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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>County Map</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-H13EFXBPKL"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag() { dataLayer.push(arguments); }
gtag('js', new Date());
gtag('config', 'G-H13EFXBPKL');
</script>
<!-- Google Tag Manager -->
<script>(function (w, d, s, l, i) {
w[l] = w[l] || []; w[l].push({
'gtm.start':
new Date().getTime(), event: 'gtm.js'
}); var f = d.getElementsByTagName(s)[0],
j = d.createElement(s), dl = l != 'dataLayer' ? '&l=' + l : ''; j.async = true; j.src =
'https://www.googletagmanager.com/gtm.js?id=' + i + dl; f.parentNode.insertBefore(j, f);
})(window, document, 'script', 'dataLayer', 'GTM-WJ5WD2NX');</script>
<!-- End Google Tag Manager -->
<!-- Tailwind CSS -->
<script src="https://cdn.tailwindcss.com"></script>
<!-- Mapbox GL JS -->
<script src="https://api.mapbox.com/mapbox-gl-js/v2.15.0/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v2.15.0/mapbox-gl.css" rel="stylesheet" />
<!-- Material UI icons -->
<link href="https://fonts.googleapis.com/icon?family=Material+Icons+Outlined" rel="stylesheet">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<!-- Roboto font -->
<link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;600;700&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Roboto+Condensed:wght@700&display=swap" rel="stylesheet">
<style>
.material-icons-outlined {
font-size: 1.25rem;
width: 1.25rem;
height: 1.25rem;
}
html {
scroll-behavior: smooth;
}
body {
font-display: swap;
margin: 0;
font-family: 'Roboto', sans-serif;
}
#map {
width: 100%;
height: 100%;
}
.mapboxgl-popup {
max-width: 250px;
font-family: 'Roboto', sans-serif;
font-size: 0.875rem;
}
.mapboxgl-popup-content {
background: white;
border-radius: 0.5rem;
box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
padding: 1rem;
color: #1f2937;
}
.mapboxgl-popup-close-button {
display: none; /* Hide close button */
}
.popup-header {
font-family: 'Roboto Condensed', sans-serif;
font-weight: 700;
margin-bottom: 0.5rem;
}
/* Remove indentation from dropdown options */
#layer-select option,
#layer-select optgroup {
padding-left: 0;
margin-left: 0;
}
#layer-select optgroup option {
padding-left: 0;
}
</style>
</head>
<body class="overflow-hidden">
<div class="flex h-screen w-screen">
<!-- Sidebar -->
<div id="sidebar" class="w-80 bg-white border-r border-gray-300 shadow-xl p-4 overflow-y-auto z-10">
<div class="flex flex-col h-full">
<h2 id="map-title" class="text-xl font-semibold mb-5"></h2>
<div class="overflow-y-auto flex-grow">
<!-- Data layer selector -->
<div class="mb-4 -ml-3 relative">
<div class="absolute left-3 top-1/2 transform -translate-y-1/2 pointer-events-none">
<svg class="w-4 h-4 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7" />
</svg>
</div>
<select id="layer-select" class="w-full bg-white rounded pl-9 pr-8 py-2 text-sm focus:outline-none appearance-none border-0" style="box-shadow: none;">
<option value="" selected>Select data layer</option>
<option value="blank" hidden></option>
<optgroup label="Census Tract Data">
<option value="tract:pctrent30_23">Percent of renters cost burdened (2023)</option>
<option value="tract:pctowned30_23">Percent of homeowners cost burdened (2023)</option>
<option value="tract:total_cb_rt_23">Total cost burden rate (2023)</option>
<option value="tract:hh_change_23_20">Household change 2020-2023 (%)</option>
<option value="tract:median_hh_income_23">Median household income (2023)</option>
<option value="tract:commute_gt45mins_sh_23">Share of population commuting 45+ minutes (2023)</option>
<!-- <option value="tract:pop_23">Population (2023)</option> -->
<!-- <option value="tract:housing_unit_count_23">Housing unit count (2023)</option> -->
<!-- <option value="tract:total_hh_23">Total households (2023)</option> -->
</optgroup>
<optgroup label="Zip Code Data (Zillow)">
<option value="zip:zhvi_20">Typical home value 2020 (ZHVI)</option>
<option value="zip:zhvi_25">Typical home value 2025 (ZHVI)</option>
