I NEED 5M RESOLUTION

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negus
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I NEED 5M RESOLUTION

by negus » Fri Mar 31, 2023 10:17 am America/New_York

5M RESOLUTION ASF ALOS PALSAR

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Re: I NEED 5M RESOLUTION

by ASF - bhauer » Wed Apr 05, 2023 12:19 pm America/New_York

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 granule. The height values of the modified DEM differ from the source DEM because an ellipsoid correction was applied before it was used for RTC. These files are not intended to be used in place of a standard DEM product but are included to assist in interpreting/evaluating the RTC products.

The sources of the DEMs downloaded and used for this project vary depending on the location of the PALSAR granule. Details about the DEMs used and the modifications applied are available here:
https://asf.alaska.edu/information/palsar-rtc-dem-information/

Note that the DEM file is resampled to match the pixel spacing of the RTC product, so the pixel spacing does not necessarily reflect the resolution of the source DEM.

General information about the ALOS PALSAR RTC products is available here:
https://asf.alaska.edu/data-sets/derived-data-sets/alos-palsar-rtc/alos-palsar-radiometric-terrain-correction/
Bill Hauer
Alaska Satellite Facility DAAC
User Support Office
uso@asf.alaska.edu

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