| output | ||
|---|---|---|
|
Throughout the Geoconnex docs you can find links to explanations of general best practices that motivate Geoconnex development as well as how these best practices are implemented and used in practice. Many of these best practices are inspired by the W3C Spatial Data on the Web Best Practices and the Second Environmental Linked Features Experiment (SELFIE).
| { | |
| "@iot.selfLink": "https://wqie.internetofwater.app/FROST-Server/v1.1/Datastreams('0442bf6d-35c8-5a40-33ce-ad664e905735')", | |
| "@iot.id": "0442bf6d-35c8-5a40-33ce-ad664e905735", | |
| "name": "pH at 21COL001_WQX-9830", | |
| "description": "pH at 21COL001_WQX-9830", | |
| "observationType": "http://www.opengis.net/def/observationType/OGC-OM/2.0/OM_Measurement", | |
| "unitOfMeasurement": { | |
| "name": "None", | |
| "symbol": "None", | |
| "definition": "None" |
| { | |
| "@context": { | |
| "@vocab": "https://schema.org/", | |
| "xsd": "https://www.w3.org/TR/xmlschema-2/#", | |
| "rdfs": "http://www.w3.org/2000/01/rdf-schema#", | |
| "dc": "http://purl.org/dc/terms/", | |
| "dcat": "https://www.w3.org/ns/dcat#", | |
| "freq": "http://purl.org/cld/freq/", | |
| "qudt": "http://qudt.org/schema/qudt/", | |
| "qudt-units": "http://qudt.org/vocab/unit/", |
| --- | |
| title: "Using the geoconnex Reference Feature Server with R" | |
| format: | |
| html: | |
| code-fold: show | |
| toc: true | |
| toc-location: left | |
| toc-depth: 4 | |
| toc-expand: 3 | |
| page-layout: full |
| PREFIX schema: <https://schema.org/> | |
| PREFIX gsp: <http://www.opengis.net/ont/geosparql#> | |
| PREFIX wiki: <https://www.wikidata.org/wiki/> | |
| PREFIX hyf: <https://www.opengis.net/def/schema/hy_features/hyf/> | |
| PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> | |
| SELECT ?dataset ?variableName ?temporalCoverage WHERE { | |
| # Bind the @id of the mainstem of interest | |
| BIND(<https://geoconnex.us/ref/mainstems/1009561> AS ?mainstem) | |
| { | |
| "type": "CoverageCollection", | |
| "domainType": "PointSeries", | |
| "parameters": { | |
| "discharge": { | |
| "type": "Parameter", | |
| "description": {"en":"Water discharge in cubic feet per second"}, | |
| "observedProperty": { | |
| "label": {"en":"Discharge"}, | |
| "id": "http://waterdata.usgs.gov/nwisweb/rdf?parmCd=00060" |
| <gml:FeatureCollection | |
| xmlns:gml="http://www.opengis.net/gml/3.2" | |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xmlns:wml2="http://www.opengis.net/waterml/2.0" | |
| xmlns:xlink="http://www.w3.org/1999/xlink" | |
| xmlns:om="http://www.opengis.net/om/2.0" | |
| xmlns:sa="http://www.opengis.net/sampling/2.0" | |
| xmlns:sams="http://www.opengis.net/samplingSpatial/2.0" | |
| xmlns:swe="http://www.opengis.net/swe/2.0" gml:id="USGS.waterservices" xsi:schemaLocation="http://www.opengis.net/waterml/2.0 http://schemas.opengis.net/waterml/2.0/waterml2.xsd"> | |
| <gml:featureMember> |
| library(sf) | |
| library(mapview) | |
| # read identifiers for Colorado River and Colorado River (TX) into simple features | |
| colorado_river <- sf::read_sf("https://geoconnex.us/ref/mainstems/29559") | |
| colorado_river_tx <- sf::read_sf("https://geoconnex.us/ref/mainstems/2639515") | |
| ## Function that constructs query to retrive the latest discharge observation from the USGS |