<option value="zip:zhvi_change_20_25">Home value change 2020-2025 (%)</option>
</optgroup>
</select>
</div>
<!-- Legend container -->
<div id="legend" class="mt-4 pb-4 hidden">
<h3 id="legend-title" class="font-medium mb-2 text-black"></h3>
<div id="legend-content" class="space-y-1 text-sm text-black mb-2">
</div>
<button id="layer-info" class="flex items-center text-sm text-black hover:text-gray-700 mt-4">
<span class="material-icons text-base mr-1">info</span>
About this layer
</button>
<div id="layer-description" class="mt-1 text-xs text-black leading-snug hidden">
</div>
</div>
</div>
<!-- Overlays section -->
<div id="overlay-wrapper" class="border-t border-gray-300 w-full mt-auto pt-3 pb-3">
<button
id="overlay-toggle"
class="w-full pl-0 pr-2 py-2 flex items-center justify-between bg-white hover:bg-gray-100 text-sm font-medium rounded"
>
<span class="flex items-center gap-1">
<span class="material-icons align-text-bottom">layers</span>
Overlays
</span>
<svg id="overlay-arrow" class="w-4 h-4 transform transition-transform" xmlns="http://www.w3.org/2000/svg" fill="none"
viewBox="0 0 24 24" stroke="currentColor">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" />
</svg>
</button>
</div>
<!-- Basemap toggle section -->
<div id="basemap-wrapper" class="border-t border-gray-300 w-full pt-3">
<button
id="basemap-toggle"
class="w-full pl-0 pr-2 py-2 flex items-center justify-between bg-white hover:bg-gray-100 text-sm font-medium rounded"
>
<span class="flex items-center gap-1">
<span class="material-icons align-text-bottom">map</span>
Basemap
</span>
<svg id="basemap-arrow" class="w-4 h-4 transform transition-transform" xmlns="http://www.w3.org/2000/svg" fill="none"
viewBox="0 0 24 24" stroke="currentColor">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7" />
</svg>
</button>
<!-- Basemap options -->
<div id="basemap-settings" class="hidden mt-2 space-y-3 text-sm text-black">
<div id="basemap-style-thumbnails" class="flex gap-2" style="font-family: 'Roboto', sans-serif;">
<button data-style="gray" class="flex-1 border border-white rounded p-1 hover:border-gray-400">
<div class="aspect-video bg-gray-100 rounded text-xs flex items-center justify-center">Gray</div>
</button>
<button data-style="satellite" class="flex-1 border border-white rounded p-1 hover:border-gray-400">
<div class="aspect-video bg-gray-100 rounded text-xs flex items-center justify-center">Aerial</div>
</button>
<button data-style="lightSatellite" class="flex-1 border border-white rounded p-1 hover:border-gray-400">
<div class="aspect-video bg-gray-100 rounded text-xs flex flex-col items-center justify-center leading-tight">
<span>Light</span>
<span>Aerial</span>
</div>
</button>
</div>
</div>
</div>
<!-- Community Scale Logo -->
<div class="border-t border-gray-300 w-full pt-3 mt-3">
<a href="https://communityscale.io" target="_blank" rel="noopener noreferrer" class="flex items-center gap-2 hover:opacity-75 transition-opacity">
<div class="bg-black rounded p-1.5 shadow-sm">
<img src="https://communityscale.io/wp-content/uploads/2024/01/white-on-black-with-edges-150x150.png"
alt="CommunityScale logo"
class="h-6 w-6">
</div>
<span class="font-bold text-black" style="font-family: 'Roboto Condensed', sans-serif;">CommunityScale</span>
</a>
</div>
</div>
</div>
<!-- Overlay Sidebar (slides out from right of main sidebar) -->
<div id="overlay-sidebar" class="w-64 bg-white shadow-xl p-4 overflow-y-auto z-10 transition-all duration-300" style="height: 100vh; position: fixed; left: -256px;">
<h3 class="text-lg font-semibold mb-4">Overlays</h3>
<!-- Boundaries Section -->
<div class="text-xs font-semibold text-gray-600 uppercase tracking-wide mt-2 mb-2">Boundaries</div>
<label class="flex items-center gap-2 text-sm text-gray-700 mb-2">
<div class="relative">
<input type="checkbox" class="sr-only overlay-toggle peer" value="subregions-outline" />
<div class="w-6 h-3.5 bg-gray-300 rounded-full peer-checked:bg-gray-600 transition-colors"></div>
