import { GeoJSONFeature } from '../types';
/**
 * Calculate the total area of all features in a collection
 * @param features - Array of features
 * @param unit - Unit for area calculation (default: 'acres')
 * @returns Total area in specified unit
 */
export declare const calculateTotalAreaInUnit: (features: GeoJSONFeature[], unit?: "acres" | "hectares" | "squareMeters" | "squareFeet" | "squareKilometers") => number;
/**
 * Calculate the average area of features
 * @param features - Array of features
 * @param unit - Unit for area calculation (default: 'acres')
 * @returns Average area in specified unit
 */
export declare const calculateAverageArea: (features: GeoJSONFeature[], unit?: "acres" | "hectares" | "squareMeters" | "squareFeet" | "squareKilometers") => number;
/**
 * Find the largest feature by area
 * @param features - Array of features
 * @returns The feature with the largest area
 */
export declare const findLargestFeature: (features: GeoJSONFeature[]) => GeoJSONFeature | null;
/**
 * Find the smallest feature by area
 * @param features - Array of features
 * @returns The feature with the smallest area
 */
export declare const findSmallestFeature: (features: GeoJSONFeature[]) => GeoJSONFeature | null;
/**
 * Calculate the density of features in a given area
 * @param features - Array of features
 * @param boundaryArea - Total boundary area in square meters
 * @returns Feature density (features per square meter)
 */
export declare const calculateFeatureDensity: (features: GeoJSONFeature[], boundaryArea: number) => number;
/**
 * Calculate the total perimeter of all features
 * @param features - Array of features
 * @param unit - Unit for perimeter calculation (default: 'meters')
 * @returns Total perimeter in specified unit
 */
export declare const calculateTotalPerimeter: (features: GeoJSONFeature[], unit?: "meters" | "kilometers" | "miles" | "feet") => number;
/**
 * Calculate the compactness ratio of a polygon (area to perimeter ratio)
 * @param polygon - The polygon feature
 * @returns Compactness ratio (higher = more compact)
 */
export declare const calculateCompactnessRatio: (polygon: GeoJSONFeature) => number;
/**
 * Calculate the elongation ratio of a polygon
 * @param polygon - The polygon feature
 * @returns Elongation ratio (1 = perfect circle, higher = more elongated)
 */
export declare const calculateElongationRatio: (polygon: GeoJSONFeature) => number;
/**
 * Calculate the aspect ratio of a polygon's bounding box
 * @param polygon - The polygon feature
 * @returns Aspect ratio (width / height)
 */
export declare const calculateAspectRatio: (polygon: GeoJSONFeature) => number;
/**
 * Calculate the circularity of a polygon
 * @param polygon - The polygon feature
 * @returns Circularity (1 = perfect circle, 0 = very irregular)
 */
export declare const calculateCircularity: (polygon: GeoJSONFeature) => number;
/**
 * Calculate the fractal dimension of a polygon (complexity measure)
 * @param polygon - The polygon feature
 * @returns Fractal dimension (higher = more complex)
 */
export declare const calculateFractalDimension: (polygon: GeoJSONFeature) => number;
/**
 * Calculate the efficiency of a polygon (how close to a circle)
 * @param polygon - The polygon feature
 * @returns Efficiency ratio (1 = perfect circle, lower = less efficient)
 */
export declare const calculateEfficiency: (polygon: GeoJSONFeature) => number;
/**
 * Calculate the shape index of a polygon
 * @param polygon - The polygon feature
 * @returns Shape index (1 = perfect circle, higher = more irregular)
 */
export declare const calculateShapeIndex: (polygon: GeoJSONFeature) => number;
/**
 * Calculate the roundness of a polygon
 * @param polygon - The polygon feature
 * @returns Roundness (1 = perfect circle, 0 = very angular)
 */
export declare const calculateRoundness: (polygon: GeoJSONFeature) => number;