Mr.Haruna
67 lines
2.2 KiB
PHP
67 lines
2.2 KiB
PHP
<?php
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/**
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* geo_helper.php
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* Tanggung Jawab: Menyediakan fungsi matematika spasial manual (seperti Haversine).
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*/
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class GeoHelper {
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/**
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* Menghitung jarak antara dua koordinat geografis menggunakan Haversine Formula.
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* Mengembalikan jarak dalam satuan Kilometer.
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*/
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public static function haversineDistance($lat1, $lon1, $lat2, $lon2) {
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$earthRadius = 6371; // Jari-jari bumi dalam kilometer
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$dLat = deg2rad($lat2 - $lat1);
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$dLon = deg2rad($lon2 - $lon1);
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$a = sin($dLat / 2) * sin($dLat / 2) +
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cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
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sin($dLon / 2) * sin($dLon / 2);
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$c = 2 * atan2(sqrt($a), sqrt(1 - $a));
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$distance = $earthRadius * $c;
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return $distance;
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}
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/**
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* Mencari Warga Miskin dalam radius tertentu dari suatu titik (Rumah Ibadah).
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*/
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public static function getWargaDalamRadius($pdo, $pusatLat, $pusatLon, $radiusKm = 1.0) {
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// Ambil semua data warga miskin
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$stmt = $pdo->query("SELECT id, nama_kk, penghasilan, jumlah_tanggungan, ST_AsGeoJSON(geom) as geojson FROM warga_miskin");
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$wargaDalamRadius = [];
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while ($row = $stmt->fetch()) {
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$geom = json_decode($row['geojson'], true);
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// GeoJSON Point format: [Longitude, Latitude]
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$wargaLon = $geom['coordinates'][0];
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$wargaLat = $geom['coordinates'][1];
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// Hitung jarak dengan Haversine
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$jarak = self::haversineDistance($pusatLat, $pusatLon, $wargaLat, $wargaLon);
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if ($jarak <= $radiusKm) {
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$wargaDalamRadius[] = [
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'id' => $row['id'],
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'nama_kk' => $row['nama_kk'],
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'penghasilan' => $row['penghasilan'],
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'jumlah_tanggungan' => $row['jumlah_tanggungan'],
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'jarak_km' => round($jarak, 2),
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'geometry' => $geom
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];
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}
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}
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// Urutkan berdasarkan jarak terdekat
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usort($wargaDalamRadius, function($a, $b) {
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return $a['jarak_km'] <=> $b['jarak_km'];
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});
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return $wargaDalamRadius;
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}
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}
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?>
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