<div class="absolute top-[2px] left-[2px] w-2.5 h-2.5 bg-white border border-gray-400 rounded-full transition-transform peer-checked:translate-x-[10px]"></div>
</div>
<span>Subregions</span>
</label>
</div>
<!-- Map container -->
<div id="map" class="flex-grow relative">
<!-- Map controls -->
<div class="absolute top-4 right-4 flex flex-col gap-2 z-10">
<button id="zoom-in" class="bg-white hover:bg-gray-100 rounded shadow-lg w-10 h-10 flex items-center justify-center text-gray-700 font-bold text-xl border border-gray-300">
+
</button>
<button id="zoom-out" class="bg-white hover:bg-gray-100 rounded shadow-lg w-10 h-10 flex items-center justify-center text-gray-700 font-bold text-xl border border-gray-300">
−
</button>
<button id="reset-extent" class="bg-white hover:bg-gray-100 rounded shadow-lg w-10 h-10 flex items-center justify-center border border-gray-300" title="Reset to county extent">
<span class="material-icons text-black">refresh</span>
</button>
</div>
</div>
</div>
<script>
// ============================================
// CONFIGURATION - Edit these values
// ============================================
// County of interest - change this to analyze a different county
const COUNTY_NAME = 'Will County';
const COUNTY_GEOID = '17197'; // Will County GEOID (State FIPS 17 + County FIPS 197)
const STATE_NAME = 'Illinois';
// Optional: Custom initial map view (leave null to auto-fit to county)
// If set, these will override the automatic zoom-to-county behavior
const CUSTOM_CENTER = null; // Example: [-122.3321, 47.6062] for Seattle
const CUSTOM_ZOOM = null; // Example: 10 for city-level view
// Mapbox access token
mapboxgl.accessToken = 'pk.eyJ1IjoiY29tbXVuaXR5c2NhbGUiLCJhIjoiY21hZ3Y4azlmMDU5YTJqb2NqbzRsa3psbSJ9.eJlBVHcMSB88Czl3ti2i5g';
// Basemap styles
const BASEMAP_STYLES = {
gray: 'mapbox://styles/communityscale/cmcuwuwcv00xz01s1gn7xccqi',
satellite: 'mapbox://styles/communityscale/cmgidsjne002c01qne3nf930s',
lightSatellite: 'mapbox://styles/communityscale/cmgidu19b00n301sb0jcihsuk'
};
// Tileset IDs
const TILESETS = {
counties: 'communityscale.counties',
tracts: 'communityscale.tracts-2020',
zipcodes: 'communityscale.zipcodes',
muni: 'communityscale.place'
};
// Color palette (darkest to lightest, darkest = highest values)
const COLOR_PALETTE = ['#192f5e', '#3445b0', '#6e79dd', '#8795eb', '#adbfff', '#c2d8ff'];
// Layer source information
const LAYER_INFO = {
'tract:pctrent30_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)',
description: 'Percentage of renter-occupied households that are spending 30% or more of their monthly income on housing costs.'
},
'tract:pctowned30_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)',
description: 'Percentage of owner-occupied households that are spending 30% or more of their monthly income on housing costs.'
},
'tract:total_cb_rt_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)',
description: 'Percentage of all households (renters and owners) that are spending 30% or more of their monthly income on housing costs.'
},
'tract:hh_change_23_20': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates'
},
'tract:median_hh_income_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)'
},
'tract:pop_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)'
},
'tract:housing_unit_count_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)'
},
'tract:total_hh_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)'
},
'tract:commute_gt45mins_sh_23': {
source: 'U.S. Census Bureau, American Community Survey 5-Year Estimates (2019-2023)'
},
'zip:zhvi_20': {
source: 'Zillow Home Value Index (ZHVI)',
description: 'Typical home value in 2020. ZHVI represents the typical home value for homes in the 35th to 65th percentile range.'
},
'zip:zhvi_25': {
source: 'Zillow Home Value Index (ZHVI)',
description: 'Typical home value in 2025. ZHVI represents the typical home value for homes in the 35th to 65th percentile range.'
},
'zip:zhvi_change_20_25': {
source: 'Zillow Home Value Index (ZHVI)',
description: 'Percent change in typical home values between 2020 and 2025.'
