2025 NOAA OCS Topobathy Lidar: Thunder Bay NMS (H14138), MI Point Cloud files with Vertical Datum using IGLD85

Below are links to the files that make up the 2025 NOAA OCS Topobathy Lidar: Thunder Bay NMS (H14138), MI dataset.

Vertical datum	using IGLD85 in meters
Horizontal projection/datum	NAD83(2011) / UTM zone 16N

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_mi2025_thndrbay_h14138_m15623.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/igld85/15623/index.html/
This will give you the directory structure starting with igld85. 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:

-np = don't grab the parent directory
-r = recursive (descend into directories)
-nH = don't generate host-prefixed directories
-L = follow relative links only (so you don't download wget just because it's linked here)

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 27G. There are 803 LAZ files and the summary class table is:

Class Number	Class Name	Points
1	Unclassified	229372470
2	Ground	4890
40	Bathymetric point	551139905
41	Water surface	151318417
42	Derived water surface	2432556166
43	Submerged Object	50227
45	Water column	1093616210

Cloud Access

This data is in an AWS S3 bucket at s3://noaa-nos-coastal-lidar-pds/laz/igld85/15623.

Meta Information

Tile Index: tileindex_mi2025_thndrbay_h14138_m15623.zip (Shapefile)
Tile Index: tileindex_mi2025_thndrbay_h14138_m15623.gpkg (Geopackage)
Metadata: metadata_mi2025_thndrbay_h14138.xml
Metadata: metadata_mi2025_thndrbay_h14138forHumans.html
XYZ range table: minmax_mi2025_thndrbay_h14138_m15623.csv
URL List: urllist_mi2025_thndrbay_h14138_m15623.txt

Supplemental Info

Files

H14138_Survey_Metadata.pdf

Spatial Temporal Asset Catalog (STAC)

collection.json (See collection in STAC Browser)
noaa_copc_item_collection_m15623.json

Links to Related Datasets

Title	Bulk Download	Data Access Viewer	ID #
2025 NOAA OCS Topobathy Lidar DEM: Thunder Bay NMS (H14138), MI	bulk link	DAV	15625

Point Cloud Files

This page is owned by the NOAA Office for Coastal Management and was created by an automated script on 2026-09-15 17:24:23.469183.
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