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NAME

r.in.nasadem - Creates a DEM from 1 arcsec NASADEM tiles.

KEYWORDS

raster, import, SRTM

SYNOPSIS

r.in.nasadem
r.in.nasadem --help
r.in.nasadem [-z] [version=string] [layer=string] output=name [username=string] [password=string] [url=string] [local=name] [region=xmin,ymin,xmax,ymax] [method=string] [resolution=float] [memory=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-z
Create zero elevation for missing tiles
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog

Parameters:

version=string
NASADEM version
Options: NASADEM_HGT.001
Default: NASADEM_HGT.001
layer=string
NASADEM layer to import
Options: hgt, num, swb
Default: hgt
hgt: Void-filled DEM
num: Number of scenes
swb: Updated SRTM water body data
output=name [required]
Name for output raster map
username=string
Username for authentication
password=string
Password for authentication
url=string
Base URL to fetch NASADEM tiles
Default: https://e4ftl01.cr.usgs.gov/MEASURES
local=name
Local folder with NASADEM tiles
Use local folder instead of URL to retrieve NASADEM tiles
region=xmin,ymin,xmax,ymax
Import subregion only (default is current region)
Format: xmin,ymin,xmax,ymax - usually W,S,E,N
method=string
Resampling method to use for reprojection (required if location projection not longlat)
Options: nearest, bilinear, bicubic, lanczos, bilinear_f, bicubic_f, lanczos_f
Default: bilinear_f
nearest: nearest neighbor
bilinear: bilinear interpolation
bicubic: bicubic interpolation
lanczos: lanczos filter
bilinear_f: bilinear interpolation with fallback
bicubic_f: bicubic interpolation with fallback
lanczos_f: lanczos filter with fallback
resolution=float
Resolution of output raster map (required if location projection not longlat)
memory=integer
Maximum memory to be used (in MB)
Cache size for raster rows
Default: 300

Table of contents

DESCRIPTION

r.in.nasadem imports all NASADEM tiles covering the current region or region extents given with the region option into GRASS and patches the tiles together.

From https://lpdaac.usgs.gov/news/release-nasadem-data-products/:

"NASADEM extends the legacy of the Shuttle Radar Topography Mission (SRTM) by improving the digital elevation model (DEM) height accuracy and data coverage as well as providing additional SRTM radar-related data products. The improvements were achieved by reprocessing the original SRTM radar signal data and telemetry data with updated algorithms and auxiliary data not available at the time of the original SRTM processing."

In total, 14520 NASADEM tiles are available.

r.in.nasadem imports data from NASADEM_HGT.001, or from a local copy of these data provided with the local option.

There are three different layers available in the NASADEM_HGT.001 product: hgt, num, and swb, each of these layers can be imported with r.in.nasadem with the layer option. Importantly, for the NASADEM tiles download a user registration is needed at https://urs.earthdata.nasa.gov/users/new

In the earthdata user profile, two specific applications must be approved in the "My application" tab:

EXAMPLE

Import of NASADEM_HGT.001 covering the current computational region:
# run in LatLong location - Sicily East, Italy
g.region n=39 s=37 w=14 e=16 res=0:00:01 -p

# use own credentials here
r.in.nasadem user="my_nasa_user" password="my_nasa_pw" output=nasadem_sicily_1arc
r.univar nasadem_sicily_1arc
r.in.nasadem example
Figure: Eta volcano (Sicily, Italy) shown in NVIZ

SEE ALSO

r.in.srtm, r.in.srtm.region

The Shuttle Radar Topography Mission homepage at NASA's JPL (see also MEaSUREs Data Product Table - SRTM).

The NASADEM_HGT.001 product page.

REFERENCES

M. Neteler, 2005. SRTM and VMAP0 data in OGR and GRASS. GRASS Newsletter, Vol.3, pp. 2-6, June 2005. ISSN 1614-8746.

AUTHORS

Markus Metz
Reprojection support: Anika Bettge, mundialis

SOURCE CODE

Available at: r.in.nasadem source code (history)


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