2f:null 30:["$","title",null,{"children":"2022 30-day Map Challenge • Day 27 • 🎶 Music • LIVE! Maine Radio Station Genres 🔊 | boB Rudis | Observable"}] 35:T5b1,Music 🎵 surrounds us in most populated areas of the 🇺🇸. That doesn't necessarily mean that music is _playing_ in the room/area you are in right now, but invisible radio waves are carrying tunes of diverse genres throughout your house/apartment/bungalow nearly 24/7. The FCC keeps track of where stations are transmitting 📡 from along with the shape of their broadcast signal range. Other sites maintain sufficient metadata to join all these elements together, enabling us to make a "music map". _(Links to all sites are in the R code at the end of this notebook.)_ The visualization, below, shows the transmission contours of individual radio stations in Maine that primarily play music of a single genre. I've cleaned up (simplified) the genres to make for a better color scale choice. Select individual genres to see what's being played in any given area. Note, once more, how isolated the northwest portions of Maine truly are. The player _works_! It took forever to find Maine stations that have AAC or MP3 streams, and the **URLs may break at any time**, _or take a few seconds to buffer_. This notebook introduces some new D3 items: - gradient fills - path shape transitions (courtesy of [flubber](https://observablehq.com/@mbostock/hello-flubber)) To see a view with all U.S. stations/towers (minus the precise outlines) head on over [to this sibling notebook](https://observablehq.com/@hrbrmstr/u-s-radio-station-coverage-areas).36:T113b,music_map = { const svg = d3 .create("svg") .attr("viewBox", [0, 0, width, height]) .style("width", width) .style("height", height); // define the radial gradients for the station path fills const stationGradients = svg .append("defs") .selectAll("radialGradient") .data(genres.map((d) => d.simple_genre.replace(" ", "-"))) .enter() .append("radialGradient") .attr("gradientUnits", "objectBoundingBox") .attr("cx", 0) .attr("cy", 0) .attr("r", "100%") .attr("id", (d) => d); stationGradients .append("stop") .attr("offset", "0%") .style("stop-color", "white"); stationGradients .append("stop") .attr("offset", "100%") .style("stop-color", (d) => scaleColorFill(d)); // top-to-bottom linear gradient for the panel backgrouns const bgGradient = svg .append("defs") .append("linearGradient") .attr("id", "back") .attr("x1", "0%") .attr("x2", "0%") .attr("y1", "0%") .attr("y2", "100%"); bgGradient .append("stop") .attr("offset", "0%") .style("stop-color", "#386cb0") .style("stop-opacity", 1); bgGradient .append("stop") .attr("offset", "100%") .style("stop-color", "white") .style("stop-opacity", 1); const panel = svg.append("g"); panel .append("rect") .attr("x", 0) .attr("y", 0) .attr("height", height) .attr("width", width) .attr("fill", "url(#back)"); const counties = svg.append("g"); counties .selectAll("counties") .data(meCounties.features) .enter() .append("path") .attr("d", path) .style("stroke", "white") .style("stroke-width", "1px") .style("stroke-linejoin", "rounded") .style("fill", "#bf5b17") .style("fill-opacity", "0.25"); const outline = svg.append("g"); outline .selectAll("border") .data(meBorder.features) .enter() .append("path") .attr("class", "state-border") .attr("d", path) .attr("stroke", "black") .attr("stroke-width", "2") .attr("fill-opacity", "0"); const stations = svg.append("g"); // this bit looks gnarly, but // // - the filter() is so we