2021 NOAA NGS Topobathy Lidar: Revillagigedo Channel, Southeast Alaska

Topobathymetric lidar point cloud data covering 253,401 acres of coastal Southeast Alaska, collected by NV5 Geospatial for NOAA between June and August 2021. The data includes classifications for ground, water surface, bathymetric bottom, submerged aquatic vegetation, and water column, captured using Leica Hawkeye and Riegl sensor systems. The dataset is delivered in four blocks, each with intensity values, return numbers, time, and scan angle.

Use Cases

• Model coastal erosion and inundation based on integrated topographic and bathymetric elevation data.
• Map submerged aquatic vegetation (SAV) habitats based on the SAV classification code.
• Analyze water column properties and submerged features for hydrological studies.
• Calibrate and validate synthetic water surface models based on the synthetic water surface classifications.

Strengths

• Covers a large, defined area of 253,401 acres across four blocks.
• Uses standardized ASPRS classification codes for 17 distinct feature types.
• Includes data from multiple sensor channels (Riegl NIR, Chiroptera green, Hawkeye green) as specified in the user byte mapping.
• Underwent a feedback edit review and correction process by NOAA and NV5 Geospatial.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The primary file format listed is PDF, which may not be the native data format.

Provenance

Source

National Oceanic and Atmospheric Administration, Department of Commerce

Collection Method

Collected via airborne lidar systems (Leica Hawkeye 4X, Riegl 1560i) by NV5 Geospatial.

Time Range

2021-06 2021-08

Freshness

Last updated 2026-03-13 21:58:24.164418; freshness should be verified.

Geography

Revillagigedo Channel, Southeast Alaska