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Please correct me if I'm mistaken, but I assume you are referring to the modified DEM file that is included with the ALOS PALSAR RTC product bundle. This file is a copy of an open-source DEM that was downloaded, modified, and used to perform radiometric terrain correction (RTC) on an ALOS PALSAR gra...

If you are referring to the DEMs included with the ALOS PALSAR RTC products from ASF, it is important to note that they are NOT generated from ALOS PALSAR imagery. They are the DEMs that were used for RTC processing, which were simply mosaicked and clipped from publicly-available DEMs, such as SRTM ...