.554794108054224
            ]
          ]
        ]
      }
    }
  ]
}

:-)