2022 NOAA NGS Topobathy Lidar: Ofu and Olesega, American Samoa Point Cloud files with Orthometric Vertical Datum American Samoa Vertical Datum of 2002 (ASVD02) using GEOID12B

Below are links to the files that make up the 2022 NOAA NGS Topobathy Lidar: Ofu and Olesega, American Samoa dataset in an orthometric vertical datum American Samoa Vertical Datum of 2002 (ASVD02) using GEOID12B. This HTML file is here to emulate the access typical of an ftp site. The files containing geospatial indices, metadata, etc., are listed first, followed by the files. To download in bulk, it is suggested you use a program such as wget (example below). 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 North American Datum of 1983 (NAD83). The version of the NAD83 datum may vary slightly, but all are one of the updated realizations such as the High Accuracy Reference Network (HARN), Continuously Operating Reference System of 1996 (CORS96), or National Spatial Reference System of 2007 (NSRS2007), and not the original NAD83(86). This may not be evident in the metadata. Vertical units are meters and all have been converted from NAD83 ellipsoid heights to orthometric American Samoa Vertical Datum of 2002 (ASVD02) heights using GEOID12B.

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://laszip.org. 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 urllist10083.txt. Several posts on the GeoZone blog provide help with downloading, including:

• Using uGet to download bulk lidar
• Downloading a subset of files based on a polygon
• Downloading on Windows without additional programs

The total size to download all the files is 20G. There are 383 LAZ files and the summary class table is:

Cloud Access

Meta Info

Tile Index: tileindex.zip (Shapefile)
                NGS_AS_ofuolosega_index.gpkg (GeoPackage)
Metadata: NGS_AS_ofuolosega_metadata.xml
Metadata: NGS_AS_ofuolosega_metadata.html
XYZ range table: NGS_AS_ofuolosega_minmax.csv
URL List: urllist10083.txt is a list of all the URLs for batch downloading.

STAC catalogs/collections

Supplemental Info

Point Clouds

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