SRTM (NASA)

Author: O.Conrad (c) 2026
Menu: File | Web Services | Global Elevation Data

Description

This tool provides easy-to-use access to the 'NASA Shuttle Radar Topography Mission Global 1 arc second' elevation data (about 30 meter resolution). It uses a local database in the chosen directory which provides the original tiles. If the tiles covering the requested area are not found in this directory the tool tries to download these from the NASA Earthdata server. Note that a valid login for the NASA Earthdata server has to provided for successful downloads, and that an appropriate citation is expected for publications based on these data (NASA JPL 2013)!

References

NASA Shuttle Radar Topography Mission Global 1 arc second V003
User's Guide
NASA JPL (2013): NASA Shuttle Radar Topography Mission Global 1 arc second. [Data set]. NASA Land Processes Distributed Active Archive Center. doi:10.5067/MEASURES/SRTM/SRTMGL1.003

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Grid	grid, input	`GRID`	-	-
Input	Shapes	shapes, input	`SHAPES`	-	-
Output	Grid	data object Grid, output, optional	`RESULT`	-	-
Options	User	text	`USERNAME`	-	Default: user
	Password	text	`PASSWORD`	-	-
	Local Tiles Directory	file path	`TILES`	Download location for tiles. If requested tile is already present download will be skipped.	-
	Delete Archive Files	boolean	`DELARCHIVE`	Do not keep archive files after download	Default: 1
	Extent	choice	`EXTENT`	-	Available Choices: [0] user defined [1] shapes extent [2] grid system extent [3] grid system Default: 0
	Grid System	grid system	`GRID_SYSTEM`	-	-
	West	floating point number	`XMIN`	-	Default: 270360.000000
	East	floating point number	`XMAX`	-	Default: 931320.000000
	South	floating point number	`YMIN`	-	Default: 5225850.000000
	North	floating point number	`YMAX`	-	Default: 6111540.000000
	Columns	integer number [GUI]	`NX`	-	Minimum: 1 Default: 7345
	Rows	integer number [GUI]	`NY`	-	Minimum: 1 Default: 9842
	Buffer	floating point number	`BUFFER`	add buffer (map units) to extent	Minimum: 0.000000 Default: 0.000000
	Cellsize	floating point number	`CELLSIZE`	-	Minimum: 0.000100 Default: 90.000000
	Coordinate System Definition	text [CMD]	`CRS_STRING`	Supported formats comprise PROJ and WKT strings, object codes (e.g. "EPSG:4326").	-

Command Line


Usage: saga_cmd io_webservices 2 [-USERNAME ] [-PASSWORD ] [-RESULT ] [-TILES ] [-DELARCHIVE ] [-EXTENT ] [-GRID ] [-SHAPES ] [-XMIN ] [-XMAX ] [-YMIN ] [-YMAX ] [-BUFFER ] [-CELLSIZE ] [-CRS_STRING ]
  -USERNAME:      User
	text
	Default: user
  -PASSWORD:      Password
	text
  -RESULT:        Grid
	data object Grid, output, optional
  -TILES:         Local Tiles Directory
	file path
  -DELARCHIVE:    Delete Archive Files
	boolean
	Default: 1
  -EXTENT:        Extent
	choice
	Available Choices:
	[0] user defined
	[1] shapes extent
	[2] grid system extent
	[3] grid system
	Default: 0
  -GRID:          Grid
	grid, input
  -SHAPES:        Shapes
	shapes, input
  -XMIN:       West
	floating point number
	Default: 270360.000000
  -XMAX:       East
	floating point number
	Default: 931320.000000
  -YMIN:       South
	floating point number
	Default: 5225850.000000
  -YMAX:       North
	floating point number
	Default: 6111540.000000
  -BUFFER:     Buffer
	floating point number
	Minimum: 0.000000
	Default: 0.000000
  -CELLSIZE:   Cellsize
	floating point number
	Minimum: 0.000100
	Default: 90.000000
  -CRS_STRING:    Coordinate System Definition
	text
[CMD]