Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991

Create and Process an RTC Stack

The Yukon river flats near Beaver, Alaska. ASF DAAC 2019, contains modified Copernicus Sentinel data 2017-2018, processed by ESA.

Access Tool Access Instructions

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

For installation instructions and to download the code,, please visit our GitHub repo at Select "RTC Time Series Generation..."

Click image for animation. The Bering Glacier in Alaska. Drastic darkening and lightening occur throughout the seasons based upon the wetness of the glacier surface. ASF DAAC 2019, contains modified Copernicus Sentinel data 2018-2019, processed by ESA.

Tool 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 Enhanced Lee filter
  • Resample image to 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 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
Get SAR Data

Get SAR Data

Select and download SAR data online using Vertex.

Use the ASF API for downloading SAR data via a command line.