add centroid coordinates to json results.

[dacresni]

commit Pandas function to calculate centroid of all polygons and add column to database.

[dacresni]

https://stackoverflow.com/questions/42877613/mapbox-gl-js-zoom-to-filtered-polygon

[dacresni]

var polygon = data.features[0].geometry.coordinates;
var fit = new L.Polygon(polygon).getBounds();
var southWest = new mapboxgl.LngLat(fit['_southWest']['lat'], fit['_southWest']['lng']);
var northEast = new mapboxgl.LngLat(fit['_northEast']['lat'], fit['_northEast']['lng']);
var center = new mapboxgl.LngLatBounds(southWest, northEast).getCenter();
// map.flyTo({center: center, zoom: 10});
map.fitBounds(new mapboxgl.LngLatBounds(southWest, northEast));

[dacresni]

or we just use this layer instead
https://stlgis.stlouis-mo.gov/arcgis/rest/services/public/STL_PUBLICMAP/MapServer/1
and then query for a single point