Below are links to the files that make up the 2021 - 2023 NOAA NGS Topobathy Lidar: French Frigate Shoals and Nihoa, Hawaii dataset in an orthometric vertical datum using EGM08. The files containing geospatial indices, metadata, etc., are listed first, 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 or LAZ fmt will take you here).
The data are all in geographic coordinates using the World Geodetic System of 1984 (WGS84). Vertical units are meters and all have been converted from WGS84 ellipsoid heights to orthometric Earth Gravitational Model 2008 (EGM2008) heights using EGM08.
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 urllist10190.txt. Several posts on the GeoZone blog provide help with downloading, including:
The total size to download all the files is 547G. There are 18806 LAZ files and the summary class table is:
| Class Number | Class Name | Points |
|---|---|---|
| 1 | Unclassified | 6646087 |
| 2 | Ground | 32574227 |
| 7 | Low Point (noise) | 55690 |
| 9 | Water | 16356543008 |
| 18 | High Noise | 672 |
| 40 | Bathymetric point | 9474429950 |
| 41 | Water surface | 18952842799 |
| 42 | Derived water surface | 45182278063 |
| 43 | Submerged Object | 133 |
Georeferencing found in files: Projected WGS 84; EGM2008 geoid height
Tile Index: tileindex.zip (Shapefile)
2021_ngs_nwhi_topobathy_index.gpkg (GeoPackage)
Metadata: 2021_ngs_nwhi_topobathy_metadata.xml
Metadata: 2021_ngs_nwhi_topobathy_metadata.html
XYZ range table: 2021_ngs_nwhi_topobathy_minmax.csv
URL List: urllist10190.txt is a list of all the URLs for batch downloading.
This page is owned by the NOAA Office for Coastal Management and was created by an automated script on Thu Nov 7 04:48:30 EST 2024.
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