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This commit is contained in:
Jake Kasper
2025-09-05 14:55:10 -04:00
parent 4872cff378
commit a3112efee0
1 changed files with 6 additions and 23 deletions
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29
backend/src/routes/properties.js
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@@ -13,41 +13,24 @@ const calculatePolygonArea = (coordinates) => {
console.log('Invalid coordinates for area calculation:', coordinates); console.log('Invalid coordinates for area calculation:', coordinates);
return 0; return 0;
} }
console.log('Calculating area for coordinates:', coordinates); console.log('Calculating area for coordinates:', coordinates);
// Shoelace formula for polygon area
// Coordinates are in [latitude, longitude] format (not GeoJSON standard)
let area = 0; let area = 0;
const n = coordinates.length; const n = coordinates.length;
for (let i = 0; i < n; i++) { for (let i = 0; i < n; i++) {
const j = (i + 1) % n; const j = (i + 1) % n;
// coordinates[i][0] = latitude, coordinates[i][1] = longitude area += coordinates[i][1] * coordinates[j][0];
area += coordinates[i][1] * coordinates[j][0]; // lng * lat area -= coordinates[j][1] * coordinates[i][0];
area -= coordinates[j][1] * coordinates[i][0]; // lng * lat
} }
area = Math.abs(area) / 2; area = Math.abs(area) / 2;
console.log('Raw shoelace area (in deg²):', area); console.log('Raw shoelace area (in deg²):', area);
const avgLat = coordinates.reduce((sum, coord) => sum + coord[0], 0) / n;
// Convert from decimal degrees to square feet
// coordinates are [latitude, longitude] format
const avgLat = coordinates.reduce((sum, coord) => sum + coord[0], 0) / n; // coord[0] is latitude
console.log('Average latitude:', avgLat); console.log('Average latitude:', avgLat);
const metersPerDegreeLat = 111320;
// More accurate conversion using Haversine-based approach const metersPerDegreeLng = 111320 * Math.cos(avgLat * Math.PI / 180);
const latInRadians = avgLat * Math.PI / 180;
const metersPerDegreeLat = 111320; // meters per degree latitude (constant)
const metersPerDegreeLng = 111320 * Math.cos(latInRadians); // meters per degree longitude (varies with latitude)
// Convert to square meters, then to square feet
const areaInSquareMeters = area * metersPerDegreeLat * metersPerDegreeLng; const areaInSquareMeters = area * metersPerDegreeLat * metersPerDegreeLng;
const areaInSquareFeet = areaInSquareMeters * 10.7639; // 1 m² = 10.7639 ft² const areaInSquareFeet = areaInSquareMeters * 10.7639;
console.log('Area in square meters:', areaInSquareMeters); console.log('Area in square meters:', areaInSquareMeters);
console.log('Area in square feet:', areaInSquareFeet); console.log('Area in square feet:', areaInSquareFeet);
return areaInSquareFeet; return areaInSquareFeet;
}; };