}
};
// Data storage
let tractData = null;
let zipData = null;
let currentDataLayer = null;
let currentLayerName = null; // Store the layer name separately
// Initial map settings (will be updated to fit county)
let currentBasemap = 'gray';
// Store initial county bounds for reset button
let initialCountyBounds = null;
// ============================================
// MAP INITIALIZATION
// ============================================
// State center lookup for initial positioning
const stateCenters = {
'01': [-86.8, 32.8], // Alabama
'02': [-152.0, 64.0], // Alaska
'04': [-111.7, 34.3], // Arizona
'05': [-92.4, 34.9], // Arkansas
'06': [-119.7, 37.2], // California
'08': [-105.5, 39.0], // Colorado
'09': [-72.7, 41.6], // Connecticut
'10': [-75.5, 38.9], // Delaware
'11': [-77.0, 38.9], // District of Columbia
'12': [-81.5, 28.5], // Florida
'13': [-83.4, 32.6], // Georgia
'15': [-157.5, 20.6], // Hawaii
'16': [-114.6, 44.4], // Idaho
'17': [-89.4, 40.1], // Illinois
'18': [-86.3, 40.0], // Indiana
'19': [-93.5, 42.0], // Iowa
'20': [-98.4, 38.5], // Kansas
'21': [-85.3, 37.5], // Kentucky
'22': [-91.8, 30.9], // Louisiana
'23': [-69.2, 45.4], // Maine
'24': [-76.8, 39.0], // Maryland
'25': [-71.8, 42.3], // Massachusetts
'26': [-85.0, 44.3], // Michigan
'27': [-94.3, 46.4], // Minnesota
'28': [-89.7, 32.7], // Mississippi
'29': [-92.5, 38.4], // Missouri
'30': [-110.0, 47.0], // Montana
'31': [-99.8, 41.5], // Nebraska
'32': [-116.6, 39.3], // Nevada
'33': [-71.6, 43.7], // New Hampshire
'34': [-74.6, 40.2], // New Jersey
'35': [-106.1, 34.4], // New Mexico
'36': [-75.5, 43.0], // New York
'37': [-79.5, 35.6], // North Carolina
'38': [-100.5, 47.4], // North Dakota
'39': [-82.7, 40.2], // Ohio
'40': [-97.5, 35.6], // Oklahoma
'41': [-120.6, 43.9], // Oregon
'42': [-77.7, 40.9], // Pennsylvania
'44': [-71.5, 41.7], // Rhode Island
'45': [-80.9, 33.9], // South Carolina
'46': [-100.2, 44.4], // South Dakota
'47': [-86.4, 35.9], // Tennessee
'48': [-99.3, 31.5], // Texas
'49': [-111.7, 39.4], // Utah
'50': [-72.7, 44.0], // Vermont
'51': [-78.8, 37.5], // Virginia
'53': [-120.7, 47.4], // Washington
'54': [-80.6, 38.6], // West Virginia
'55': [-89.7, 44.6], // Wisconsin
'56': [-107.6, 43.0], // Wyoming
'72': [-66.4, 18.2] // Puerto Rico
};
// Use custom center/zoom if provided, otherwise use state center at state-level zoom
const stateFIPS = COUNTY_GEOID.substring(0, 2);
const stateCenter = stateCenters[stateFIPS] || [-98, 39];
const initialCenter = CUSTOM_CENTER || stateCenter;
const initialZoom = CUSTOM_ZOOM || 7; // State-level zoom instead of national
const map = new mapboxgl.Map({
container: 'map',
style: BASEMAP_STYLES[currentBasemap],
center: initialCenter,
zoom: initialZoom,
maxZoom: 22
});
// Update page title and sidebar heading with county name
document.title = COUNTY_NAME + ', ' + STATE_NAME + ' - Map';
document.getElementById('map-title').textContent = COUNTY_NAME + ', ' + STATE_NAME;
// Add error logging
map.on('error', function(e) {
console.error('Map error:', e);
});
map.on('styleimagemissing', function(e) {
console.warn('Style image missing:', e);
});
// ============================================
// MAP LOAD EVENT
// ============================================
map.on('load', function() {
// Add county boundaries source and layer
map.addSource('counties-source', {
type: 'vector',
url: 'mapbox://' + TILESETS.counties
});
// Find the first symbol layer (labels) to insert layers before it
const layers = map.getStyle().layers;
let firstSymbolId;
for (const layer of layers) {
if (layer.type === 'symbol') {
firstSymbolId = layer.id;
break;
}
}
// Add county layer with correct source-layer name: "states"
map.addLayer({
