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There is a new, 30 meters resolution SRTM DTM coming out. As stated on the NASA JPL official page, The next release is planned for later in 2014, and it is expected to include all of South America plus North America south of the United States. It is incomplete, for now, it has only limited coverage. You can read an article about SRTM coverages here ...


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Answer for others so confused people as I am: To know how to deal with downloaded raw Landsat data - what else in pre-processing do I need? Firstly check their processing level in_MTL.txt file (included in downloaded Landsat image: http://landsat.usgs.gov/Landsat_Processing_Details.php) Processing level = DATA_TYPE L1T - terrain corrected processing. ...


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Have you though of just using the free GDAL tool? http://www.gdal.org/gdaldem.html It can run in windows using OSGEO4W and can ouput .img files. For Imagine 8 it goes something like... From Spatial Modeler: This model is found in the file <.IMAGINE_HOME.>/etc/models/Slope_percent.gmd. From Image Interpreter: Select Topographic Analysis... | Slope.... ...



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