2023 NOAA NGS Topobathy Lidar: Long Island Sound, NY Point Cloud files with Vertical Datum North American Vertical Datum of 1988 (NAVD88) using GEOID18

Below are links to the files that make up the 2023 NOAA NGS Topobathy Lidar: Long Island Sound, NY dataset.

Vertical datumNorth American Vertical Datum of 1988 (NAVD88) using GEOID18 in meters
Horizontal projection/datumNAD83(2011) / UTM zone 18N

Informational files are listed first (such as geospatial indices, metadata, and so on), followed by the files. To download in bulk, it is suggested you use a download manager such as wget, uget, or filezilla for example. The geospatial index file in shapefile format also has a URL attribute that some GIS programs can use to download files. You can also subset the data, make derived products, and change projection, datum, etc., using the Digital Coast Data Access Viewer (add to cart, the link to bulk download will take you here).

The files are in LAZ format, a lossless compressed version of the ASPRS LAS format. The compression and decompression can be done with the free and open source 'laszip' program available at https://rapidlasso.de/laszip/ (source at https://github.com/LASzip/LASzip). This is not the same as the more general zip format. You may also want to try the uGet program using the list of URLs in file urllist_2023_ngs_topobathy_longIslandSound_m10273.txt. Several posts on the GeoZone blog provide help with downloading, including:

Example to download entire data set using wget (note: sufficiently new and trusted pre-compiled Windows versions can be hard to find):
wget -np -r -nH -L --cut-dirs=2 https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/10273/index.html/
This will give you the directory structure starting with geoid18. Modify the --cut-dirs=2 argument to modify the start directory (e.g. --cut-dirs=4 will start at $missionid). Wget is a command-line program and the output will be to the directory you run it in. More options and information can be found at https://www.gnu.org/software/wget/manual/wget.html. The other options in the example mean:


If you have problems with wget that look like an authorization or certificate issue, you may need to add the option "--no-check-certificate". Windows users may want to install the Windows Subsystem for Linux to get a current wget.

The total size to download all the files is 659G. There are 17399 LAZ files and the summary class table is:

Class NumberClass NamePoints
1Unclassified35627016168
2Ground16867356258
7Low Point (noise)17
40Bathymetric point3779585092
41Water surface2016645194
42Derived water surface30512970982
43Submerged Object289916
45Water column18225139714
64Submerged Vegetation258661
65Submerged Temporal Exclusion24740575

Cloud Access

This data is in an AWS S3 bucket at s3://noaa-nos-coastal-lidar-pds/laz/geoid18/10273.

Meta Information

Tile Index: tileindex_2023_ngs_topobathy_longIslandSound_m10273.zip (Shapefile)
Tile Index: tileindex_2023_ngs_topobathy_longIslandSound_m10273.gpkg (Geopackage)
Metadata: metadata_2023_ngs_topobathy_longIslandSound.xml
Metadata: metadata_2023_ngs_topobathy_longIslandSoundforHumans.html
XYZ range table: minmax_2023_ngs_topobathy_longIslandSound_m10273.csv
URL List: urllist_2023_ngs_topobathy_longIslandSound_m10273.txt

Supplemental Info

Files

NOAA_NY_Long_Island_Topobathymetric_Lidar_Imagery_Report_Final.pdf
extent_ngs_longIslandSound_topobathy_m10273.kmz

Spatial Temporal Asset Catalog (STAC)

Entwine Format

See entwine.io for more information on the Entwine Point Tile format.

EPT JSON file
View Point Data in Potree 3D Viewer

Point Cloud Directories

Block01
Block02
Block03
Block04

This page is owned by the NOAA Office for Coastal Management and was created by an automated script on 2025-06-04 23:12:31.141904.
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