johnlam1968.github.io/index.html at main · johnlam1968/johnlam1968.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Airborne Plane Tracker</title>
    <style>
        body { font-family: monospace; white-space: pre; background-color: #1e1e1e; color: #d4d4d4; }
        h1 { font-size: 1.2em; }
        .error { color: red; }
        .noisy { color: yellow; }
    </style>
</head>
<body>
    <h1>Local Air Traffic Monitor</h1>
    <p id="status">Waiting for location access...</p>
    <pre id="output"></pre>

    <script>
        // Configuration and Constants
        const BASE_URL = 'https://api.airplanes.live/v2/point/';
        const _radius = 5; // nautical miles
        const _distance_threshold = 7000; // feet
        const NM_TO_FEET = 6076.115;
        const UPDATE_INTERVAL_MS = 1010; // 1.01 seconds

        let userLatitude = null;
        let userLongitude = null;
        let updateTimer = null;
        const statusElement = document.getElementById('status');
        const outputElement = document.getElementById('output');

        // --- Core Data Processing Function ---
        async function fetchAndProcessPlanes() {
            if (userLatitude === null || userLongitude === null) {
                outputElement.textContent = "Location not yet determined.";
                return;
            }

            const url = `${BASE_URL}${userLatitude.toFixed(3)}/${userLongitude.toFixed(3)}/${_radius}`;

            statusElement.textContent = `Tracking location: Lat ${userLatitude.toFixed(3)}, Lon ${userLongitude.toFixed(3)}`;

            try {
                const response = await fetch(url);
                if (!response.ok) {
                    throw new Error(`HTTP error! status: ${response.status}`);
                }
                const data = await response.json();

                const aircraftList = data.ac || [];
                const totalFound = data.total || 0;

                if (aircraftList.length === 0) {
                    outputElement.innerHTML = `Total found ${totalFound}\nCould not find planes`;
                    return;
                }

                // --- Filtering and Processing ---

                let air_borne = aircraftList
                    .filter(ac => {
                        // 1. Filter out ground planes and check for required data
                        return ac.alt_baro !== 'ground' &&
                                ac.alt_baro != null &&
                                ac.dst != null &&
                                ac.gs != null;
                    })
                    .map(ac => {
                        // 2. Convert necessary string values to number (float)
                        const alt_ft = parseFloat(ac.alt_baro);
                        const dst_nm = parseFloat(ac.dst);
                        const gs_val = parseFloat(ac.gs);

                        // Check if conversions resulted in valid numbers
                        if (isNaN(alt_ft) || isNaN(dst_nm) || isNaN(gs_val)) {
                            return null; // Mark for later removal
                        }

                        // 3. Apply altitude mask (3500 ft > alt > 0 ft)
                        if (alt_ft <= 0 || alt_ft >= 3500) {
                            return null;
                        }

                        // 4. Calculate 'distance' (hypotenuse calculation)
                        const horizontal_dist_ft = dst_nm * NM_TO_FEET;
                        const distance_ft = Math.sqrt(horizontal_dist_ft ** 2 + alt_ft ** 2);

                        // Store the final, filtered, and calculated data
                        return {
                            alt_baro: alt_ft,
                            gs: gs_val,
                            dst_nm: dst_nm,
                            distance: distance_ft
                        };
                    })
                    .filter(p => p !== null); // Remove any planes that returned null (invalid/out-of-range)

                // --- Display Results ---
                let output = `Total found ${totalFound}\n`;
                output += "Airborne planes (0-3500 ft):\n";
                output += "ALT_FT | GS | DST_NM | DISTANCE_FT\n";
                output += "---------------------------------------\n";

                for (const p of air_borne) {
                    output += `${p.alt_baro.toFixed(0).padEnd(6)} | ${p.gs.toFixed(0).padEnd(2)} | ${p.dst_nm.toFixed(2).padEnd(6)} | ${p.distance.toFixed(2).padEnd(11)}\n`;
                }

                output += "\nNoisy planes (< 7000 ft total distance):\n";

                // Apply the distance threshold filter
                const noisyPlanes = air_borne.filter(p => p.distance < _distance_threshold);

                if (noisyPlanes.length > 0) {
                    output += "ALT_FT | GS | DST_NM | DISTANCE_FT\n";
                    output += "---------------------------------------\n";
                    for (const p of noisyPlanes) {
                        output += `<span class="noisy">${p.alt_baro.toFixed(0).padEnd(6)} | ${p.gs.toFixed(0).padEnd(2)} | ${p.dst_nm.toFixed(2).padEnd(6)} | ${p.distance.toFixed(2).padEnd(11)}</span>\n`;
                    }
                } else {
                    output += "None\n";
                }

                output += "---------------------------------------";
                outputElement.innerHTML = output;

            } catch (e) {
                outputElement.innerHTML = `<span class="error">Request error: ${e.message}</span>`;
            }
        }

        // --- Geolocation Functions ---
        function startTracking(position) {
            userLatitude = position.coords.latitude;
            userLongitude = position.coords.longitude;

            // Initial run
            fetchAndProcessPlanes();

            // Set up the automatic update loop
            if (updateTimer === null) {
                 updateTimer = setInterval(fetchAndProcessPlanes, UPDATE_INTERVAL_MS);
            }
        }

        function locationError(error) {
            statusElement.textContent = `Location Error: ${error.message}. Cannot track planes.`;
            clearInterval(updateTimer);
        }

        function getInitialLocation() {
            if (navigator.geolocation) {
                navigator.geolocation.getCurrentPosition(startTracking, locationError, {
                    enableHighAccuracy: true,
                    timeout: 15000,
                    maximumAge: 0
                });
            } else {
                statusElement.textContent = "Geolocation is not supported by your browser.";
            }
        }

        // --- Start the application ---
        getInitialLocation();
    </script>
</body>
</html>