DownloadSRTMTiles - Download or list SRTM tiles related to a set of images

Download or list SRTM tiles

Detailed description

This application allows selecting the appropriate SRTM tiles that covers a list of images. It builds a list of the required tiles. Two modes are available: the first one download those tiles from the USGS SRTM3 website (http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/), the second one list those tiles in a local directory. In both cases, you need to indicate the directory in which directory tiles will be download or the location of local SRTM files.

Parameters

This section describes in details the parameters available for this application. Table [1] presents a summary of these parameters and the parameters keys to be used in command-line and programming languages. Application key is DownloadSRTMTiles .

[1]	Table: Parameters table for Download or list SRTM tiles related to a set of images.

Parameter Key	Parameter Name	Parameter Type
il	Input images list	Input image list
vl	Input vector data list	Input vector data list
names	Input tile names	String list
tiledir	Tiles directory	Directory
mode	Download/List corresponding SRTM tiles.	Choices
mode download	Download	Choice
mode list	List tiles	Choice
inxml	Load otb application from xml file	XML input parameters file
outxml	Save otb application to xml file	XML output parameters file

• Input images list: List of images on which you want to determine corresponding SRTM tiles.
• Input vector data list: List of vector data files on which you want to determine corresponding SRTM tiles.
• Input tile names: List of SRTM tile names to download. This list is added to the tiles derived from input images or vectors.The names should follow the SRTM tile naming convention, for instance N43E001.
• Tiles directory: Directory where SRTM tiles are stored. In download mode, the zipped archives will be downloaded to this directory. You’ll need to unzip all tile files before using them in your application. In any case, this directory will be inspected to check which tiles are already downloaded.
• Download/List corresponding SRTM tiles. Available choices are:

• Download: Download corresponding tiles on USGE server.
• List tiles: List tiles in an existing local directory.

• Load otb application from xml file: Load otb application from xml file.
• Save otb application to xml file: Save otb application to xml file.

Example

To run this example in command-line, use the following:

otbcli_DownloadSRTMTiles -il QB_Toulouse_Ortho_XS.tif -mode list -tiledir /home/user/srtm_dir/

To run this example from Python, use the following code snippet:

#!/usr/bin/python

# Import the otb applications package
import otbApplication

# The following line creates an instance of the DownloadSRTMTiles application
DownloadSRTMTiles = otbApplication.Registry.CreateApplication("DownloadSRTMTiles")

# The following lines set all the application parameters:
DownloadSRTMTiles.SetParameterStringList("il", ['QB_Toulouse_Ortho_XS.tif'])

DownloadSRTMTiles.SetParameterString("mode","list")

DownloadSRTMTiles.SetParameterString("tiledir", "/home/user/srtm_dir/")

# The following line execute the application
DownloadSRTMTiles.ExecuteAndWriteOutput()

Limitations

None

Authors

This application has been written by OTB-Team.