Using GeoJSON with SQL Map Charts

According to http://geojson.org/:

GeoJSON is a format for encoding a variety of geographic data structures. A GeoJSON object may represent a geometry, a feature, or a collection of features. GeoJSON supports the following geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection. Features in GeoJSON contain a geometry object and additional properties, and a feature collection represents a list of features.

A complete GeoJSON data structure is always an object (in JSON terms). In GeoJSON, an object consists of a collection of name/value pairs -- also called members. For each member, the name is always a string. Member values are either a string, number, object, array or one of the literals: true, false, and null. An array consists of elements where each element is a value as described above.

Example of a GeoJSON document

Each feature of the GeoJSON document will look like this:

{
    "type": "Feature",
    "properties": {
        "name": "Alabama",
        "density": 94.65
    },
    "geometry": ...
    ...
}

Silota supports the value after the "geometry" key. The types supported within the geometry key are polygon, point and multipolygon.

Tutorial

Making Choropleth Maps

Full tutorial on Choropleth Maps

References


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