id: 'counties-fill',
type: 'fill',
source: 'counties-source',
'source-layer': 'states',
paint: {
'fill-color': 'transparent',
'fill-opacity': 0
}
}, firstSymbolId);
map.addLayer({
id: 'counties-outline',
type: 'line',
source: 'counties-source',
'source-layer': 'states',
paint: {
'line-color': '#1f2937',
'line-width': 2.5
},
filter: ['==', ['get', 'GEOID'], COUNTY_GEOID]
}, firstSymbolId);
// Add census tracts source and layer
map.addSource('tracts-source', {
type: 'vector',
url: 'mapbox://' + TILESETS.tracts
});
map.addLayer({
id: 'tracts-outline',
type: 'line',
source: 'tracts-source',
'source-layer': 'tracts',
paint: {
'line-color': '#6b7280',
'line-width': 0.5,
'line-opacity': 0.6
},
layout: {
'visibility': 'none' // Hidden by default
},
filter: [
'all',
['has', 'GEOID'],
['==', ['slice', ['get', 'GEOID'], 0, 2], stateFIPS]
]
}, firstSymbolId);
// Add zip codes source and layer
map.addSource('zipcodes-source', {
type: 'vector',
url: 'mapbox://' + TILESETS.zipcodes
});
// Fetch zip tileset metadata to find correct source-layer name
fetch('https://api.mapbox.com/v4/' + TILESETS.zipcodes + '.json?secure&access_token=' + mapboxgl.accessToken)
.then(response => response.json())
.then(data => {
if (data.vector_layers) {
const sourceLayer = data.vector_layers[0].id;
console.log('Using zip source-layer:', sourceLayer);
// Find the first symbol layer (labels) to insert before it
const layers = map.getStyle().layers;
let firstSymbolId;
for (const layer of layers) {
if (layer.type === 'symbol') {
firstSymbolId = layer.id;
break;
}
}
map.addLayer({
id: 'zipcodes-outline',
type: 'line',
source: 'zipcodes-source',
'source-layer': sourceLayer,
paint: {
'line-color': '#6b7280',
'line-width': 0.5,
'line-opacity': 0.6
},
layout: {
'visibility': 'none' // Hidden by default
},
filter: [
'all',
['has', 'GEOID20'],
[
'any',
['==', ['slice', ['to-string', ['get', 'GEOID20']], 0, 2], '60'],
['==', ['slice', ['to-string', ['get', 'GEOID20']], 0, 2], '61'],
['==', ['slice', ['to-string', ['get', 'GEOID20']], 0, 2], '62']
]
]
}, firstSymbolId);
}
})
.catch(error => console.error('Error fetching zip tileset metadata:', error));
// Add subregions overlay source
map.addSource('subregions-source', {
type: 'geojson',
data: 'subregions.geojson'
});
// Add subregions overlay layer (heavy black outline)
map.addLayer({
id: 'subregions-outline',
type: 'line',
source: 'subregions-source',
paint: {
'line-color': '#000000',
'line-width': 5
},
layout: {
visibility: 'none'
}
}, firstSymbolId);
console.log('Added subregions overlay layer');
// Load tract data from JSON
fetch('USA_CTs_251222.json')
.then(response => {
console.log('Fetch response status:', response.status);
if (!response.ok) {
throw new Error('Failed to load CTs_USA_251222: ' + response.status);
}
return response.json();
})
.then(data => {
console.log('Total USA tract records:', data.length);
console.log('Sample record:', data[0]);
// Filter to only include tracts from the specified state
// Extract state FIPS from COUNTY_GEOID (first 2 digits)
const stateFIPS = COUNTY_GEOID.substring(0, 2);
console.log('Filtering for state FIPS:', stateFIPS);
tractData = data.filter(d => d.geoid && d.geoid.startsWith(stateFIPS));
console.log('Loaded', tractData.length, 'tract records for', STATE_NAME);
if (tractData.length === 0) {
console.warn('No tracts found for state FIPS', stateFIPS);
console.warn('Available fields in first record:', Object.keys(data[0]));
}
})
.catch(error => {
console.error('Error loading tract data:', error);
console.error('Make sure CTs_USA_251016 exists in the same directory as index.html');
});
// Load zip code data from JSON
fetch('Zips_Illinois_251222') //check to see if this works..
