2014 USACE NCMP Topobathy Lidar: California Point Cloud files with Orthometric Vertical Datum North American Vertical Datum of 1988 (NAVD88) using GEOID18
Below are links to the files that make up the 2014 USACE NCMP Topobathy Lidar: California dataset in an orthometric vertical datum North American Vertical Datum of 1988 (NAVD88) using GEOID18. This HTML
file is here to emulate the access you would have gotten through 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 files are in LAZ format, a lossless compressed version of the ASPRS LAS format. The compression and
decompression is done with the free and open source 'laszip' program available at
http://laszip.org. This is not the same as the more general zip format.
Many geospatial programs will read LAZ files natively and decompression is often not necessary. There is a list
of software with native support on the laszip site.
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://chs.coast.noaa.gov/htdata/lidar4_z/geoid18/data/4912/
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 4912). 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 http://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.
You can also use the uGet program with the list of URLs in file urllist4912.txt.
Several posts on the GeoZone blog provide help with downloading, including:
The total size to download all the files is 17G. There are 117 LAZ files and the summary class table is:
|Class Number||Class Name||Points|
If you need FTP access instead of HTTPS, use ftp://ftp.coast.noaa.gov/pub/DigitalCoast/lidar4_z/geoid18/data/4912
You may find the georeferencing on the files refers to generic NAD83 (EPSG code 4269). All files,
with the exception of the few in WGS84, are in a more recent realization of NAD83 such as
NAD83(CORS96), NAD83(HARN), NAD83(NSRS2007), or NAD83(2011).
Tile Index: tileindex.zip (Shapefile)
XYZ range table: ca2014_usace_ncmp_ca_minmax.csv
README: 0README.txt (contains similar information to above)
URL List: urllist4912.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 Fri Sep 3 07:31:58 EDT 2021