RTC Stack Processor

The radiometric terrain correction (RTC) stack processor tool facilitates time-series analysis of such phenomena as flooding events, deforestation, or glacier retreat.

This tool creates a stack from a set of Sentinel-1 RTC products produced on the ASF HyP3 system. It also works for a co-registered set of PALSAR RTC products. In fact, the tool can accept any UTM-projected co-registered set of images.

The stacking tool allows the user to perform sub-setting, resampling, grouping, filtering and culling on the stack. The final products are a stack of processed GeoTIFF and an animated GIF of the stack.

Stack of Sentinel-1 RTC images over the Yukon Flats, Alaska.
The Yukon river flats near Beaver, Alaska. ASF DAAC 2019, contains modified Copernicus Sentinel data 2017-2018, processed by ESA.

Stack Processor Instructions Overview

Input Options

  • Download input files from a HyP3 subscription (if not already downloaded), unzipping files as necessary.
  • Process cloud-optimized images directly from an AWS bucket
  • Read unzipped HyP3 directories or custom files from the command line

Processing Options

  • Group files by timestamp
  • Ascending or descending only
  • Subset images by clipping to:
    • Common overlap
    • Bounding box
    • Shapefile
  • Cull images based on the amount of ‘no data.’
  • Filter images using the Enhanced Lee filter
  • Resample the image to the desired resolution

Post Processing

  • Animation creation
    • Results are scaled to byte using a set dB range
    • Results converted to PNG files
    • HyP3 files annotated with the date
    • Create an animated GIF from PNG files
  • Output frames
    • Clipped groups of processed images are converted to one of these:
      • dB byte
      • dB float
      • Floating point amplitude
      • Floating point power

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