/**
 * ASPRS LAS point classification helpers (#1783).
 *
 * The LAS specification (ASPRS LAS 1.1 through 1.4 R15) defines
 * classes 0..22, reserves 23..63 for future ASPRS use, and leaves
 * 64..255 to the producer. Decoders emit the raw per-point byte in
 * `DecodedPointChunk.classifications`; these helpers aggregate that
 * into a per-class histogram and map codes to their standard names so
 * UIs never have to show a bare integer.
 */
import type { DecodedPointChunk } from './types.js';
/** Total number of representable LAS classification codes (one byte). */
export declare const LAS_CLASS_COUNT = 256;
/**
 * Human-readable name for a LAS classification code.
 * 0..22 use the ASPRS standard names, 23..63 are "Reserved" and
 * 64..255 "User defined" per the spec. Out-of-range codes (the byte
 * field can't actually produce them) return "Unknown".
 */
export declare function lasClassificationName(classId: number): string;
/** Allocate an all-zero per-class histogram (one slot per LAS code). */
export declare function createClassificationCounts(): Uint32Array;
/**
 * Fold one decoded chunk into a per-class histogram.
 * Returns true when the chunk carried a classifications buffer (so
 * callers can distinguish "no classes anywhere" from "all zeros").
 */
export declare function accumulateClassificationCounts(counts: Uint32Array, chunk: Pick<DecodedPointChunk, 'classifications' | 'pointCount'>): boolean;
export interface ClassificationCountEntry {
    classId: number;
    count: number;
}
/** Non-zero histogram slots as `{ classId, count }`, ascending by code. */
export declare function classificationCountEntries(counts: Uint32Array): ClassificationCountEntry[];
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