Add layer for FCC tower registrations

layers/fcc/towers/README.md

@@ -0,0 +1 @@
+https://data.fcc.gov/download/pub/uls/complete/r_tower.zip

layers/fcc/towers/layer.js

@@ -0,0 +1,24 @@
+import VectorLayer from 'ol/layer/Vector';
+import {Vector as VectorSource} from 'ol/source.js';
+import GeoJSON from 'ol/format/GeoJSON.js';
+
+import {Style} from 'ol/style.js';
+import Icon from 'ol/style/Icon.js';
+
+import data from './data.geojson?url'; // TODO: remove `?url`?
+import pinURL from './pin.svg?url'; // TODO: remove `?url`?
+
+const vectorLayer = new VectorLayer({
+    source: new VectorSource({
+        url: data,
+        format: new GeoJSON,
+    }),
+    style: new Style({
+        image: new Icon({
+            anchor: [0.5, 1],
+            src: pinURL,
+        }),
+    }),
+});
+
+export default vectorLayer;

layers/fcc/towers/pin.svg

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 384 512"
+   width="40px"
+   height="30px"
+   version="1.1"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <!--! Font Awesome Pro 6.0.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2022 Fonticons, Inc. -->
+  <path
+     d="m 384,192 c 0,87.4 -117,243 -168.3,307.2 -12.3,15.3 -35.1,15.3 -47.4,0 C 116.1,435 0,279.4 0,192 0,85.96 85.96,0 192,0 245.96029,0 294.73775,22.275796 329.62577,58.136607 363.27205,92.721042 384,139.94065 384,192 Z"
+     style="fill:#fd7800;fill-opacity:1" />
+</svg>

layers/fcc/towers/process.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i python3 -p python3
+
+import csv
+import io
+import json
+import zipfile
+
+fieldnames = {
+    "CO": ("Record Type", "Content Indicator", "File Number", "Registration Number", "Unique System Identifier",
+           "Coordinate Type", "Latitude Degrees", "Latitude Minutes", "Latitude Seconds", "Latitude Direction",
+           "Latitude_Total_Seconds", "Longitude Degrees", "Longitude Minutes", "Longitude Seconds",
+           "Longitude Direction", "Longitude Total Seconds", "Array Tower Position", "Array Total Tower"),
+
+}
+filenames = ["CO", "EN", "HS", "RA", "RE", "SC"]
+files = {}
+
+with zipfile.ZipFile("r_tower.zip", "r") as z:
+    for filename in filenames:
+        with z.open(f"{filename}.dat", "r") as f, io.TextIOWrapper( # Avoids `_csv.Error: iterator should return strings, not bytes (the file should be opened in text mode)`
+            f, encoding="utf-8", newline="", errors="replace"
+        ) as text_f:
+            contents = []
+            # csv expects text rows; TextIOWrapper decodes bytes from the zip member
+            reader = csv.DictReader(text_f, delimiter="|", fieldnames=fieldnames.get(filename))
+            for row in reader:
+                contents.append(row)
+            files[filename] = contents
+
+# CO data example:
+#{
+#   'Record Type': 'CO',
+#   'Content Indicator': 'REG',
+#   'File Number': 'A0016772',
+#   'Registration Number': '1014003',
+#   'Unique System Identifier': '99845',
+#   'Coordinate Type': 'T',
+#   'Latitude Degrees': '18',
+#   'Latitude Minutes': '26',
+#   'Latitude Seconds': '18.0',
+#   'Latitude Direction': 'N',
+#   'Latitude_Total_Seconds': '66378.0',
+#   'Longitude Degrees': '66',
+#   'Longitude Minutes': '29',
+#   'Longitude Seconds': '53.0',
+#   'Longitude Direction': 'W',
+#   'Longitude Total Seconds': '239393.0',
+#   'Array Tower Position': '',
+#   'Array Total Tower': ''
+# }
+
+towers = []
+
+for w in files["CO"]:
+    if w['Longitude Degrees'] == '' or w['Latitude Degrees'] == '':
+        print(f"Skipping tower with missing coordinates: {w}")
+        continue
+    towers.append({
+        "type": "Feature",
+        "geometry": {
+            "type": "Point",
+            "coordinates": [
+                (float(w['Longitude Degrees']) +
+                 float(w['Longitude Minutes']) / 60 +
+                 float(w['Longitude Seconds']) / 3600) *
+                (-1 if w['Longitude Direction'] == 'W' else 1),
+                (float(w['Latitude Degrees']) +
+                 float(w['Latitude Minutes']) / 60 +
+                 float(w['Latitude Seconds']) / 3600) *
+                (1 if w['Latitude Direction'] == 'N' else -1),
+            ], # yes, [lon, lat] since it's [x, y]
+        },
+        "properties": {
+            "File Number": w['File Number'],
+            "Registration Number": w['Registration Number'],
+            "Unique System Identifier": w['Unique System Identifier'],
+        },
+    })
+
+print(f"""{len(towers)} towers found""")
+
+geojson = {
+    "type": "FeatureCollection",
+    "features": towers,
+}
+
+with open("data.geojson", "w") as f:
+    f.write(json.dumps(geojson))

layers/index.js

@@ -23,6 +23,7 @@ import minnesotaAdventureTrails from './minnesota-adventure-trails/index.js';
 import cropHistory from './crop-history/index.js';
 import mnAmbulanceServiceAreas from './mn-ambulance-service-areas/layer.js';
 import upsServiceAreas from './ups/index.js';
+import fccTowersLayer from './fcc/towers/layer.js';
 
 const layerCategories = [
     { // Base maps
@@ -93,6 +94,10 @@ const layerCategories = [
                 layer: bikepackingLayer,
             },
             mnAmbulanceServiceAreas,
+            {
+                name: "FCC Towers",
+                layer: fccTowersLayer,
+            }
         ]
     },
     upsServiceAreas,