Investigate crosswalk for JSON-LD

[webb-ben]

The java implementation of the NLDI provides rich text results for individually identifier crawled features:

i.e. for wqp/WIDNR_WQX-133553/json

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [-89.541614, 43.125092]
      },
      "properties": {
        "identifier": "WIDNR_WQX-133553",
        "navigation": "https://labs.waterdata.usgs.gov/api/nldi/linked-data/wqp/WIDNR_WQX-133553/navigation",
        "name": "Pheasant Branch at Schneider Rd",
        "source": "WQP",
        "sourceName": "Water Quality Portal",
        "comid": "13293676",
        "type": "varies",
        "uri": "https://www.waterqualitydata.us/provider/STORET/WIDNR_WQX/WIDNR_WQX-133553/",
        "mainstem": "https://geoconnex.us/ref/mainstems/575519"
      }
    }
  ]
}

there is wqp/WIDNR_WQX-133553/json+ld

{
  "@context": [
    {
      "schema": "https://schema.org/",
      "geo": "schema:geo",
      "hyf": "https://www.opengis.net/def/schema/hy_features/hyf/",
      "gsp": "http://www.opengis.net/ont/geosparql#",
      "name": "schema:name",
      "comid": {
        "@id": "schema:geoWithin",
        "@type": "@id"
      },
      "hyf:linearElement": {
        "@type": "@id"
      }
    }
  ],
  "@id": "https://www.waterqualitydata.us/provider/STORET/WIDNR_WQX/WIDNR_WQX-133553/",
  "@type": "https://www.opengis.net/def/schema/hy_features/hyf/HY_HydroLocation",
  "schema:subjectOf": {
    "@type": "schema:CreativeWork",
    "schema:identifier": "WQP",
    "schema:name": "Water Quality Portal"
  },
  "name": "Pheasant Branch at Schneider Rd",
  "comid": "https://geoconnex.us/nhdplusv2/comid/13293676",
  "hyf:referencedPosition": [
    {
      "hyf:HY_IndirectPosition": {
        "hyf:linearElement": "https://geoconnex.us/ref/mainstems/575519"
      }
    }
  ],
  "geo": {
    "@type": "schema:GeoCoordinates",
    "schema:longitude": -89.541614,
    "schema:latitude": 43.125092
  },
  "gsp:hasGeometry": {
    "@type": "http://www.opengis.net/ont/sf#Point",
    "gsp:asWKT": {
      "@value": "POINT(-89.541614 43.125092)",
      "@type": "http://www.opengis.net/ont/geosparql#wktLiteral"
    }
  }
}

with the python implementation, these pages can alternatively be represented via pygeoapi (and thus an HTML, JSON, and JSON-LD representation):
https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features/items/WIDNR_WQX-133553

with this JSON-LD out of the box (note this could be templated easily through pygeoapi)

{
  "@context": [
    {
      "schema": "https://schema.org/",
      "type": "@type",
      "gsp": "http://www.opengis.net/ont/geosparql#"
    }
  ],
  "type": "schema:Place",
  "id": "WIDNR_WQX-133553",
  "prev": "WIDNR_WQX-133552",
  "next": "WIDNR_WQX-134002",
  "uri": "http://www.waterqualitydata.us/provider/STORET/WIDNR_WQX/WIDNR_WQX-133553/",
  "crawler_source_id": 1,
  "comid": 13293676,
  "measure": null,
  "name": "Pheasant Branch at Schneider Rd",
  "reachcode": null,
  "shape": null,
  "geometry": {
    "type": "Point",
    "coordinates": [-89.541614, 43.125092]
  },
  "gsp:hasGeometry": {
    "@type": "http://www.opengis.net/ont/sf#Point",
    "gsp:asWKT": {
      "@type": "http://www.opengis.net/ont/geosparql#wktLiteral",
      "@value": "POINT (-89.541614 43.125092)"
    }
  },
  "schema:geo": {
    "@type": "schema:GeoCoordinates",
    "schema:longitude": -89.541614,
    "schema:latitude": 43.125092
  },
  "@id": "https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features/items/WIDNR_WQX-133553",
  "links": [
    {
      "type": "application/json",
      "rel": "root",
      "title": "The landing page of this server as JSON",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi?f=json"
    },
    {
      "type": "text/html",
      "rel": "root",
      "title": "The landing page of this server as HTML",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi?f=html"
    },
    {
      "rel": "alternate",
      "type": "application/geo+json",
      "title": "This document as GeoJSON",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features/items/WIDNR_WQX-133553?f=json"
    },
    {
      "rel": "self",
      "type": "application/ld+json",
      "title": "This document as RDF (JSON-LD)",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features/items/WIDNR_WQX-133553?f=jsonld"
    },
    {
      "rel": "alternate",
      "type": "text/html",
      "title": "This document as HTML",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features/items/WIDNR_WQX-133553?f=html"
    },
    {
      "rel": "collection",
      "type": "application/json",
      "title": "Features",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features"
    },
    {
      "rel": "prev",
      "type": "application/ld+json",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features/items/WIDNR_WQX-133552?f=jsonld"
    },
    {
      "rel": "next",
      "type": "application/ld+json",
      "href": "https://nldi.internetofwater.app/api/nldi/pygeoapi/collections/nldi/features/items/WIDNR_WQX-134002?f=jsonld"
    }
  ]
}

cc: @dblodgett-usgs @ksonda