2018 NOAA NGS Topobathy Lidar: Potomac River, Chesapeake Bay 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 2018 NOAA NGS Topobathy Lidar: Potomac River, Chesapeake Bay dataset.

Vertical datum	North American Vertical Datum of 1988 (NAVD88) using GEOID18 in meters
Horizontal projection/datum	NAD83(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_2018_ngs_topobathy_potomac_river_chesapeake_m8727.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/geoid18/8727/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:

-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 303G. There are 5968 LAZ files and the summary class table is:

Class Number	Class Name	Points
1	Unclassified	38271248397
2	Ground	4304719226
7	Low Point (noise)	66868721
25	Water column	5057331779
26	Bathymetric point	608855730
29	Submerged Object	202788
30	Submerged Aquatic Vegetation	225294
31	Temporal bathy bottom	30551168

Cloud Access

This data is in an AWS S3 bucket at s3://noaa-nos-coastal-lidar-pds/laz/geoid18/8727.

Meta Information

Tile Index: tileindex_2018_ngs_topobathy_potomac_river_chesapeake_m8727.zip (Shapefile)
Tile Index: tileindex_2018_ngs_topobathy_potomac_river_chesapeake_m8727.gpkg (Geopackage)
Metadata: metadata_2018_ngs_topobathy_potomac_river_chesapeake.xml
Metadata: metadata_2018_ngs_topobathy_potomac_river_chesapeakeforHumans.html
XYZ range table: minmax_2018_ngs_topobathy_potomac_river_chesapeake_m8727.csv
URL List: urllist_2018_ngs_topobathy_potomac_river_chesapeake_m8727.txt

Supplemental Info

Files

2018_ngs_topobathy_potomac_river_m8727.kmz

Spatial Temporal Asset Catalog (STAC)

collection.json (See collection in STAC Browser)
noaa_copc_item_collection_m8727.json

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

Delivery01
Delivery02

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