.then(response => response.json())
.then(data => {
zipData = data;
console.log('Loaded', zipData.length, 'zip code records');
})
.catch(error => console.error('Error loading zip data:', error));
// Fit to county boundary (unless custom center/zoom is specified)
if (!CUSTOM_CENTER && !CUSTOM_ZOOM) {
fitMapToCountyAPI();
}
});
// ============================================
// FUNCTIONS
// ============================================
function fitMapToCountyAPI() {
// Query features and fit to county bounds
let attempts = 0;
const maxAttempts = 10;
function tryFit() {
attempts++;
// Query features at current zoom
const countyFeatures = map.querySourceFeatures('counties-source', {
sourceLayer: 'states',
filter: ['==', ['get', 'GEOID'], COUNTY_GEOID]
});
if (countyFeatures.length > 0) {
const bounds = new mapboxgl.LngLatBounds();
countyFeatures.forEach(feature => {
if (feature.geometry.type === 'Polygon') {
feature.geometry.coordinates[0].forEach(coord => {
bounds.extend(coord);
});
} else if (feature.geometry.type === 'MultiPolygon') {
feature.geometry.coordinates.forEach(polygon => {
polygon[0].forEach(coord => {
bounds.extend(coord);
});
});
}
});
// Store the initial bounds for reset button
if (!initialCountyBounds) {
initialCountyBounds = bounds;
}
map.fitBounds(bounds, {
padding: 50,
duration: 800 // Smooth animation
});
} else if (attempts < maxAttempts) {
// Retry
setTimeout(tryFit, 300);
} else {
console.warn('Could not find county after', maxAttempts, 'attempts. GEOID:', COUNTY_GEOID);
}
}
// Wait for source to load, then start trying
map.on('sourcedata', function handler(e) {
if (e.sourceId === 'counties-source' && e.isSourceLoaded) {
map.off('sourcedata', handler);
tryFit();
}
});
}
// Calculate quantile breaks for a given attribute
function calculateQuantiles(layerType, attribute, numBuckets = 6) {
const sourceData = layerType === 'zip' ? zipData : tractData;
if (!sourceData) return null;
// Use all data in the dataset for quantile calculation
const countyData = sourceData
.map(d => d[attribute])
.filter(v => v !== null && v !== undefined && !isNaN(v))
.sort((a, b) => a - b);
if (countyData.length === 0) {
console.warn('No data found for', layerType, attribute);
return null;
}
const breaks = [];
for (let i = 0; i <= numBuckets; i++) {
const position = (i / numBuckets) * (countyData.length - 1);
const lower = Math.floor(position);
const upper = Math.ceil(position);
const weight = position - lower;
breaks.push(countyData[lower] * (1 - weight) + countyData[upper] * weight);
}
return breaks;
}
// Create fill color expression for data layer
function createFillColorExpression(attribute, breaks) {
const expression = ['case'];
// Reverse loop to assign darkest colors to highest values
for (let i = breaks.length - 2; i >= 0; i--) {
expression.push(
['>=', ['get', attribute], breaks[i]],
COLOR_PALETTE[breaks.length - 2 - i]
);
}
expression.push('#cccccc'); // Default color for no data
return expression;
}
// Update data layer
function updateDataLayer(layerType, attribute) {
console.log('updateDataLayer called with:', layerType, attribute);
console.log('tractData available:', tractData !== null, tractData ? tractData.length : 0);
console.log('zipData available:', zipData !== null, zipData ? zipData.length : 0);
// Close any open popups when changing layers
const popups = document.getElementsByClassName('mapboxgl-popup');
if (popups.length) {
for (let i = popups.length - 1; i >= 0; i--) {
popups[i].remove();
}
}
// Remove existing data layers
if (map.getLayer('tracts-data')) map.removeLayer('tracts-data');
if (map.getLayer('zips-data')) map.removeLayer('zips-data');
if (map.getSource('tracts-data-source')) map.removeSource('tracts-data-source');
if (map.getSource('zips-data-source')) map.removeSource('zips-data-source');
if (!layerType || !attribute) {
document.getElementById('legend').classList.add('hidden');
currentDataLayer = null;
