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#run this on your map of points
SELECT ST_Transform(ST_ConvexHull(ST_Collect(the_geom)),3857) AS the_geom_webmercator FROM my_spottings
(adjust)
#Change the style to Custom CartoCSS because now you need to apply a polygon style as you are no longer visualizing points
#my_spottings{
polygon-fill:#FFCC00;
polygon-opacity:0.49;
line-opacity:0.49;
line-color:#FF3366;
line-width:2;
}
In the future we will have mixed geometries in columns and you would not have to do some of this tricks.
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