<div id="output" style="font-weight:bold; font-size:1.2em; margin: 1em 0;">
Loading noise complaint data...
</div>
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const cbdGeojson = {
"type": "FeatureCollection",
"name": "CBD",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::2263" } },
"features": [
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}
;
const polygon = cbdGeojson.features[0];
function formatDate(date) {
return date.toISOString().split('.')[0];
}
const today = new Date();
const currentYear = today.getFullYear();
const lastYear = currentYear - 1;
const startMonthDay = '01-05';
function buildRange(year) {
const startDate = new Date(`${year}-${startMonthDay}T00:00:00`);
let endDate = year === currentYear ? today : new Date(`${year}-${(today.getMonth()+1).toString().padStart(2,'0')}-${today.getDate().toString().padStart(2,'0')}T23:59:59`);
if (endDate < startDate) endDate = startDate;
return {
start: formatDate(startDate),
end: formatDate(endDate),
};
}
const ranges = {
[lastYear]: buildRange(lastYear),
[currentYear]: buildRange(currentYear),
};
const baseUrl = 'https://data.cityofnewyork.us/resource/erm2-nwe9.json';
const limit = 5000;
async function fetchAllForRange(start, end) {
let offset = 0;
let allData = [];
while (true) {
const whereClause = `complaint_type='Noise - Vehicle' AND created_date between '${start}' and '${end}'`;
const url = `${baseUrl}?$where=${encodeURIComponent(whereClause)}&$limit=${limit}&$offset=${offset}`;
const res = await fetch(url);
const data = await res.json();
if (data.length === 0) break;
allData = allData.concat(data);
offset += limit;
if (data.length < limit) break;
}
return allData;
}
function countInPolygon(data) {
return data.filter(item => {
if (!item.latitude || !item.longitude) return false;
const pt = turf.point([parseFloat(item.longitude), parseFloat(item.latitude)]);
return turf.booleanPointInPolygon(pt, polygon);
}).length;
}
async function runComparison() {
try {
const counts = {};
for (const year of [lastYear, currentYear]) {
const range = ranges[year];
const data = await fetchAllForRange(range.start, range.end);
counts[year] = countInPolygon(data);
}
const diff = counts[currentYear] - counts[lastYear];
const pctChange = counts[lastYear] === 0 ? (diff === 0 ? 0 : 100) : (diff / counts[lastYear]) * 100;
let message = '';
if (pctChange > 0) {
message = `Noise Complaints in the Congestion Zone - Up ${pctChange.toFixed(1)}%`;
} else if (pctChange < 0) {
message = `Noise Complaints in the Congestion Zone - Down ${Math.abs(pctChange).toFixed(1)}%`;
} else {
message = `Noise Complaints in the Congestion Zone - No Change`;
}
document.getElementById('output').textContent = message;
} catch (e) {
document.getElementById('output').textContent = 'Error: ' + e;
}
}
runComparison();
</script>
