Architect how FeatureSever layers will be referenced in the STAC Catalog

[slesaad]

Description

EIC data wishlist consists of datasets from ArcGIS ImageServer, MapServer and FeatureServer. Visualizing ImageServer and MapServer with WMS enabled is mostly figured out. Next is FeatureServer.

It seems like a FeatureServer layer can be converted to a GeoJSON object if the fieldsupportedQueryFormats lists geoJSON.
This basically involves making a request to the layer's /query endpoint with f=pgeojson.

An example:
https://services2.arcgis.com/FiaPA4ga0iQKduv3/ArcGIS/rest/services/IBTrACS_ALL_list_v04r00_lines_1/FeatureServer/0/query?where=1%3D1&objectIds=&time=&geometry=&geometryType=esriGeometryEnvelope&inSR=&spatialRel=esriSpatialRelIntersects&resultType=none&distance=0.0&units=esriSRUnit_Meter&relationParam=&returnGeodetic=false&outFields=*&returnGeometry=true&returnEnvelope=false&featureEncoding=esriDefault&multipatchOption=xyFootprint&maxAllowableOffset=&geometryPrecision=&outSR=&defaultSR=&datumTransformation=&applyVCSProjection=false&returnIdsOnly=false&returnUniqueIdsOnly=false&returnCountOnly=false&returnExtentOnly=false&returnQueryGeometry=false&returnDistinctValues=false&cacheHint=false&orderByFields=&groupByFieldsForStatistics=&outStatistics=&having=&resultOffset=&resultRecordCount=&returnZ=false&returnM=false&returnExceededLimitFeatures=true&quantizationParameters=&sqlFormat=none&f=pgeojson&token=

Most of the query params passed here are default values, the only ones that I passed are:

where: 1=1
outFields: *
f: pgeojson

This provides the data in geojson, which should be simple enough to add to the map using mapbox's methods:

map.addSource('earthquakes', {
    type: 'geojson',
    // Use a URL for the value for the `data` property.
    data: 'https://docs.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson'
});

map.addLayer({
    'id': 'earthquakes-layer',
    'type': 'circle',
    'source': 'earthquakes',
    'paint': {
        'circle-radius': 4,
        'circle-stroke-width': 2,
        'circle-color': 'red',
        'circle-stroke-color': 'white'
    }
});

Soooo,
we could use similar strategy we used for the (vector) eis fire perimeter dataset (https://staging-stac.delta-backend.com/collections/eis_fire_perimeter) to publish it to the VEDA data catalog. Basically, create a collection with metadata from the arcgis server and have a link object that points to the geojson.

[smohiudd]

Here is the documentation on how to query the FeatureSever layer:
https://developers.arcgis.com/rest/services-reference/enterprise/query-feature-service-layer/

[smohiudd]

FeatureServer datasets may have multiple layers. We need to reference the layers in the collection so may need something different than how we deal with eis_fire_perimeter. My proposal is to do something like the web-map-links extension:

{
    rel': 'featureserver',
   'href': 'https://services2.arcgis.com/FiaPA4ga0iQKduv3/arcgis/rest/services/IBTrACS_ALL_list_v04r00_lines_1/FeatureServer',
   'type': 'image/json',
   'title': 'ArcGIS FeatureServer',
   'featureserver:layers': {
        0: 'Hurricane_Tracks_A'
    }
}

[smohiudd]

PR created in web-map-links extension: stac-extensions/web-map-links#27