can focus on one or all genres // - we pass in an array of feature indices as data elements vs the features themselves a // which we'll used to identify the right feature // - for the initial state of each station/transmitter, we calculate the centroid and // initially draw a circle // - we then draw the base circle // - once drawn we transition the circle to the proper station service contour outlines (the `attrTween`) stations .selectAll("path") .data( d3.range( meStations.features.filter((d) => selected_genre == "All" ? true : d.properties.simple_genre == selected_genre ).length ) ) .enter() .append("path") .attr("d", (d) => { const geo = path( meStations.features.filter((d) => selected_genre == "All" ? true : d.properties.simple_genre == selected_genre )[d] ); const centroid = path.centroid(meStations.features[d]); const circle = pathCircle(centroid[0], centroid[1], 10); return circle; }) .style("stroke-width", "1.5px") .style("stroke", "black") .style("stroke-opacity", "1") .style("stroke-dasharray", "1,2") .attr( "fill", (d) => `url(#${meStations.features .filter((d) => selected_genre == "All" ? true : d.properties.simple_genre == selected_genre ) [d].properties.simple_genre.replace(" ", "-")})` ) .style("fill-opacity", selected_genre == "All" ? "0.5" : "0.9") .transition() .duration(750) .ease(d3.easeLinear) .attrTween("d", function (d) { const geo = path( meStations.features.filter((d) => selected_genre == "All" ? true : d.properties.simple_genre == selected_genre )[d] ); const centroid = path.centroid( meStations.features.filter((d) => selected_genre == "All" ? true : d.properties.simple_genre == selected_genre )[d] ); const circle = pathCircle(centroid[0], centroid[1], 30); return flubber.interpolate(circle, geo); }); return svg.node(); }37:T4cd,sample_stations = { var ret = { Country: "https://14553.live.streamtheworld.com/WTHT_FMAAC.aac?pname=StandardPlayerV4&pversion=4.19.2-044&csegid=888&dist=triton-web&tdsdk=js-2.9&swm=false&banners=300x250&burst-time=15&sbmid=94833a10-03ca-4048-d04b-6149598e1262", Contemporary: "https://26283.live.streamtheworld.com/WFMXFMAAC.aac?pname=StandardPlayerV4&pversion=4.19.2-044&csegid=888&dist=triton-web&tdsdk=js-2.9&swm=false&banners=300x250&burst-time=15&sbmid=9d2aaf2b-d015-488f-add9-9647a5625029", Religious: "https://ic1.sslstream.com/wsew-fm?rnd=3410", Rock: "https://24493.live.streamtheworld.com/WHXR_FMAAC_SC?dist=onlineradiobox", Alternative: "https://ice8.securenetsystems.net/WZLO?playSessionID=E9E8908B-155D-C0F3-0362DAC67EEA487B", Classical: "http://27053.live.streamtheworld.com:3690/WMEAFM.mp3" }; ret["Top-40"] = "https://ia600605.us.archive.org/8/items/NeverGonnaGiveYouUp/jocofullinterview41.mp3"; ret["Classic Hits"] = "https://24503.live.streamtheworld.com/WFMXFMAAC.aac?pname=StandardPlayerV4&pversion=4.19.2-044&csegid=888&dist=triton-web&tdsdk=js-2.9&swm=false&banners=300x250&burst-time=15&sbmid=a4b7c89f-f529-4bbf-cdc9-7825edabf57c"; return ret; }38:Taed,```r library(sf) library(xml2) library(rvest) library(tidyverse) # I just used an interactive Burp Proxy session to grab the HTML tables read_xml("~/Data/scraped.burp") |> # https://radio-locator.com/cgi-bin/ xml_find_all(".//item[contains(method, 'GET')]/response") |> xml_text() |> map(openssl::base64_decode) |> map(rawToChar) |> map(read_html) |> map(html_node, xpath = ".//table[@style = 'width:100%;border-spacing:2px']") |> keep(~ length(.x) > 0) |> map_df(~{ tibble( call_sign = tail(html_nodes(.x, xpath = ".