2023 NOAA NGS Lidar: Long Island Sound, NY

NOAA Long Island Sound Topobathymetric Lidar data were collected by NV5 using Leica Chiroptera/Hawkeye 4X and Chiroptera/Hawkeye 5 systems in four blocks.  Block01 was flown between 20230305 and 20230411 in 14 missions, block02 was flown between 20230305 and 20230722 in 23 missions, block03 was flown between 20230316 and 20231028 in 13 missions and block04 was flown between 20230410 and 20230530 in 19 missions.


All data in each block includes topobathymetric data in a LAS format 1.4, point data record format 6, with the following classifications in accordance with project specifications and the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards:
			
			1   - Unclassified
			1W  - Withheld - edge clip 
			1OW - Overlap Withheld - unrefracted green data from Chiroptera sensor
			2   - Ground
			7W  - Withheld -low noise
			18W - Withheld - high noise
			40  - Bathymetric bottom or submerged topography
			41  - Water surface
			42S - Synthetic- Chiroptera synthetic water surface
			43  - Submerged feature
			45  - Water column
			64  - Submerged Aquatic Vegetation (SAV)
			65 - Overlap bathy bottom - temporally different from a separate lift
			71  - Unclassified associated with areas of overlap bathy bottom/temporal bathymetric differences
			72  - Ground associated with areas of overlap bathy bottom/temporal bathymetric differences
			81  - Water surface associated with areas of overlap bathy bottom/temporal bathymetric differences
			82S - Synthetic - Chiroptera synthetic water surface associated with areas of overlap bathy bottom/temporal bathymetric differences
			85  - Water column associated with areas of overlap bathy bottom/temporal bathymetric differences.
			
			The channel bits are mapped as the following:
			0 - Chiroptera green shallow laser
			1 - Chiroptera/Hawkeye synthetic water surface
			2 - Hawkeye green deep laser
			3 - Chiroptera NIR
			
			The user byte is mapped as the following:
			10 - Chiroptera green shallow
			11 - Chiroptera green shallow 4X
			12 - Chiroptera green shallow synthetic
			20 - Hawkeye green deep
			21 - Hawkeye green deep 4X
			22 - Hawkeye green deep synthetic
			30 - Chiroptera NIR
			
This dataset also includes lidar intensity values, number of returns, return number, time, and scan angle. 

After each initial Long Island Sound Topobathymetric Lidar block Delivery submission, NOAA reviewed the data and provided NV5 with a feedback edit review. NV5 has corrected these feedback edits and incorporated them into the final block datasets .  Additionally, green laser intensity values were normalized for depth resulting in a full redelivery of all LAS files in block02 and block04.   LAS files were compiled in 500 m x 500 m tiles.

Tags: airplane, bathymetry, bathymetry/seafloor topography, coastal bathymetry, coastal elevation, coastal processes, connecticut, continent, doc/noaa/nos/ngs, earth science, land surface, lidar, light detection and ranging, national geodetic survey, national ocean service, new york, ngs lidar, noaa, north america, oceans, terrain elevation, topographical relief maps, topography, u.s. department of commerce, united states of america
Organization: National Oceanic and Atmospheric Administration, Department of Commerce