mapbox-gl-ogc-feature-collection

A small package for requesting geojson from an OGC Feature API endpoint to serve tiles in MapBox/MapLibre.

Built with inspiration from mapbox-gl-arcgis-featureserver.

Demo

Check out the demo at this link. This demo pulls in large lakes OGC Feature API collection at https://demo.pygeoapi.io/stable. In the demo, we are using the collection lakes.

Basic Usage

import OGCFeatureCollection from 'mapbox-gl-ogc-feature-collection'

map.on('load', () => {
    const sourceId = 'collection-src'

    new OGCFeatureCollection(sourceId, map, {
        url: 'https://demo.pygeoapi.io/stable',
        collectionId: 'lakes',
        limit: 10000
    })

    map.addLayer({
        'id': 'lyr',
        'source': sourceId,
        'type': 'fill',
        'paint': {
            'fill-color': '#B42222',
            'fill-opacity': 0.7
        }
    })
})

API

This library exposes a single OGCFeatureCollection class

Constructor Options

Option	Type	Description
sourceId	String required	A string
map	Object required	A mapbox-gl or maplibre-gl map instance.
collectionOptions	Object required	A range of options which will be used to manage the collection. See below.
geojsonSourceOptions	Object	A object which will be passed to the creation of the mapbox-gl geojson source

Collection Options

Option	Type	Default	Description
url	String required		The base url of the OGC Feature API. https://demo.pygeoapi.io/covid-19.
collectionId	String required		The name of the collection. cases_country.
limit	Number	5000	Number of features to return in each tile.
properties	String		List of properties to return for each feature.
datetime	Date		Date or date range to filter items.
bbox	String		Apply bbox to items to only show in certain area. -180,-90,180,90
useStaticZoomLevel	Boolean	false	Whether to only get tiles at a single zoom level. If true then set minZoom to the desired level.
minZoom	Number	if useStaticZoom is true then 7, otherwise 2	The zoom level to start requesting tiles.

Methods

Method	Description
destroySource()	Important The destroySource() method removes the source from the map and associated event listeners for retrieving data which request data as the map is panned, so it's important to call this method if removing the layer from the map completely.
disableRequests()	Important The disableRequests() method temporarily disables the associated event listeners for retrieving data which request data as the map is panned, you may want to call this if you toggle your layer off.
enableRequests()	Important The enableRequests() method enables the associated event listeners for retrieving data which request data as the map is panned. By default this is called by the constructor.

Example of disabling and enabling requests

It would be nice if disabling/enabling of requests happened automatically but unfortunately I haven't found a way to make that happen because of how sources and layers are managed in mapbox-gl.

import OGCFeatureCollection from 'mapbox-gl-ogc-feature-collection'

map.on('load', () => {
    const sourceId = 'collection-src'
    const lyrId = 'lyr'

    const service = new OGCFeatureCollection(sourceId, map, {
        url: 'https://demo.pygeoapi.io/stable',
        collectionId: 'lakes',
        limit: 10000
    })

    map.addLayer({
        'id': 'lyr',
        'source': sourceId,
        'type': 'fill',
        'paint': {
            'fill-color': '#B42222',
            'fill-opacity': 0.7
        }
    })
})
    
    
function hideFsLayer () {
    map.setLayoutProperty(lyrId, 'visibility', 'none')
    service.disableRequests()
}
function showFsLayer () {
    map.setLayoutProperty(lyrId, 'visibility', 'visible')
    service.enableRequests()
}
function removeFsCompletelyFromMap () {
    map.removeLayer(lyrId)
    service.destroySource()
}