//td[3]") |> html_text(), -1), frequency = tail(html_nodes(.x, xpath = ".//td[4]") |> html_text(), -1), city = tail(html_nodes(.x, xpath = ".//td[5]") |> html_text(), -1), genre = html_nodes(.x, xpath = ".//td[7]/span[1]") |> html_text() ) }) |> distinct() |> mutate( call_sign = gsub(" \\(.*", "", call_sign) ) |> distinct( call_sign, .keep_all = TRUE ) -> stations read_delim( file = "~/Data/stations.txt", # https://transition.fcc.gov/fcc-bin/fmq?call=&fileno=&state=ME&city=&freq=0.0&fre2=107.9&serv=-1&status=&facid=&asrn=&class=&list=4&ThisTab=Results+to+This+Page/Tab&dist=&dlat2=&mlat2=&slat2=&NS=N&dlon2=&mlon2=&slon2=&EW=W&size=9 col_names = FALSE, delim = "|", trim_ws = TRUE ) |> select( call_sign = X2, id = X39 ) |> filter(!is.na(id)) -> call_sign_to_id # Someone *REALLY* needs to introduce the FCC to shapefiles or GeoJSON read_delim( file = "~/Data/FM_service_contour_current.txt", # https://www.fcc.gov/media/radio/fm-service-contour-data-points delim = "|", trim_ws = TRUE ) |> select( id = lms_application_id, matches("[[:digit:]]") ) |> filter( id %in% call_sign_to_id$id ) |> pivot_longer( -id, names_to = "crd", values_to = "coord" ) |> separate( coord, into = c("lat", "lng"), sep = "[ ,]+" ) |> filter(!is.na(lat) | !is.na(lng)) |> st_as_sf( coords = c("lng", "lat"), crs = 4326 ) |> group_by(id) |> summarise( geometry = st_combine(geometry) ) |> st_cast("POLYGON") |> left_join( call_sign_to_id ) |> left_join(stations) |> select( call_sign, frequency, city, genre, id ) |> filter( !is.na(genre), !(genre %in% c('Talk', 'College', 'Variety', 'Grade School (K-12)', 'Nostalgia', 'Sports', 'Public Radio')) ) |> mutate( # simplify the genres simple_genre = case_when( genre %in% c("Adult Contemporary", "Hot AC") ~ "Contemporary", grepl("Christian|Relig|Gospel", genre) ~ "Religious", grepl("Country", genre) ~ "Country", grepl("Rock", genre) ~ "Rock", grepl("Alternative", genre) ~ "Alternative", TRUE ~ genre ) ) |> st_write("~/Data/me-stations.geojson") ```39:[{"id":"86cce272bf45021cea48e0246303eb62b70e6aa38e009bde22a905a85bbd779ffd4b53f94580023a098d9e121d2864029bf6786ec336c671720b4f8dd48b5182","href":"https://static.observableusercontent.com/files/86cce272bf45021cea48e0246303eb62b70e6aa38e009bde22a905a85bbd779ffd4b53f94580023a098d9e121d2864029bf6786ec336c671720b4f8dd48b5182","name":"me-counties.geojson","type":"application/geo+json","lastModified":1669400056786.867,"size":36847},{"id":"2ea994a6c2bbf7278246e2bcae725cb253ba08187c760e368496387bf33d0178103f79fb9a113cdc43dfc88ae641fbf0c7008097b65d26fcac240272be00edc2","href":"https://static.observableusercontent.com/files/2ea994a6c2bbf7278246e2bcae725cb253ba08187c760e368496387bf33d0178103f79fb9a113cdc43dfc88ae641fbf0c7008097b65d26fcac240272be00edc2","name":"me-stations@4.geojson","type":"application/geo+json","lastModified":1669402907107.287,"size":764734},{"id":"766f9185c2e2420444e1fdc3592f42437b38775a6e6ef9cf40d9a82dc2bcf701df7e536ac9d9000b2d6837ba55c811b1edf8d8e6354f0a8ccf8f5021cbf7242d","href":"https://static.observableusercontent.com/files/766f9185c2e2420444e1fdc3592f42437b38775a6e6ef9cf40d9a82dc2bcf701df7e536ac9d9000b2d6837ba55c811b1edf8d8e6354f0a8ccf8f5021cbf7242d","name":"me-border.geojson","type":"application/geo+json","lastModified":1669414400407.556,"size":13974}] 33:{"id":"460650073f860a99","slug":"2022-30-day-map-challenge-day-27-music-maine-radio-station-ge","title":"2022 30-day Map Challenge • Day 27 • 🎶 Music • LIVE! 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