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Purpose

 

A Digital Elevation Model covering the Antarctic area can be imported.

 

Technical Note

 

The RADARSAT Antarctic Mapping Project (RAMP) was initiated in the framework of a collaboration between NASA and CSA. In 1997, RADARSAT was rotated in its orbit so that its SAR antenna looked South towards Antarctica. This allowed high-resolution mapping of the entire continent of Antarctica. More detailed information on this project are available through NSIDC (National Snow and Ice Data Centre).

 

Two products can be imported:

 

Elevations for points in this data set are measured in meters above the WGS84 ellipsoid. This is the product to adopt as input for any SARscape processing.

Elevations for points in this data set are measured in meters above the OSU91A geoid.

 

The two products are available on the following FTP server (anonymous login):

Host Name -> sidads.colorado.edu

Download Path -> pub\DATASETS\RAMP\DEM_V2\200M\BINARY

 

The files to download are marked by the extension ".bin.gz". The downloaded product must be uncompressed before importing it.

 

The product is imported using its native Polar Stereographic (Southern Hemisphere) projection. It is suggested to keep the original cartographic reference system.

 

Input Files

 

Input file

Name of the file to be imported. This file is mandatory.

 

Parameters - Principal Parameters

 

Slope        

By setting this flag, three slope files are created: slope east-west, slope north-south in degree between -90 and 90. The third out is the absolute slope (sqrt(ew^2 +ns^2)) in degree, between 0 and 90 degree.

 

Parameters - Global

 

It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.

 

Parameters - Other Parameters

 

It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.

 

Output Files

 

Output file

Output file name of the extracted Digital Elevation Model. This file is mandatory.

 

_dem        

Imported Digital Elevation Model, with user-defined projection and grid size, and associated header files (.sml, .hdr).

 

_W2E_slope

Easting direction slope image and associated header files (.sml, .hdr).

 

_S2N_slope

Northing direction slope image and associated header files (.sml, .hdr).

 

_slope

Combined slope image and associated header files (.sml, .hdr).

These last three files are generated only if the relevant flag is set.

 

Details specific to the Units of Measure and Nomenclature of the output products can be found in the Data Format section.

 

General Functions

 

Exec

The processing step is executed.

 

Store Batch        

The processing step is stored in the batch list. The Batch Browser button allows to load the batch processing list.

 

Close        

The window will be closed.

 

Help

Specific help document section.

 

 

Specific Function(s)

 

None.

 

References

 

Liu, H., K. Jezek, B. Li, and Z. Zhao. 2001. Radarsat Antarctic Mapping Project digital elevation model version 2. Boulder, CO: National Snow and Ice Data Center. Digital media.