2010 FEMA Lidar: Concord River (MA) 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 2010 FEMA Lidar: Concord River (MA) 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 https://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.

There are many download managers you can use to get all the data. An example is the uGet program using the list of URLs in file urllist2549.txt. Several posts on the GeoZone blog provide help with downloading, including:

The total size to download all the files is 11G. There are 500 LAZ files and the summary class table is:

Class Number Class Name Points

0 Never Classified 74
1 Unclassified 953350870
2 Ground 712954314
3 Low Vegetation 86
4 Medium Vegetation 68
5 High Vegetation 41
6 Building 22
7 Low Point (noise) 388297
8 Model Key Point 248262880
9 Water 35
10 Class 10 - see metadata 16
12 Overlap 959161668
13 38
14 37
15 37
16 16
17 778
18 50
19 27
20 48
21 34
22 46
23 24
24 41
25 30
26 38
27 36
28 70
29 53
30 37
31 71

Class Number	Class Name	Points
0	Never Classified	74
1	Unclassified	953350870
2	Ground	712954314
3	Low Vegetation	86
4	Medium Vegetation	68
5	High Vegetation	41
6	Building	22
7	Low Point (noise)	388297
8	Model Key Point	248262880
9	Water	35
10	Class 10 - see metadata	16
12	Overlap	959161668
13		38
14		37
15		37
16		16
17		778
18		50
19		27
20		48
21		34
22		46
23		24
24		41
25		30
26		38
27		36
28		70
29		53
30		37
31		71

Georeferencing Note

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).

Cloud Access

This data is now in an AWS S3 bucket at s3://noaa-nos-coastal-lidar-pds/laz/geoid18/2549.

Meta Info

Tile Index: tileindex.zip (Shapefile)
ma2010_fema_concordriver_index.gpkg (GeoPackage)
Metadata: ma2010_fema_concordriver_metadata.xml
Metadata: ma2010_fema_concordriver_metadata.html
XYZ range table: ma2010_fema_concordriver_minmax.csv
README: 0README.txt (contains similar information to above)
URL List: urllist2549.txt is a list of all the URLs for batch downloading.

Supplemental Info

supplemental/index.html
supplemental/ma2010_fema_concordriver_accuracyreport.pdf
supplemental/ma2010_fema_concordriver_footprint.KMZ
supplemental/ma2011_fema_concordriver_accuracyreport.pdf
supplemental/ma2011_fema_concordriver_footprint.KMZ

Point Clouds

This page is owned by the NOAA Office for Coastal Management and was created by an automated script on Mon Dec 20 16:04:16 EST 2021