currentLayerName = null; // Clear stored layer name
// Hide tract outline when no data layer is selected
if (map.getLayer('tracts-outline')) {
map.setLayoutProperty('tracts-outline', 'visibility', 'none');
}
// Hide zipcode outline when no data layer is selected
if (map.getLayer('zipcodes-outline')) {
map.setLayoutProperty('zipcodes-outline', 'visibility', 'none');
}
return;
}
// Show/hide tract outline based on layer type
if (map.getLayer('tracts-outline')) {
if (layerType === 'tract') {
map.setLayoutProperty('tracts-outline', 'visibility', 'visible');
} else {
map.setLayoutProperty('tracts-outline', 'visibility', 'none');
}
}
// Show/hide zipcode outline based on layer type
if (map.getLayer('zipcodes-outline')) {
if (layerType === 'zip') {
map.setLayoutProperty('zipcodes-outline', 'visibility', 'visible');
} else {
map.setLayoutProperty('zipcodes-outline', 'visibility', 'none');
}
}
const sourceData = layerType === 'zip' ? zipData : tractData;
if (!sourceData) {
console.warn('Data not loaded yet for', layerType);
return;
}
console.log('Source data loaded, calculating quantiles...');
const breaks = calculateQuantiles(layerType, attribute, 6);
if (!breaks) {
console.warn('Could not calculate breaks for', attribute);
return;
}
if (layerType === 'tract') {
// Handle tract data - show all tracts in the dataset
const countyTracts = tractData;
// Build array of valid tract GEOIDs for filtering
const validTractGEOIDs = countyTracts.map(d => d.geoid);
map.addSource('tracts-data-source', {
type: 'vector',
url: 'mapbox://' + TILESETS.tracts
});
// Build the fill expression using match for better performance
const colorBuckets = Array(6).fill(null).map(() => []);
countyTracts.forEach(d => {
const value = d[attribute];
if (value !== null && value !== undefined) {
let colorIndex = 5; // Default to lightest
for (let i = breaks.length - 2; i >= 0; i--) {
if (value >= breaks[i]) {
colorIndex = breaks.length - 2 - i;
break;
}
}
colorBuckets[colorIndex].push(d.geoid);
}
});
// Build fill expression using match (more efficient than many ==)
const fillExpression = ['match', ['get', 'GEOID']];
// Add each color bucket
colorBuckets.forEach((geoids, index) => {
if (geoids.length > 0) {
geoids.forEach(geoid => {
fillExpression.push(geoid);
fillExpression.push(COLOR_PALETTE[index]);
});
}
});
fillExpression.push('rgba(0,0,0,0)'); // Default for non-matching (transparent)
// Create a match expression to only show tracts in our data
const matchFilter = ['match', ['get', 'GEOID'], validTractGEOIDs, true, false];
// Determine where to insert the layer - always before counties-outline to keep county boundary on top
// This ensures the layer order is: data layers -> county outline -> overlay layers
let insertBeforeLayer = null;
if (map.getLayer('counties-outline')) {
insertBeforeLayer = 'counties-outline';
}
// Insert data layer
map.addLayer({
id: 'tracts-data',
type: 'fill',
source: 'tracts-data-source',
'source-layer': 'tracts',
paint: {
'fill-color': fillExpression,
'fill-opacity': 0.7
},
filter: matchFilter // Only show tracts that exist in our JSON data
}, insertBeforeLayer);
console.log('Tract data layer added with filter for', validTractGEOIDs.length, 'GEOIDs');
} else if (layerType === 'zip') {
// Handle zip code data - filter to only Illinois zips with data
const stateZips = zipData.filter(d => d.geoid && d[attribute] !== null && d[attribute] !== undefined);
console.log('Creating zip data layer for', stateZips.length, 'zips');
console.log('Sample zip GEOIDs from JSON:', stateZips.slice(0, 5).map(d => d.geoid));
console.log('Breaks:', breaks);
map.addSource('zips-data-source', {
type: 'vector',
url: 'mapbox://' + TILESETS.zipcodes
});
// Build array of valid GEOIDs for filtering
const validZipGEOIDs = stateZips.map(d => d.geoid);
// Create a lookup map for faster access
const zipDataLookup = {};
stateZips.forEach(d => {
