---
kind: "section"
citation: "43 U.S.C. § 3101"
title: "43"
title_heading: "Public Lands"
number: "3101"
heading: "Definitions"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/43/3101"
units:
  - "Chapter 49 — National Landslide Preparedness"
---

# §3101. Definitions


In this chapter:

- (1) **3D—** The term “3D” means 3-dimensional.
- (2) **3D elevation data—**
  - (A) **In general—** The term “3D elevation data” means [3D](#1), high-resolution data obtained using [LiDAR](#7), [IfSAR](#4), or other methods over the United States (including [territories](#11)).
  - (B) **Inclusions—** The term “[3D elevation data](#2-A)” includes terrestrial and bathymetric elevation data.
- (3) **3D elevation program—** The term “3D Elevation Program” means the 3D Elevation Program established under [section 3104(a) of this title](/usc/43/3104.md?p=a).
- (4) **IfSAR—** The term “IfSAR” means interferometric synthetic aperture radar.
- (5) **Indian tribe—** The term “Indian tribe” has the meaning given the term in [section 5304 of title 25](/usc/25/5304.md).
- (6) **Lahar—** The term “lahar” means a large debris flow of mostly volcanic material that is—
  - (A) often fast-moving; and
  - (B) a hazard in watersheds downstream of volcanic peaks.
- (7) **LiDAR—** The term “LiDAR” means light detection and ranging.
- (8) **Secretary—** The term “Secretary” means the Secretary of the Interior, acting through the [Director](/usc/43/31b.md?p=3) of the United States Geological [Survey](/usc/43/31b.md?p=10).
- (9) **State—** The term “State” means—
  - (A) a [State](#9); and
  - (B) the District of Columbia.
- (10) **State office—** The term “State office” means any unit of [State](#9) government that handles the identification, mapping, assessment, and research of landslide hazards or responding to landslide events, including—
  - (A) a [State](#9) geological [survey](/usc/43/31b.md?p=10) office;
  - (B) a State department of emergency response; and
  - (C) a State department of transportation.
- (11) **Territory—** The term “territory” means—
  - (A) the Commonwealth of Puerto Rico;
  - (B) Guam;
  - (C) American Samoa;
  - (D) the Commonwealth of the Northern Mariana Islands;
  - (E) the Federated [States](#9) of Micronesia;
  - (F) the Republic of the Marshall Islands;
  - (G) the Republic of Palau; and
  - (H) the United States Virgin Islands.

## Source credit

(Pub. L. 116–323, § 2, Jan. 5, 2021, 134 Stat. 5075.)

## Notes

### Statutory Notes and Related Subsidiaries

### Short Title

Pub. L. 116–323, § 1, Jan. 5, 2021, 134 Stat. 5075, provided that: “This Act [enacting this chapter] may be cited as the ‘National Landslide Preparedness Act’.”