Welcome to approach’s documentation!

The Alos Pre-PROcessing CHain (a.k.a. approach… sorry) is a repository to aid in the pre-processing of level 1.1 data from ALOS-1 and ALOS-2 with the SNAP graph processing tool.

Backscatter from the L-band ALOS-1 and ALOS-2 RADAR sensors is strongly associated with aboveground woody biomass in African woodlands and savannahs. This repository performs the pre-processing elements for producing similar maps. The gamma0 output geotiffs can be futher calibrated to measure aboveground biomass.

How do I get set up?

This script is written in Python for use in Linux. You will need to have:

• A linux terminal
• Installed the SNAP graph processing tool
• Python, with snappy installed.

For more detailed instructions, see setup page.

Who do I talk to?

sam.bowers@ed.ac.uk

Contents:

• Background
• Setup instructions
  • Requirements
  • Installing SNAP
  • Installing snappy
  • Installing approach
  • Where do I get help?
• Preprocessing ALOS data on the command line
  • Showing help
  • An example run
  • Output
  • Visualising in QGIS
• Mosaicking ALOS data on the command line
  • An example run
  • Output
  • Visualising in QGIS
• Under the bonnet
  • What is going on?
  • What is the processing chain for ALOS-1?
  • What is the processing chain for ALOS-2?
  • What about speckle filtering?
  • How can this be improved?
  • What other options do I have?

Indices and tables

• Index
• Module Index
• Search Page