zipDataLookup[d.geoid] = d[attribute];
});
// Build the fill expression using match for better performance
// First, create arrays of GEOIDs for each color bucket
const colorBuckets = Array(6).fill(null).map(() => []);
stateZips.forEach(d => {
const value = d[attribute];
let colorIndex = 5; // Default to lightest
for (let i = breaks.length - 2; i >= 0; i--) {
if (value >= breaks[i]) {
colorIndex = breaks.length - 2 - i;
break;
}
}
colorBuckets[colorIndex].push(d.geoid);
});
// Build fill expression using match (more efficient than many ==)
// Use GEOID20 which is the actual property name in the tileset
const fillExpression = ['match', ['to-string', ['get', 'GEOID20']]];
// Add each color bucket
colorBuckets.forEach((geoids, index) => {
if (geoids.length > 0) {
geoids.forEach(geoid => {
fillExpression.push(geoid);
fillExpression.push(COLOR_PALETTE[index]);
});
}
});
fillExpression.push('rgba(0,0,0,0)'); // Default for non-matching
console.log('Fill expression has', (fillExpression.length - 1) / 2, 'zip codes');
console.log('Color palette:', COLOR_PALETTE);
// Need to get the correct source-layer name for zips
fetch('https://api.mapbox.com/v4/' + TILESETS.zipcodes + '.json?secure&access_token=' + mapboxgl.accessToken)
.then(response => response.json())
.then(data => {
if (data.vector_layers) {
const sourceLayer = data.vector_layers[0].id;
console.log('Using zip source-layer for data:', sourceLayer);
// Query to check what GEOIDs exist in the tileset
map.on('idle', function checkGeoIds() {
const features = map.querySourceFeatures('zips-data-source', {
sourceLayer: sourceLayer
});
if (features.length > 0) {
console.log('Total features queried from tileset:', features.length);
console.log('Sample tileset GEOIDs (first 10):', features.slice(0, 10).map(f => ({
GEOID20: f.properties.GEOID20,
GEOID20_str: String(f.properties.GEOID20),
type: typeof f.properties.GEOID20,
all_props: Object.keys(f.properties)
})));
console.log('Looking for these IL zips (first 10):', validZipGEOIDs.slice(0, 10));
// Check if any Illinois zips are in the tileset
const ilZips = features.filter(f => {
const geoid = String(f.properties.GEOID20);
return validZipGEOIDs.includes(geoid);
});
console.log('Found', ilZips.length, 'matching Illinois zips in tileset');
if (ilZips.length > 0) {
console.log('Sample matching zip:', ilZips[0].properties);
} else {
// Try to find Illinois zips by checking if they start with common IL prefixes
const ilPrefixes = ['600', '601', '602', '603', '604', '605', '606', '607', '608', '609', '610', '611', '612', '613', '614', '615', '616', '617', '618', '619', '620', '621', '622', '623', '624', '625', '626', '627', '628', '629'];
const possibleILZips = features.filter(f => {
const geoid = String(f.properties.GEOID20);
return ilPrefixes.some(prefix => geoid.startsWith(prefix));
});
console.log('Found', possibleILZips.length, 'possible IL zips by prefix');
if (possibleILZips.length > 0) {
console.log('Sample possible IL zip:', possibleILZips[0].properties);
}
}
map.off('idle', checkGeoIds);
}
});
// Create a match expression to only show zips in our data
// This prevents showing all US zips
// Use GEOID20 which is the actual property name in the tileset
const matchFilter = ['match', ['to-string', ['get', 'GEOID20']], validZipGEOIDs, true, false];
// Determine where to insert the layer - always before counties-outline to keep county boundary on top
// This ensures the layer order is: data layers -> county outline -> overlay layers
let insertBeforeLayer = null;
if (map.getLayer('counties-outline')) {
insertBeforeLayer = 'counties-outline';
}
// Insert data layer
map.addLayer({
id: 'zips-data',
type: 'fill',
source: 'zips-data-source',
'source-layer': sourceLayer,
paint: {
'fill-color': fillExpression,
'fill-opacity': 0.7
},
filter: matchFilter
}, insertBeforeLayer);
console.log('Zip data layer added with filter for', validZipGEOIDs.length, 'GEOIDs');
}
})