r.in.srtm.region - GRASS GIS manual

NAME

r.in.srtm.region - Creates a DEM from 3 arcsec SRTM v2.1 or 1 arcsec SRTM v3 tiles.

KEYWORDS

SYNOPSIS

r.in.srtm.region

r.in.srtm.region --help

r.in.srtm.region [-n21z] output=name username=string password=string [url=string] [local=name] [region=xmin,ymin,xmax,ymax] [memory=integer] [method=string] [resolution=float] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-n: Fill null cells
-2: Import SRTM v2 tiles; Default: Import SRTM v3 tiles
-1: Input is a 1-arcsec tile (default: 3-arcsec)
-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:

output=name [required]: Name for output raster map
username=string [required]: Username for authentication
password=string [required]: Password for authentication
url=string: Base URL to fetch SRTM tiles
local=name: Local folder with SRTM tiles; Use local folder instead of URL to retrieve SRTM tiles
region=xmin,ymin,xmax,ymax: Import subregion only (default is current region); Format: xmin,ymin,xmax,ymax - usually W,S,E,N
memory=integer: Memory in MB for interpolation; Default: 300
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; 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)

DESCRIPTION
EXAMPLE
SEE ALSO
REFERENCES
AUTHOR

DESCRIPTION

r.in.srtm.region imports all SRTM tiles covering the current region or region extents given with region into GRASS, patches the tiles together and optionally interpolates holes for SRTM V2.1. The SRTM V003 products are already void-filled.

r.in.srtm.region downloads (SRTM product description)

SRTMGL1 V003 tiles at 1 arc second (about 30 meters) resolution, void-filled from:
https://e4ftl01.cr.usgs.gov/MEASURES/SRTMGL1.003/2000.02.11/
SRTMGL3 V003 tiles at 3 arc seconds (about 90 meters) resolution, void-filled from:
https://e4ftl01.cr.usgs.gov/MEASURES/SRTMGL3.003/2000.02.11/
SRTM V2.1 tiles at 3 arc second (about 90 meters) resolution from: http://dds.cr.usgs.gov/srtm/
or, optionally r.in.srtm.region uses a local folder with previously downloaded SRTM data files if the local option is given.

Importantly, for the SRTM tiles download a user registration is needed at https://urs.earthdata.nasa.gov/users/new

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

"LP DAAC Data Pool" application, and
"Earthdata Search" application.

EXAMPLE

Import of SRTMGL1 V003 (1 arc seconds ~ 30m) 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.srtm.region -1 user="my_nasa_user" password="my_nasa_pw" output=srtm_sicily_1arc memory=2000
r.univar srtm_sicily_1arc