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/**
* Utility functions for calculating rectangular farm boundaries
*/
/**
* Calculate the 4 corner points of a rectangle from center point and farm size
* @param centerLat - Center latitude
* @param centerLng - Center longitude
* @param farmSizeHectares - Farm size in hectares
* @returns Object containing the 4 corner points
*/
export function calculateRectangleCorners(
centerLat: number,
centerLng: number,
farmSizeHectares: number
) {
// Convert hectares to square meters
const farmSizeSquareMeters = farmSizeHectares * 10000;
// Calculate the side length of a square with this area
const sideLengthMeters = Math.sqrt(farmSizeSquareMeters);
// Convert meters to degrees (approximate)
// 1 degree latitude ≈ 111,000 meters
// 1 degree longitude ≈ 111,000 * cos(latitude) meters
const latOffset = sideLengthMeters / (2 * 111000);
const lngOffset = sideLengthMeters / (2 * 111000 * Math.cos(centerLat * Math.PI / 180));
return {
northEast: {
lat: centerLat + latOffset,
lng: centerLng + lngOffset,
altitude: 0
},
northWest: {
lat: centerLat + latOffset,
lng: centerLng - lngOffset,
altitude: 0
},
southEast: {
lat: centerLat - latOffset,
lng: centerLng + lngOffset,
altitude: 0
},
southWest: {
lat: centerLat - latOffset,
lng: centerLng - lngOffset,
altitude: 0
}
};
}
/**
* Calculate rectangle dimensions from farm size
* @param farmSizeHectares - Farm size in hectares
* @returns Object with width and height in meters
*/
export function calculateRectangleDimensions(farmSizeHectares: number) {
const farmSizeSquareMeters = farmSizeHectares * 10000;
const sideLengthMeters = Math.sqrt(farmSizeSquareMeters);
return {
width: sideLengthMeters,
height: sideLengthMeters
};
}
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